Determining of cohesion and internal friction angle of low-plasticity clays (CL) soils using SPT number and investigating the effect of lime on compressive strength of clay soil

Authors

Abstract

 In this study, geotechnical properties and the relationship between cohesion (C) and internal friction angle (ϕ) with SPT number is investigated in 120 boreholes in sedimentary basins of Kerman. Also, the effect of hydrated lime on petrography and mechanical properties of CL soil was investigated. The correlation between C and SPT (R2 =0.72) is stronger than that of ϕ and SPT (R2 =0.62) which shows the effect of C on the shear strength of fine-grained soils is higher than the effect of friction angle on the strength of these soils. Based on the results of the ANN model the correlation coefficients of ϕ and c with SPT are 0.84 and 0.90, respectively. Based on the R2 and RMSE, ANN showed higher accuracy than simple regression for prediction of ϕ and c parameters. It is proved that, the SPT could be used for estimating cohesion and friction angle of clays (CL) especially at the preliminary stage of projects with acceptable accuracy. To study the effect of lime on strength and compaction properties of clay soil, a set of samples were prepared by adding different contents of lime. Next, the standard Proctor test and uniaxial compressive strength test at the optimum moisture content were performed. SEM analysis showed substantial changes in the soil structure after the addition of additives. Also, an increase in the hydrated lime content results in a decrease in their maximum dry unit weight and increase in the optimum moisture content. Furthermore, it was found that an increase in hydrated lime content results in the increase of compressive strength and optimum moisture content. The maximum compressive strength is achieved at 7% hydrated lime.

Keywords


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