Curriculum vitae
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1. |
(a) |
NAME: |
ADEYEMI, Gabriel |
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Oladapo |
(b) |
DATE OF BIRTH: |
4 October, 1954 |
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(c) |
DEPARTMENT: |
Geology |
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(d) |
FACULTY: |
Science |
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(e) |
COLLEGE: |
Not Applicable |
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II. |
(a) |
FIRST ACADEMIC APPOINTMENT: |
1 January, 2001 |
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(b) |
PRESENT POST: |
Professor |
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(c) DATE OF LAST PROMOTION: |
1 October, 2004 |
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(d) DATE LAST CONSIDERED FOR PROMOTION: |
Not applicable |
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III. UNIVERSITY OF IBADAN
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University of Ife (Now Obafemi Awolowo University, Ile-Ife) |
1976-1980 |
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University of Ife (Now Obafemi Awolowo University, Ile-Ife) |
1983-1986 |
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Obafemi Awolowo University, Ile-Ife |
1987-1992 |
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IV. |
ACADEMIC QUALIFICATIONS |
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Bachelor of Science, Geology, University of Ife |
July 1980 |
Master of Science, Applied Geology, University of Ife,
(Engineering Geology/hydrogeology Option) April, 1986
Doctor of Philosophy, Geology, Obafemi Awolowo University,
(Engineering Geology Option) November, 1992
V. PROFESSIONAL QUALIFICATIONS AND DIPLOMAS:
Registered by the Council of Nigerian Mining Engineers and Geoscientists (COMEG) – 2004
VI. SCHOLARSHIP, FELLOWSHIP AND PRIZES: Nil
VII. HONOURS, DISTINCTIONS AND MEMBERSHIP OF LEARNED SOCIETIES
1. Member, Nigerian Mining and Geosciences Society
2. Member, Nigerian Association of Hydrogeologists
3. Member, Science Association of Nigeria
4. Member, Nigerian Association of Petroleum Explorationists (NAPE)
5. Member, Deep Foundations Institute, United States of America
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VIII. |
DETAILS OF TEACHING EXPERIENCE AT UNIVERSITY LEVEL |
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Assistant Lecturer, Department of Earth Sciences, |
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Ogun State University, (Now Olabisi Onabanjo University, (Ago-Iwoye) |
1987-1990 |
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Lecturer Grade II, Department of Earth Sciences, |
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Ogun State University, Ago-Iwoye |
1990-1992 |
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Lecturer Grade 1, Department of Earth Sciences, |
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Ogun State University, Ago-Iwoye |
1992-1996 |
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Senior Lecturer, Department of Earth Sciences, |
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Ogun State University, Ago-Iwoye |
1996-2000 |
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Senior Lecturer, Department of Geology, University of Ibadan |
2001 to 1 October, 2004 |
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Reader, Department of Geology, University of Ibadan |
2004 – date |
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(a) |
Undergraduate Courses Taught |
Unit |
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GEY 284: |
Geological Map Interpretation and Field Mapping |
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3 |
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GEY 361: |
Introduction to Applied Geology |
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2 |
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GEY 384: |
Geological Field Mapping |
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2 |
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GEY 463: |
Engineering Geology |
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2 |
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GEY 484: |
Field Geology of Nigeria |
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2 |
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GEY 486: |
Seminar in Geology |
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2 |
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GEY 488: |
Projects in Geology |
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6 |
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(b) |
Postgraduate Courses Taught |
Unit |
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GEY 752: |
Advanced Engineering Geology |
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2 |
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GEY 753: |
Soil Mechanics |
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2 |
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GEY 754: |
Rock Mechanics |
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2 |
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GEY 755: |
Foundation Systems |
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3 |
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GEY 780: |
Postgraduate Seminar |
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2 |
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GEY 788: |
Research Project |
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6 |
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Total Undergraduate Projects/Seminars supervised at University of Ibadan: |
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Already completed |
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30 |
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In progress |
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03 |
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Postgraduate Project Dissertations and Theses Supervised: |
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Already completed |
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20 M.Sc. Projects |
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2 M.Phil. Dissertation |
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In Progress: |
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6 M.Sc. Projects |
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1 M.Phil. Dissertation |
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7 Ph.D Theses |
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(c) Administrative Responsibilities:
(i) Chairman, Fieldwork Committee - 2002/2003 Session
(ii) Departmental Representative on the Faculty
Research Committee - 2002/2003
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(iii) Acting Head of Department - 1 August 2004 to 31 July,
2006
IX. RESEARCH
Theme:
My research activities are mainly in the field of Engineering Geology, which is the application of knowledge of geological sciences to the solution of Civil Engineering (Earth Work) problems. The methods employed involve determination of geotechnical properties of soils and rocks and relating them to their textural mineralogical and geochemical characteristics.
Crystalline Basement Complex rocks underlie many parts of Southwestern Nigeria. These rocks are overlain directly, or almost so, mostly by reddish brown soils called lateritic soils. The geotechnical properties of the residual soils depend to a large extent on engineering and geological properties of parents rocks.
Geotechnical properties of such soils also depend on other pedogenic factors. The soils have wide utilities both as foundation for structures as well as construction materials. Efforts are thus being made to study important geotechnical properties such as strength, compressibility and permeability of lateritic soils. Such studies have been widely applied in foundation investigations especially for highways, hydrogeology and environmental geology.
The main areas of focus are therefore;
1. Assessment of the influence of soil forming factors on geotechnical properties of lateritic soils.
2. Highways geotechnical properties of lateritic soils
3. Soil stabilization
4. Geotechnical characterization of geomaterials and
5. Environmental Engineering Geology
(a) RESEARCH COMPLETED
Geotechnical Evaluation of Geomaterials
(1) Engineering Geological Evaluation of Clay Deposits in parts of Southwestern Nigeria for Bricks.
(2) Engineering Geological Evaluation of Lateritic soils as construction materials.
Soil Stabilisation
(1) Chemical Stabilization of Lateritic Soils using Cement, Lime and mixture of both.
(2) Mechanical Stabilization of Lateritic soils from Basement Complex terrains of Southwestern Nigeria.
Evaluation of Lateritic Soils as Highway Subgrade Materials
(1) Highways Geotechnical properties of Lateritic soils along Ibadan-Ijebu-Ode Road
(2) Evaluation of Subgrade materials below the flexible pavement along Ibadan – Ile-Ife
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(3) Engineering Geological Evaluation of Subgrade soils along sections of the Lagos-Ibadan highway.
Influence of Soil-Forming (Pedogenic) Factors on Geotechnical Properties of Lateritic Soils
(1) Influence of parent rock factor on geotechnical properties of Lateritic soils
(2) Influence of position in soil profile on geotechnical properties of Lateritic soils
(3) Influence of topographic site on geotechnical properties of Lateritic soils.
Environmental Engineering Geology
(1) Evaluation of some hypothetical locations around Ago-Iwoye and Ijebu-Ode as proposed landfill sites.
(2) Evaluation of some locations along Ijebu-Ode/Ibadan road as landfill sites.
(3) Engineering Geological Evaluation of some locations along Ibadan/Ile-Ife highway as landfill sites.
(4) Influence of disposed wastes on quality of shallow groundwater in parts of Ibadan and Ikire, Southwestern Nigeria.
(b) IN PROGRESS
Geotechnical Evaluation of Geomaterials
(1) Engineering Geological Evaluation of crystalline Basement Complex rocks as construction materials.
(2) Engineering Geological Evaluation of residual Lateritic soils of southwestern Nigeria as construction materials.
Soils Stabilisation
(1) Mechanical stabilization of Lateritic soils of Southwestern Nigeria.
(2) Stabilization of Lateritic soils in Basement Complex terrains with termite – reworked soils.
(3) Stabilization of lateritic soils in Sedimentary terrain of southwestern Nigeria with termite-reworked soils.
(4) Stabilization of lateritic clays with lateritic soils
Environmental Engineering Geology
(1) Engineering Geological Evaluation of some locations in Ajibode, Ibadan as sanitary landfill sites.
(2) Influence of disposed wastes on quality of groundwater in the Ibadan end of the Lagos-Ibadan expressway and Moniya area, Ibadan.
(3) Aspects of Environmental Impacts of exploration and exploitation of Bitumen in some locations near Okitipupa, Southwestern Nigeria.
Foundation Investigations for Structures
(1) Integrated geotechnical and geophysical investigation of soils in parts of Southwestern Nigeria for buildings and dams.
(2) Geotechnical studies of foundation soils in parts of the Niger Delta, Southern Nigeria.
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Engineering geological Mapping
(1) Of undeveloped areas
(2) State capitals in Southwestern Nigeria
(c) DISSERTATION AND THESIS:
(a) Adeyemi, G.O. (1986) Groundwater exploration in parts of Oyo and Ondo States using remote sensing techniques. M.Sc. Dissertation, University of Ife, Ile-Ife.
(b) Adeyemi, G.O. (1992): Highway geotechnical properties of laterised residual soils in the Ajebo-Ishara geological transition zone of southwestern Nigeria. Ph.D. Thesis, Obafemi Awolowo University, Ile-Ife.
List of Publications:
Adeyemi, G. O. Ojo, A. A. and Omidiran, M. O. (1990).Relationship between some Index Properties and Crushing Strengths of three southwestern Nigerian Lateritic clay deposits, Nigerian Journal of Technological Research. Vol. No.2, 111 – 118.
Adeyemi, G. O. (1991). Lineament Nature and Groundwater Accumulation in the Basement Complex of Southwestern Nigeria.Nigerian Journal of Science.Vol. 25, No., 111 – 118.
Adeyemi, G. O. (1994). Clay mineralogy, major elements geochemistry and strength characteristics of three highway subgrade soils in southwestern Nigeria.Bulletin of the International Association of Engineering Geology. No. 50, 5 – 8.
Adeyemi, G. O. (1995). The influence of parent rock factor on some engineering index properties of three residual lateritic soils in southwestern Nigeria Bulletin of the International Association of Engineering Geology. No. 52, 3 – 8.
Adeyemi, G. O. andAkinseli, C.O. (1995). Influence of texture of parent rock on some Engineeringindex properties of some lateritic soils on the Basement Complex rocks in Southwestern Nigeria. Nigerian Journal of Science. Vol. 29, 2078 – 212.
Adeyemi, G.O., Ojo, A.A., Omidiran, M.O. and Akanbi, M.O. (1997). An Engineering Geological evaluation of some Southwestern Nigerian lateritic clay deposits for bricks. Nigerian Journal of Science. Vol. 31, 89 – 99.
Adeyemi, G.O. and Abolurin, S.B. (2000).Strength characteristics of a chemically stabilized lateritic soilfrom kilometer 4, Ile-Ife/Sekona Road, Southwestern Nigeria.Journal of Mining and Geology.Vol. 36, No 1, 113 - 119.
Adeyemi, G. O. and Oyeyemi, F. (2000).Geotechnical basis for failure of sections of the Lagos – Ibadan Expressway, Southwestern Nigeria.Bulletin of Engineering Geology and the Environment. Vol. 59, 39 – 45. Vol. 2, No. 1, 11 – 18.
Adeyemi, G.O., Ojo, O.O. and Patrick, O.J. (2000). Strength characteristics of a lime – stabilized lateritic soil from Ile-Ife, Southwestern Nigeria. Journal of Applied Science and Education. Vol. 2, No. 1, 11 – 18.
Adeyemi, G.O. and Osammor, J (2001).In-situ geotechnical investigation of some soils in Southern Nigeria.Journal of Mining and Geology.Vol. 37, No. 1, 69 – 76.
Adeyemi, G. O. (2002). Geotechnial properties of lateritic soils developed over Quartz-Schist in Isharaarea, Southwestern Nigeria. Journal of Mining and Geology. Vol. 38, No. 1, 65 – 69.
Adeyemi, G. O., Olarewaju, V.O., Akintunde, C.B. and Mesida, O.T. (2003).Mineralogical and geotechnical characteristics of some subgrade soils in a section of the Ibadan/Ile-Ife Expressway, southwestern Nigeria.Journal of Applied Sciences.Vol. 6, No. 2, 3536 – 3547.
Adeyemi, G. O. ,Adesile, A.O. and Obayomi, O. B. (2003). Chemical characteristics of some well waters in Ikire, Southwestern Nigeria. Water resources: Journal of Nigerian Association of Hydrogeologists. Vol. 14, 12 – 18.
Adeyemi, G. O., Owosanya, R. A. and Anokwu, F.C. (2003). Some geotechnical properties of a cement – stabilized granite-gneiss-derived lateritic soil from Ile-Ife, Southwestern Nigeria. Journal of Applied Science and Technology.Faculty of Technology, University of Ibadan, Ibadan, Nigeria. Vol. 3, No. 2, 8 – 12.
Adewoye, O. A. and Adeyemi, G.O. (2004). Geotechnical properties of soils along the Lagos – Ibadan Expressway, Nigeria. USEP: Journal of Research Information in Civil Engineering (RICE), Department of Civil Engineering, University of Ilorin, Kwara State, Nigeria. Vol. 1 No. 1, 1 – 10.
Adeyemi, G. O. and Salami, R. (2004). Some geotechnical properties of two termite-reworked lateritic soils from Ago-Iwoye, Southwestern Nigeria, Mineral Wealth: The quarterly publication of the Scientific Society of the Mineral Wealth Technologists, Athens. Vol. 133, 35 – 41
Odukoya, A.M., Adeyemi, G. O. and Jimoh, A. S. (2004). Aspects of the Environmental Impact Assessment of Limestone quarry site, Sagamu, Southwestern Nigeria. Nigerian Journal of Science.Vol. 38, 81 – 92.
Adeyemi, G. O. and Oyediran, I.A. (2005). Engineering geological evaluation of a proposed landfill site at Aba-kulodi, Near Ibadan, Southwestern Nigeria. Global Journal of Geological Sciences.Vol. 3, No. 1, 25 – 33.
Oloruntola, M.O., Adeyemi, G. O., Adebisi, N. O. and Oduneye, O.C. (2005). Geotechnical properties of cement stabilized soils developed over pegmatite, banded gneiss and porphyroblastic gneiss from Ago-Iwoye, Southwestern Nigeria. Mineral Wealth: The quarterly publication of the Scientific Society of the Mineral Wealth Technologists, Athens. Vol. 135, 25 – 30.
Ariyo, S.O., Adeyemi, G. O. and Ikhane, P.R. (2007).Use of geoelectric sounding for groundwater exploration around Ijebu-Igbo, Southwestern Nigeria.Journal of Applied Sciences.Vol. 67. 575 – 584.
Oloruntola, M. O. Adeyemi, G. O. and Oduneye, O. C. (2008). Comparative study of the influence of cement and lime stabilization on geotechnical properties of lateritic soil derived from pegmatite in Ago-Iwoye, Southwestern Nigeria. Journal of Mining and Geology. Vol. 44, No. 1, 95 – 105.
Oyediran, I. A. Adeyemi, G. O. and Oguntunwase, E. O. (2008). Influence of Termite activities on the geotechnical properties of some lateritic soils in parts of Akungba-Akoko southwestern Nigeria. Mineral Wealth, No. 148, 17 – 24.
Ariyo, S.O., Adeyemi, G. O. and Oyebamiji, A. O. (2009).Electromagnetic VLF Survey for groundwater Development in a contact terrain, a case study of Ishara-Remo, southwestern Nigeria.Journal of Applied Sciences Research.Vol. 5, No. 9, 1239 – 1246.
Adekola, S. A. and Adeyemi, G.O. (2009). Subsoil geotechnical investigation of a hypothetical proposed site at Ajibode, Ibadan Southwestern Nigeria. African Journal of Science and Technology (AJST), Science and Engineering series. Vol. 10, No. 2, 42 – 59.
Ariyo, S.O. and Adeyemi, G.O. (2010): Groundwater Quality. A case study from Ishara Geological zone, Southwestern Nigeria.Mineral Wealth Vol. 154. P 1 – 12.
Idowu, S.O., Adeyemi, G. O. and Dada, S.S. (2010): Engineering Geological Evaluation of Lateritic soils from two contrasting terrains in Southwestern Nigeria. International Journal of Environmental Science Vol. 1, p 37 – 42.
Adebisi, N. and Adeyemi, G.O. (2010) Compressive strength properties of Gneisses in Southwestern Nigeria.Mineral Wealth.Vol. 156, 43 – 50.
Ariyo, S.O. and Adeyemi, G.O. (2011): Integrated Geophysical approach for groundwater Exploration in Hard rock Terrain. A case study from Akaka area of Southwestern Nigeria.International Journal of Advanced Scientific and Technical Research. Issue 1 Vol. 2 p 376-395.
Oyediran, I.A. and Adeyemi G. O. (2011a): Geotechnical investigations of a site in Ajibode, Southwestern Nigeria for Landfill. Ozean Journal of Applied Sciences, Vol. 4, No. 3, 265 – 279.
Oyediran, I. A.and Adeyemi, G. O. (2011b). Use of Geophysical methods in landfill site investigation: A case study of Ibadan, Southwestern Nigeria. New York Science Journal, Vol. 4. No. 1 – 10.
Adebisi, N. O. and Adeyemi, G. O. (2012): Assessment of Compressibility Characteristics of residual laterised soils in Southwestern Nigeria, Science Focus, 17 (2), p. 198 – 208.
Ariyo, S.O. and Adeyemi, G. O. (2012): Geoelectrical Characterization of Aquifers in the Basement Complex/Sedimentary transition zone, Southwestern Nigeria. International Journal of Advanced Scientific Research and Technology. Issue 2 Vol. 1, p 43 – 54.
Owoeye, O.O. and Adeyemi, G. O. (2012): Highway geotechnical properties of lateritic soils from the sedimentary terrain of the Lagos-Ibadan Highway. International Journal of Science and Engineering Vol. 3, Issue 12.
Oyediran, I.A.and Adeyemi, G. O.(2012). Geochemical Assessment of a Proposed Landfill in Ibadan, Southwestern Nigeria.Pacific Journal of Science and Technology, Vol. 13, No 1, 640-651.
Adeyemi, G. O.,Ajai, M.B. and Adedeji, O.A. (2012).Geotechnical properties of some crystalline Basement Complex Rocks from Southwestern Nigeria.Journal of Science Research. Vol. II (1): 112 – 118.
Ariyo, S.O. and Adeyemi, G.O. (2013), Significance of geology and geophysical investigations in groundwater prospecting: a case study from hard rock terrain of Southwestern Nigeria. Journal of Environmental Science and Water Resources.Vol. 2 (10) pp354 – 359.
Adeyemi, G. O., Akinmosin A., Aladesanmi, A.O. and Badmus, O.G. (2013).Geophysical and sedimentological characterization of a tar sand rich area in Southwestern Nigeria.Journal of environment and Earth Science.Vol. 3, No 14 pp 71 – 83
Adebisi, N, O., Adeyemi, G. O., Oluwafemi, O.S. and Songca, S.P. (2013). Important properties of clay content of lateritic soils for engineering projects. Journal of Geography and Geology. Vol. 5, No. 2, pp 99 – 115.
Adeyemi, G.O. and Afolagboye, L.O. (2013): Mechanical Stabilization of Migmatite-Gneiss derived interitic soil from south-western Nigeria EJGE. Vol. 18, pp. 1847 – 1858.
Adeyemi, G.O.,Afolagboye, L.O. and Bolaji, C.A. (2013); Chemical stabilization of Quartz Schist derived from soil ErijiyanEkiti, Southwestern Nigeria. Australian Journal of Basic and Applied Sciences Vol. 7 (2), pp. 63 – 69.
Akinlabi, I.A. and Adeyemi, G.O. (2014); Determination of Empirical relationship between geological and geotechnical parameters at the site of a proposed Earthdom.Ife Journal of Science, Vol. 16(3),pp. 437 – 445.
Adeyemi, G.O., Afolagboye, L.O. and Ezenwafor, C.O. (2014).Engineering Geological Evaluation of some soils in Ozubulu, near Onitsha, South-East Nigeria for use as Liners in Waste Disposal Landmill, Journal of Mining and Geology, Vol. 50 (2),pp. 109 – 118.
Omitogun, A.A., Banjo, I.O. and Adeyemi, G.O. (2014).Geology Appraisal of the Kaolinitic Clay at Odo-Lewu, Ijebu-Ode-Epe Road, Southwestern Nigeria.Journal of Mining and Geology, Vol. 50(2) pp. 147 – 158.
Adeyemi, G.O. and Dairo, V.A. (2015). Subsurface Models of a Bitumen-rich Area Near Ode-Irele, Southwestern Nigeria. Journal of Applied Geology and Geophysics, Vol. 3, Issue 4, 1 – 7.
Chapter in Book:
Ojo, J.S. and Adeyemi, G. O. (2003). Opportunities for ventures is construction materials. In prospects for investments in mineral resources of Southwestern Nigeria.Edited by A . A. Elueze. Nigerian Mining and Geosciences Society. 47 – 54.
Article in Refereed Conference Proceedings:
Ariyo, S.O. and Adeyemi, G. O. (2004): Geophysical Survey of groundwater potentials in Iware area of Southwestern Nigeria. Bulletin of Science Association of Nigeria 25: 9 – 16.
MY BEST TEN PUBLICATIONS
1. Adeyemi, G.O. (1994) Clay mineralogy, major elements geochemistry and strengthcharacteristics of three highway subgrade soils in Southwestern Nigeria. Bulletin of the International Association of Engineering Geology. No. 50, 5-8 France.
Abstract
The clay mineralogical assemblage, major elements geochemistry and strength characteristics in terms of the California Bearing Ratio (CBR) of three genetically different residual soils in Southwestern Nigeria were investigated. The study revealed a fairly strong negative correlation of -0.58 between the amount of kaolinite and the silica-sesquioxides of iron and aluminium ratio. It also showed a weak positive correlation of 0.004 between the amount of kaolinite and ferric oxide. The amount of ferric oxide and kaolinite showed positive correlation of 0.24 and 0.29 respectively with the strength (measured in term of CBR) of the studied soils.
The study has stressed the relevance of a knowledge of geological characteristics prior to a rational understanding of some geotechnical properties of residual soils.
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2. Adeyemi, G.O., Ojo A.A., Omidiran, M.O. and Akanbi, M.O. (1997) An EngineeringGeological evaluation of some Southwestern Nigerian lateritic clay deposits for Bricks. Nigerian Journal of Science. Vol. 31, 89-99 (Nigeria).
Abstract
Biotite schist, Amphibolite schist and migmatite gneiss-derived lateritic clays of Ipetumodu, Ilesha and Ago-Iwoye respectively together with the transported clay of Ikogosi-Ekiti were evaluated, as brick materials. The results of some classification tests have provided a useful link between the tests and the results of unconfined compression test carried out after the firing of the materials. The degree of laterization (degree of sesquioxide coatings) correlates positively with the crushing strengths of fired bricks when other factors of production are kept constant. The compressive strengths of the adequately laterised clays of Ipetumodu, Ilesha and Ago-Iwoye are close to the value quoted for the “load bearing bricks class 1”. In the absence of sophisticated equipment for evaluating lateritic clays for bricks the use of classification test is hereby recommended.
3. Adeyemi, G.O. and Abolurin, S.B. (2000). Strength characteristics of a chemically stabilizedlateritic soil from kilometer 4, Ile-Ife/Sekona Road, Southwestern Nigeria. Journal of Mining and Geology, Vol. 36 No. 1, 113-119 (Nigeria)
Abstract
A granite gneiss-derived lateritic soil taken from around kilometer 4 along Ile-Ife/Sekona road in southwestern Nigeria was investigated. The studies focused on the determination of the unconfined compressive strengths of samples stabilized with cement, lime and some mixtures of both respectively. This was with a view to determining the cheapest and best method of chemical stabilization of the lateritic soil. The methods used, were essentially those prescribed in the British Standard 1377, with some necessary modifications. The tested soil samples were compacted at the optimum moisture content of the West African level.
The soil was found to contain about 40% of fine fraction with medium plasticity. The investigation has shown that the cement stabilized samples exhibited the highest cured strengths of about 332KN/m2, while lime-stabilised samples gave the least strength of about 281KN/m2. The work has also revealed that using the amount of cement or lime beyond 10%, did not produce any significant increase in the strength of the soil.
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4. Adeyemi G.O. and Osammor, J. (2001). In-situ geotechnical investigation of some soils inSouthern Nigeria. Journal of Mining and Geology Vol. 37, No. 1, 69-76 (Nigeria)
Abstract
Standard penetration tests were carried on soils in twenty boreholes drilled around Lagos and Port Harcourt in southern Nigeria. The results of the tests were compared with about two thousand cone resistance and friction ratios obtained from cone penetration tests. This was with a view to establishing some quantitative correlations, if any, between standard penetration and penetrometer data. Each cone penetration test was performed at a distance of 1.50 metres from adjacent borehole.
Correlation coefficients of 0.85 and 0.64 were established between the cone resistance and standard penetration test (S.P.T.) N-values (blows per 300mm) on the Lagos and Port Harcourt soils respectively. Linear regression equations were also established for the soils in the two areas. All the soils encountered during the penetration tests were also found to have characteristic friction ratios (the ratios of the sleeve to cone resistance). For instance sandy gravels and sands were found to have the lowest friction ratios of 0.11 and 1.20 respectively while clayey peat and peaty clays had the highest ratios of 13.00 and 16.75 respectively. Soils such as sands, silts, clays and mixtures of the soils had intermediate friction ratios.
5. Adeyemi, G.O., Adesile, A.O. and Obayomi, O.B. (2003). Chemical characteristics of somewell waters in Ikire, Southwestern Nigeria. Water Resources: Journal of Nigerian Association of Hydrogeologists. Vol. 14, 12-18 (Nigeria)
Abstract
Chemical analysis of the water samples from ten wells in Ikire, southwestern Nigeria was done with a view to determining the potability or otherwise of the well waters. It was also meant to determine the probable source(s) of pollution of the groundwater. Most of the waters are potable since the concentration of ions in majority of the samples are below the maximum permissible levels indicated in the World Health Organization (WHO) standards.
Correlation coefficients of -0.541, -0.113 and -0.252 were established between the concentrations of nitrate on the one hand and the heights of wells above ground level, depths to water table and depths of wells on the other respectively. The coefficients indicate that the degree of pollution of groundwater in the study area decreases slightly with depth. It also implies that the pollution is mostly from, or near, the surface. Statistical treatment of the concentrations of ions and the pH indicates that the pH is the parameter that is least affected while the concentration of total iron shows the highest variability. Comparison of the pH and concentration of ions in two closely spaced wells underlain by the same rock type reveals a fairly strong influence of geology on the pH and the ions (except on those of total iron and nitrate). The Piper diagram also confirmed the fairly strong influence of the underlying rock on the chemical composition of the water samples.
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6. Adeyemi, G.O. (2003). The influence of compaction on some geotechnical properties of aMigmatite-gneiss-derived lateritic soil from Southwestern Nigeria. Mineral wealth: The quarterly publication of the scientific society of the Mineral Wealth Technologists Athens Vol. 128, 7-12 (Greece)
Abstract
Some geotechnical properties often employed in the evaluation of highway sub-base ad sub-grade soils were investigated for a migmatite-gneiss-derived lateritic soil taken from Ajebo in Southwest Nigeria. The soil samples were compacted at both the West African and the modified American Association of State Highways and Transportation Officials (AASHTO) levels in order to determine the influence of the compaction levels on some basic geotechnical properties of the soil. The results of the geochemical analyses show that the soil is highly laterised while the determined clay mineralogical composition qualifies it as a good road construction material. No significant difference was noticed between the amounts of degradation of the grain of the soils compacted at the optimum moisture content of the West African and modified AASHTO levels. Comparison of the amounts of fines in soil compacted either at the West African or the modified AASHTO level with those of the uncompacted samples shows that the soil is not likely to suffer significant degradation of grains if subjected to axle load on highways. The determined engineering properties such as the maximum dry density, optimum moisture content, California bearing ratio and the unconfined compressive strengths of the soil samples compacted at the modified AASHTO level were higher than those of the samples compacted at the West African level. The studied soil is thus not overcompacted at the modified AASHTO level, the level which has often been adjudged rather high for the compaction of lateritic soils.
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7. Adeyemi, G.O., Owosanya, R.A. and Anokwu, F.C. (2003). Some geotechnical properties ofa cement-stabilized granite-gneiss-derived lateritic soil from Ile-Ife, Southwestern Nigeria. Journal of Applied Science and Technology, Faculty of Technology, University of Ibadan, Ibadan, Nigeria. Vol. 3, No. 2, 8-12 (Nigeria)
Abstract
Samples of granite-gneiss derived lateritic soil from Ile-Ife, Southwestern Nigeria were stabilized with between 0 and 20% by weight of cement. This was with a view to determining the influence of cement on some engineering properties of the soil.
Strong negative correlations of -0.97 and -0.96 were established between the percentage cement and the linear shrinkage and the plasticity index respectively. Positive correlations of 0.22 and 0.89 were established between the maximum Dry Density and the percentage cement of the samples compacted at the West African and Modified American Association of State Highways and Transportation Officials (AASHTO) levels respectively. Negative correlations of -0.49 and -0.79 were found between the optimum moisture content and the percentage cement of the samples compacted at the West African and modified AASHTO levels respectively.
The influence of cement on the compaction characteristic of the soil thus increases with the energy of compaction. The influence of cement stabilization on the unconfined compressive strengths of the soil was found to be strong upon compaction at both the West African and the modified AASHTO levels. However, soil samples compacted at the modified AASHTO level without adding cement exhibited much higher strengths than those stabilized with cement and compacted at the West African level.
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8. Adeyemi, G.O. and Oyediran, I.A. 2005: Engineering geological evaluation of a proposedlandfill site at Aba-Kulodi, near Ibadan, Southwestern Nigeria. Global Journal of Geological Sciences. Vol. 3, No. 1, 25-33 (Nigeria)
Abstract
Evaluation of a location at Aba-Kulodi adjacent to kilometer 8 along the Ibadan/Ile-Ife expressway, Southwestern Nigeria was carried out to determine its suitability or otherwise as a landfill site.
Two Vertical Electrical Soundings (VES) 30.00m apart were executed to obtain subsurface information on depth to bedrock and possibly the water table. Disturbed and undisturbed soil samples were collected from each of the two trial pits established at vertical interval of 0.50m up to a depth of 3.00m. the disturbed samples were subjected to grain size distribution and consistency limits tests while consolidation and permeability tests were carried out on undisturbed samples.
The VES results revealed 3 geo-electric layers with depths to bedrock of between 14.30m and 17.60m at VES 1 and VES 2 respectively. The depths to water table measured from an existing nearby well were 8.10m and 7.00m during the dry and rainy seasons respectively, suggesting that the water table lies within the second geo-electric layer. The soil samples taken from the depth of 3.00m in the two pits are generally well-graded non-plastic sandy clayey silt, a possible indication of no compressibility. The coefficients of permeability obtained for samples from pits 1 and 2 range from 1.85 x 10-4mm/s to 3.91 x 10-6mm/s and 1.91 x 104mm/s to 2.91 x 10-6mm/s respectively. The coefficient of permeability obtained for samples taken from the 3.00m depth in the two pits are significantly higher than the minimum value of 10-6mm/s recommended for soil that should form the base of landfills. The coefficient of volume compressibility at the sampling pits 1 and 2 range from 1.83 to 7.69x10-3 m2/KN but generally increases with applied pressure (31.2 – 498.9 KN/m2) and decrease with depth (0.5 to 3.0m). Statistical treatment of the values of the coefficient of compressibility of soil samples from the depth of 3.0mm in the two test pits shows no significant variation, an indication that there is no likelihood of differential settlement if the site is used for disposal of solid wastes. If in-situ compaction and lining are done, the location can be used as a landfill site.
KEYWORDS: Landfill, Plasticity, Compressibility, Permeability, Compaction.
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9. Adeyemi, G.O. and Wahab, K.A. (2008). Variability in the geotechnical properties of alateritic soil from southwestern Nigeria. Journal of International Association for Engineering Geology and the Environment, Vol. 67, pp 579-584. (Germany)
Abstract
Four bulk soil samples of lateritic soil from the subgrade of the stable flexible highway pavement at Awosun village, near Ile-Ife, Nigeria, were investigated to determine the variation in geotechnical properties within a horizontal distance of 39m. the California bearing ratio and uniaxial compressive strength were found to vary significantly over this short length. The importance of detailed and thorough sampling of lateritic soils is emphasized for proper evaluation of highway subgrade soils.
10. Adeyemi, G.O., Eghomwanre and Folorunso, A.J. (2008). Engineering geological evaluationof samples of banded gneiss around Ibadan, Southwestern Nigeria. Mineral wealth. Vol. 146, pp. 51-56 (Greece)
Abstract
Samples of banded gneiss from three existing quarry sites around Ibadan, southwestern Nigeria were studied petrographically and geotechnically. This was done in order to examine the suitability of these rocks as construction materials, to determine the extent to which the studied properties vary from location to location as well as the possible relationships between paired parameters.
All the geotechnical tests were carried out by following the procedures stipulated in American Society for testing and materials and International Society of Rock Mechanics.
Petrographic studies confirm that the examined rocks possess foliation and mineralogy typical of banded gneisses. The determined geotechnical properties indicate that the rocks are good for many construction purposes. Most of the determined geotechnical properties do not vary appreciably from location to location. Mathematical relationships and correlation coefficients that can permit estimation of one parameter from another were established. Such equations are:
AIV = 24.962 ACV = 24.261 AIV = 0.820
WAC + 16.589 WAC + 12.002 ACV + 7.884
Where AIV, WAC and ACV are aggregate impact value, water absorption capacity and aggregate crushing value respectively. The established correlations coefficients are 0.81, 0.92 and 0.70 respectively.
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Names and Addresses of three (3) Referees:
1. Prof. A. IdowuOlayinka
Vice Chancellor,
University of Ibadan,
Ibadan.
2. Prof. Ebenezer A. Meshida
(Engineering Geologist)
Department of Civil Engineering,
AfeBabalola University,
Ado – Ekiti.
3. Prof. Bankole D. Ako
Retired Professor,
Department of Geology,
ObafemiAwolowoUniversity,
Ile-Ife.