GEOTECHNICAL CHARACTERIZATION AND FOUNDATION SUITABILITY ASSESSMENT:CASE STUDY OF GANDU, LAFIA, NORTH-CENTRAL NIGERIA
DOI:
https://doi.org/10.62050/fjst2025.v10n1.706Keywords:
Foundation Support,, Atterberg Limit, , Particle size distribution, Bearing capacityAbstract
This study presents an integrated geotechnical characterization of subsurface soils in Gandu, Lafia, north-central Nigeria, to evaluate their suitability for foundation support. Laboratory analysis (particle size distribution (PSD) and Atterberg limits) and in-situ test (standard penetration test (SPT)) were conducted on five (5) test pits (PT1-PT5). The PSD results show that the soils are predominantly fine-grained, with coefficients of uniformity (≈ 2.7–2.9) and curvature (≈ 0.8–0.9) suggesting uniformly graded fine soils and poor gradation. Atterberg limits analysis exhibited Liquid Limit (LL) of 28.7 – 35.0 %, Plastic Limit (PL) of 12.9 –24.8 %, and resultant plasticity indices (PI) of 7.7 – 22.1 %. Casagrande plasticity chart classification placed PT1 within the CL zone (clay of low plasticity) and PT2–PT5 in the ML–CL region (silty clay or clayey silt). The SPT N-values indicate an increase in stiffness with depth, signifying the effect of natural consolidation and overburden pressure. Soils with high PI exhibited lower penetration resistance, thereby establishing a clear relationship between plasticity and strength. Strong agreement was observed among PSD, Atterberg limits, and SPT results, which confirms the suitability of the combined index and in-situ testing for soil characterization and preliminary engineering assessment. Overall, the subsurface soils are characterized by moderate strength, low permeability, and moderate compressibility, making them suitable for lightly loaded structures with a well-designed foundation. However, if high-rise or heavier structures are desired, ground improvement or deep foundation systems may be required.
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Adekeye, A. M., Olofinyo, O. O. and Olamide Ale, T. (2021). Engineering properties and strength evaluation of subsoil in Ede North, Southwestern Nigeria: Its competence for foundation purposes. Engineering Heritage Journal, 5(2), 58–64. https://doi.org/10.26480/gwk.02.2021.58.64
Adewuyi O, I. and Philips O. F. (2019). Integrated geophysical and geotechnical methods for pre-foundation investigations. J. of Geol. & Geophy, 08(01). https://doi.org/10.4172/2381-8719.1000453
Akintorinwa, O. J. and Adeusi, F. A. (2009). Integration of geophysical and geotechnical investigations for a proposed lecture room complex at the Federal University of Technology, Akure, SW, Nigeria. Ozean Journal of Applied Sciences, January 2009.
Arthur, E., Rehman, H. U., Tuller, M., Pouladi, N. and Nørgaard, T. (2021). Geoderma estimating Atterberg limits of soils from hygroscopic water content. Geoderma, 381, 114698. https://doi.org/10.1016/j.geoderma.2020.114698
Bery, A. A. and Saad, R. (2012). Correlation of seismic P-wave velocities with engineering parameters (N value and rock quality) for tropical environmental study. Int. J. of Geosci., 03(04), 749–757. https://doi.org/10.4236/ijg.2012.34075
Briaud, J.-L. (2013). Geotechnical Engineering: Unsaturated and Saturated Soils. John Wiley & Sons Ltd.
Briaud, J.-L. (2023). Geotechnical Engineering: Unsaturated and Saturated Soils. John Wiley & Sons, Inc., Hoboken.
Budhu, M. (2015). Soil Mechanics and Foundations (3rd ed). John Wiley & Sons Ltd.
Das, B. M. and Sobhan, K. (2018). Principles of Geotechnical Engineering (9th ed). Cengage Learning.
Faiz, M., Zaki, M., Ashraf, M., Ismail, M., Govindasamy, D. and Zainalabidin, M. H. (2019). Correlation between PMT and SPT results for Kenny Hill Formation. Bulletin of the Geological Society of Malaysia, 68, 141–146.
Ishola, K. S., Amu, B. D. and Adeoti, L. (2022). Evaluation of near-surface conditions for engineering site characterization using geophysical and geotechnical methods in Lagos, Southwestern Nigeria. NRIAG Journal of Astronomy and Geophysics, 11(1), 237–256. https://doi.org/10.1080/20909977.2022.2075160
Islam, I., Ahmed, W., Rashid, M. U., Orakzai, A. U. and Ditta, A. (2020). Geophysical and geotechnical characterization of shallow subsurface soil: a case study of University of Peshawar and surrounding areas. Arabian Journal of Geosciences, 13(18). https://doi.org/10.1007/s12517-020-05947-x
James, L. (2024). Numerical & Experimental Investigations into Particle Size Distribution & Variability Effects on Soil Behaviour using Discrete Element Modelling and Grading Entropy Concepts A thesis submitted in partial fulfilment of the requirements of Edinburgh Napier (Issue August). Edinburgh Napier University.
Kelly, B. C. O. (2021). Review of recent developments and understanding of Atterberg limits determinations. Geotechnics, 1(1), 59–75.
Lollo, L. C. (2016). Geotechnical evaluation of foundation soils for a building (case study of a site in Jimma City, Southwestern Ethiopia). J. of Env. and Earth Sci., 6(3), 95–98. www.iiste.org
Magar, J., Kudtarkar, A., Pachpohe, J. and Nagargoje, P. (2020). Study and analysis of types of foundation and design construction. Int. Res. J. of Engr. and Techn., 7(8), 3301–3307. https://doi.org/10.5281/zenodo.3995061
Mohammed, M. A., Saad, R., Ismail, N. A., Muhammad, S. B., Taib, A. and Saidin, M. (2019). Subsurface soil evaluation using seismic refraction tomography and standard penetration test at Bukit Bunuh Impact Crater Area. Natural and Engineering Sciences, 4(1), 1–10. https://doi.org/10.28978/nesciences.522158
Mohammed, M. A., Saad, R., Ismail, N. A., Muhammad, S. B., Yusoh, R. and Mokhtar, S. (2020). Determination of soil moisture content at bukit bunuh meteorite impacted area using resistivity method and laboratory test. Journal of the Earth and Space Physics, 45(4), 77–87. https://doi.org/10.22059/jesphys.2019.266387.1007041
Oyedele, K. F. and Oladele, S. (2015). Application of geophysical and geotechnical measurements in the pridiction of sub-surface geology for foundation purpose. Development J. of Sci. and Techn. Res. (DJOSTER), 4(2), 1–12.
Pizzati, M., Mantovani, L., Lisotti, A., Storti, F. and Balsamo, F. (2023). Particle size distributions in earth sciences: A review of techniques and a new procedure to match 2D and 3D analyses. EGUsphere, 26(36).
Polidori, E. (2007). Relationship between the Atterberg limits and clay content. Soils and Foundations, 47(5), 887–896.
Skemton, A. W. (1986). Standard penetration test procedures and the effects in sands of overburden pressure, relative density, particle size, ageing and overconsolidation. Geotechnique, 36(3), 425–447.
Zhang, H., Wang, C., Chen, Z., Kang, Q., Xu, X. and Gao, T. (2022). Performance comparison of different particle size distribution models in the prediction of soil particle size characteristics. Land, 11(11), 2068.
Zhou, B., Lu, N. and Asce, F. (2021). Correlation between atterberg limits and soil adsorptive water. J. of Geotech. and Geoenv. Engr, 147(2), 1–13. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002463
Zhou, C., Ma, Y., Tang, C. and Chen, W. (2021). Review of recent developments and understanding of Atterberg limits determinations. Geotechnics, 1(1), 59–75.
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