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A Geotechnical Investigation on the Structural Failures of Building Projects in Parts of Awka, Southeastern Nigeria
Twelve samples of shale from different locations within the Imo Shale Formation in the Awka area (southeastern Nigeria) have been assessed to evaluate the impact of the shale formation on some geotechnical problems experienced by constructed projects in the area. Results indicate that shale samples from the formation have Atterberg limits that might be considered moderate to high; while liquid limit (LL) ranged from 32 - 78, the plasticity index (PI) ranged from 11 - 32. These relatively high LL and PI suggest presence of expansive clays, some swelling of the shale on moisture influx and high compressibility. Natural moisture content (with mean value of 17%) was also significantly high. Despite indicating fair stability as fills (Maximum dry density and soaked California bearing ratio have mean values of 1.85 mg/m3 and 42%, respectively), the formation is likely to have low shear strength, as suggested by its low values of strength parameters (mean value of angle of internal friction is 22°, while mean cohesion is 21 kN/m3). Geotechnical behaviours of the Imo Shale also give indications that the shale failed some relevant material specifications for general engineering purposes and, thus, was significantly responsible for structural failures and foundation problems of buildings that are prevalent in some parts of Awka area.
Imo Shale, Nigeria, Building Projects, Geotechnical Analysis, Structural Failures, Soil
- Aghamelu OP and Okogbue CO (2011) Geotechnical assessment of road failures in the Abakaliki area, southeastern Nigeria. Intl. J. Civil & Environ. Engg. 11 (2). 12-24.
- Aghamelu OP, Nnabo PN and Ezeh HN (2011) Geotechnical and environmental problems related to shales in the Abakaliki area, southeastern Nigeria. Afr. J. Environ. Sci. & Technol. 5 (2), 80-88.
- Akroyd TN (1957) Laboratory testing in soil engineering. Soil Mechanics Ltd., London. pp: 233.
- Bailey MJ (1976) Degradation and other parameters related to the use of the shale in compacted embankments. Joint Highway Research Project No. 23, Purdue Univ. & Indiana State Highway Commission. pp: 209.
- BSI 1377 (1990) Methods of testing soils for civil engineering purposes. British Standards Institution, London.
- Coduto DP (1999) Geotechnical engineering, principles and practices. Prentice-Hall, New Jersey. pp: 759.
- Ezeribe IE (1994) The characterization of some Nigeria shales relative to their engineering uses. MSc Thesis, Univ. of Nigeria, Nsukka.
- Kogbe CA (1989) The Cretaceous and Paleogene sediments of southern Nigeria. In: Geology of Nigeria. Kogbe CA (ed.), Rock View, Jos. pp: 325-334.
- Krynine DP and Judd WR (1957) Principles of engineering geology and geotechnics. McGraw-Hill, NY. pp: 730.
- Lambe TW (1951) Soil testing for engineers. Wiley, NY. pp: 165.
- Mannering FL and Kilareski NP (1998) Principles of highway engineering and traffic analysis. 2nd ed, Wiley, NY. pp: 340.
- Murat RC (1972) Stratigraphy and paleogeography of the Cretaceous and lower Tertiary in Southern Nigeria. In: Dessauvagie TFJ & Whiteman AJ (Eds.) Proc. of the Conf. on African Geology held at Ibadan, Nigeria. pp: 251- 266.
- Nwachukwu SO (1972) The tectonic evolution of the southern portion of the Benue Trough, Nigeria. Geol. Mag. 109, 411-419.
- Okagbue CO (1989) Geotechnical and environmental problems of the Niger Delta. Bull. Assoc. Eng. Geol. 27, 119-126.
- Okeke CO (2005) Shales; their classifications and importance to the petroleum industry. PhD Seminar/Special Paper in Engineering Geology and Rock Mechanics. Univ. of Nigeria, Nsukka. pp: 134.
- Okogbue CO and Aghamelu OP (2010) Comparison of the geotechnical properties of crushed shales from Southeastern Nigeria. Bull. Eng. Geol. Environ. 69 (4), 587-597.
- Punmia BC Jain AK Jain AK (2005) Soil mechanics and foundations. 16th ed. Laxmi, New Delhi.
- Reidenouer DR (1970) Shale suitability. Phase II: Pennsylvania Department of Transportation, Bureau of Materials, Testing and Research. Interim Report, No. 1. Dec. pp: 198.
- Reyment RA (1965) Aspects of geology of Nigeria. Ibadan University Press, Ibadan. pp: 145.
- Seed HB and Woodward RJ (1964) Fundamental aspects of the Atterberg limits. J. Soil Mech. Found. Div., Proceedings of ASCE, 90, SM6. pp:75.
- Short KC and Stauble AJ (1967) Outline of geology of the Niger Delta. Bull. AAPG. 5(5), 761-779.
- Simpson A (1955) The Nigerian coalfield - the geology of parts of Onitsha, Owerri and Benue provinces. Geol. Surv. Nigeria Bull. No. 24, pp: 85.
- Sowers GF (1963) Strength testing of soils; laboratory shear testing of soils. ASTM Special Technical Publication 361, American Society for Testing and Materials, Philadelphia.
- Sowers GB and Sowers GF (1970) Introductory soil mechanics and foundations. Macmillan, NY. pp: 556.
- Underwood LB (1967) Classification and identification of shales. J. Soil Mech. Found. Div. ASCE, 93(11), 97- 116.
- Wignall A, Kendrick PS, Ancill R and Capson M (1999) Roadwork; theory and practice. 4th ed. Butterworth-Heinemann, Oxford. pp: 309.
- Wilson RC (1925) The geology of the western railway section 1, Iddo to Okuku. Geol. Surv. Nigeria Bull. No. 2, pp: 63.
- Wilson RC and Bain ADN (1928) The Nigerian coalfield, section 2, parts of Onitsha and Owerri province. Geol.Surv. Nigeria Bull. No.12, pp: 54.
- Yoder EJ (1959) Principles of pavement designs. John Wiley and Sons, NY.
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