CURRICULUM VITAE

1. (a) NAME: ADEYEMI, Gabriel

Oladapo (b) DATE OF BIRTH: 4 October, 1954

(c) DEPARTMENT: Geology

(d) FACULTY: Science

(e) COLLEGE: Not Applicable

II. (a) FIRST ACADEMIC APPOINTMENT: 1 January, 2001

(b) PRESENT POST: Professor

(c) DATE OF LAST PROMOTION: 1 October, 2004

(d) DATE LAST CONSIDERED FOR PROMOTION: Not applicable

III. UNIVERSITY OF IBADAN University of Ife (Now Obafemi Awolowo University, Ile-Ife) 1976-1980 University of Ife (Now Obafemi Awolowo University, Ile-Ife) 1983-1986

Obafemi Awolowo University, Ile-Ife 1987-1992

IV. ACADEMIC QUALIFICATIONS

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 VIII. DETAILS OF TEACHING EXPERIENCE AT UNIVERSITY LEVEL

Assistant Lecturer, Department of Earth Sciences,

Ogun State University, (Now Olabisi Onabanjo University, (Ago-Iwoye) 1987-1990 1

Lecturer Grade II, Department of Earth Sciences,

Ogun State University, Ago-Iwoye 1990-1992

Lecturer Grade 1, Department of Earth Sciences,

Ogun State University, Ago-Iwoye 1992-1996

Senior Lecturer, Department of Earth Sciences,

Ogun State University, Ago-Iwoye 1996-2000

Senior Lecturer, Department of Geology, University of Ibadan 2001 to 1 October, 2004

Reader, Department of Geology, University of Ibadan 2004 – date

(a) Undergraduate Courses Taught Unit

GEY 284: Geological Map Interpretation and Field Mapping - 3 GEY 361: Introduction to Applied Geology - 2 GEY 384: Geological Field Mapping - 2 GEY 463: Engineering Geology - 2 GEY 484: Field Geology of Nigeria - 2 GEY 486: Seminar in Geology - 2

GEY 488: Projects in Geology - 6

(b) Postgraduate Courses Taught Unit

GEY 752: Advanced Engineering Geology - 2 GEY 753: Soil Mechanics - 2 GEY 754: Rock Mechanics - 2 GEY 755: Foundation Systems - 3 GEY 780: Postgraduate Seminar - 2

GEY 788: Research Project - 6

Total Undergraduate Projects/Seminars supervised at University of Ibadan:

Already completed - 30

In progress - 03

Postgraduate Project Dissertations and Theses Supervised:

Already completed - 20 M.Sc. Projects 2 M.Phil. Dissertation In Progress: - 6 M.Sc. Projects 1 M.Phil. Dissertation 7 Ph.D Theses (c) Administrative Responsibilities:

(i) Chairman, Fieldwork Committee - 2002/2003 Session (ii) Departmental Representative on the Faculty

Research Committee - 2002/2003 2

(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

3

(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. 4

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 strength

characteristics 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. 5

2. 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 (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

stabilized lateritic 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.

6

4. 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 (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 some well 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. 7

6. Adeyemi, G.O. (2003). The influence of compaction on some geotechnical

properties of a Migmatite-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.

8

7. 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 (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. 9

8. 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 (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.

10

9. Adeyemi, G.O. and Wahab, K.A. (2008). Variability in the geotechnical properties of

a lateritic 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

evaluation of 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.

Hobbies: Jogging, Music, Watching of Soccer.

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.

11