The Geological and Geotechnical Properties of Earth Materials of Plateau State University, Nigeria In Relation To Its Suitability for Facility Layout

Abstract

This study aims at establishing the sub-soil types and profile to ascertain the geotechnical characteristics of the underlying soils in Plateau State University, Nigeria and recommend appropriate foundation design and construction of projects in the area. Ten (10) trial pits were dugged from where representation samples were taken and subjected to laboratory tests. They are predominantly fines (silt and clay), an indication of its great influence on the engineering properties of the soil as a whole. From the plasticity values, the soils exhibits low to medium swelling potential of 11 – 23.6. The bearing capacity of the soil at 1.5m as compared with the standard values of net bearing capacity of North central zone which is between 250-500 KN/m2 is within the recommended standard for engineering works as by calculation stands at an average of 1131. 6kN/m2. Considering the moderate compressibility of the soils, any proposed foundation in the area should be supported on raft foundations founded. However, where the project precludes the use of raft foundation pile foundation should be employed to transmit the load to the underlying soil stratum.