Effect of installing columns from different solid waste materials on the soft clay bearing capacity

¹ Professor in Geotechnical Engineering, Shoubra Faculty of Engineering, Benha University, Egypt.
² Professors in Geotechnical Engineering. Head of Soil Mechanics Department, Construction Research Institute (CRI), National Water Research Center (NWRC), Egypt.
³ Associate Professor in Geotechnical Engineering, Shoubra Faculty of Engineering, Benha University, Egypt.
⁴ Assistant Researcher, Construction Research Institute (CRI), National Water Research Center (NWRC), Egypt.

M.M. Abdelmonem (mohamedmedhat17@hotmail.com)

Abstract

Soft clay deposits cause many problems due to low bearing capacity and high deformation. This paper presents the results of laboratory model tests for studying the improvement of soft clay-bearing capacity using two kinds of soil columns, the first is slag-cement dust columns and the second is bentonite column. Three columns from SCC (slag-cement dust columns) encased by Woven Geotextile are installed beneath a steel plate representing a footing. Four bentonite Columns (BC) encased with non-woven geotextile are installed around the steel plate at a distance of 1 B, where B is steel plate width. The research aims to assess the increase in the SCC length effect on clay-bearing capacity. A series of 4 experimental tests were performed. The results show that, the clay bearing capacity increased with the increase of column length because slag and bentonite can absorb the clay water content, leading to an increase clay shear strength. Floating columns gives better improvement than the end bearing columns. The slag partially replaced with cement dust is weak enough to transfer the total applied stress to a strong soil layer.