Effect of Lime Column Group Configuration on Total Shear Strength of Clay Based on Experimental Modelling

摘要

Lime column stabilisation has been frequently employed as a preferred ground improvementrntechnique in clayey soils. The response of the reinforced soil by lime columns is a function of differentrnfactors, the effects of some of which, such as lime content, curing time and water content, have beenrnwidely explored in the literature. The present study focuses on the geometrical effect, i.e. thernarrangements of lime columns. A series of large direct shear tests (500mm wide, 500mm long andrn250mm high) have been conducted on experimental models of lime columns with different spacing,rndiameter, number and group configuration using Barican clay from North West of Tehran, Iran. Basedrnon an experimental configuration sensitivity study, the relationship between gain in total shearrnresistance and influencing parameters has been established. The results indicate that the total shearrnstrength of the reinforced soil can increase between 40% and 120% due to lime column installation,rndepending on total area, spacing ratio and the configuration of columns. Optimum area and spacingrnratio are accordingly defined and relevant guidance on choosing appropriate lime columnrnconfiguration is provided which can be of practical use in engineering design of lime columnrnreinforced soils.