Authors : Omonaye Joseph; Olaleye B. M.; Okewale I. A.; Gata Thomas Bulus

Volume/Issue : Volume 11 - 2026, Issue 5 - May

Google Scholar : https://tinyurl.com/4ftp4c6t

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DOI : https://doi.org/10.38124/ijisrt/26May010

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Abstract : Reliable rock mass characterization is essential for safe and economical engineering design in carbonate terrains; however, systematically integrated geomechanical datasets for Nigerian limestone formations remain limited in peer reviewed literature. This study presents a comprehensive geotechnical and rock mass evaluation of selected limestone deposits in Iluagba (Kogi State), Okpella (Edo State), Gboko (Benue State) and Ewekoro (Ogun State) Nigeria. A total of 300 core specimens were prepared and tested in accordance with International Society for Rock Mechanics (ISRM) and ASTM standards. Laboratory investigations included uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), porosity, bulk density, rebound hardness value (RHV), and water absorption, while field-based structural mapping was conducted to determine Rock Quality Designation (RQD) and Rock Mass Rating (RMR) parameters.

Keywords : Rock Mass Characterization; Nigerian Limestone; Uniaxial Compressive Strength; Brazilian Tensile Strength; Rock Quality Designation; Rock Mass Rating; Geomechanics; Carbonate Rocks; Engineering Suitability; Mineralogical Control.

References :

1. Ademila, O. (2020). Engineering geological evaluation of limestone deposits for construction purposes in parts of southwestern Nigeria. Environmental Earth Sciences, 79(18), https://doi.org/10.1007/s12665-020-09123-4. Pp 1–15.
2. Ademila, O., and Olayinka, A. I. (2020). Geotechnical investigation of pavement failure; causes and inherent solutions for sustainable highway construction in Sub-Saharan Africa. Rudarsko-geološko-naftni zbornik, 35(4),  https://doi.org/10.17794/rgn.2020.4.9  pp 103-114
3. Alejano, L. R. (2025). Dry masonry retaining walls: Physical models and comparison with analytical and numerical approaches. Rock Mechanics and Rock Engineering. https://doi.org/10.1007/s00603-025-04704-4
4. Bieniawski, Z. T. (1989). Engineering rock mass classifications: A complete manual for engineers and geologists in mining, civil, and petroleum engineering. New York, NY: John Wiley & Sons.
5. Chen, X., Li, Y., Zhang, Q., & Wang, Z. (2020). Effects of karstification and pore structure on the mechanical properties and stability of carbonate rocks. Engineering Geology, 276, 105764. https://doi.org/10.1016/j.enggeo.2020.105764.
6. Erharter, G. H., Bar, N., Hansen, T. F., and Jain, S. (2025). International distribution and development of rock mass classification systems: A review. Rock Mechanics and Rock Engineering. Advance online publication. https://doi.org/10.1007/s00603-024-04215-8
7. Gad, A., Arman, H., Yagiz, S., Abdelghany, O., Amin, B. M., Ahmed, A., Paramban, S., and Abu Saima, M. (2025). Strength characterization of limestone lithofacies under different moisture states. Scientific Reports, *15*(1), Article 11349,  https://doi.org/10.1038/s41598-025-22699-4
8. Li, D., Cao, C., Zhang, L., and Zhou, J. (2022). Experimental investigation on water-weakening effects of porous limestone. Rock Mechanics and Rock Engineering, 55, 4251–4265. https://doi.org/10.1007/s00603-022-02895-3
9. Li, X., Zhao, J., and Wang, Y. (2023). Machine learning-based prediction of rock strength using mineralogical and index properties. International Journal of Rock Mechanics and Mining Sciences, 167, 105358. https://doi.org/10.1016/j.ijrmms.2023.105358
10. Niu, G., He, X., Xu, H., and Dai, S. (2024). Development of rock classification systems: A comprehensive review with emphasis on AI techniques. Eng, 5(1), 217–245. https://doi.org/10.3390/eng5010012
11. Olaleye, B. M., Akinola, O. O., and Oyedele, K. F. (2019). Geotechnical properties of Ewekoro limestone for construction applications. Environmental & Engineering Geoscience, 25(4), 341–352. https://doi.org/10.2113/EEG-2043
12. Salami, B., and Adeyemi, O. (2021). Geotechnical evaluation of carbonate rocks for construction purposes in Nigeria. Environmental and Engineering Geoscience, 27(4),  https://doi.org/10.2113/EEG-2021-567 pp 341-356

13. Sun, W., Wu, Z., and Yang, S. (2022). Influence of joint orientation and spacing on mechanical behavior of layered limestone. International Journal of Rock Mechanics and Mining Sciences, 153, 105093. https://doi.org/10.1016/j.ijrmms.2022.105093
14. Wang, Y., Li, X., and Zhao, J. (2023). Influence of mineral composition and fabric on the mechanical properties of carbonate rocks. International Journal of Rock Mechanics and Mining Sciences, 164, 105290. https://doi.org/10.1016/j.ijrmms.2023.105290
15. Xu, H., He, X., and Niu, G. (2021). Effects of karstification and pore structure on strength degradation of limestone. Engineering Geology, 287, 106099. https://doi.org/10.1016/j.enggeo.2021.106099
16. Zhang, Q., Liu, H., Chen, Y., and Li, D. (2022). Microstructure-controlled deformation behavior of limestone under uniaxial compression. Engineering Geology, 305, 106728. https://doi.org/10.1016/j.enggeo.2022.106728

17. Zhao, Z., Peng, J., and Xu, W. (2021). Experimental study on water-induced weakening of limestone under uniaxial and triaxial loading. Rock Mechanics and Rock Engineering, 54, 4553–4568. https://doi.org/10.1007/s00603-021-02589-4