Deformation and strength characteristics of cadmium-contaminated red clay under dry-wet cycle
Red clay in Lijiang River basin of Guilin with different cadmium ion concentrations subjected to dry-wet cycles at 40℃is taken as the research object in this paper.Triaxial test is conducted to study the effects of cadmium pollution and dry-wet cycles on the deformation and shear strength characteristics of red clay.The re-sults show that the horizontal shrinkage rate,vertical shrinkage rate and volume shrinkage rate of red clay is in-creased with time in an"S"shaped curve under different cadmium concentrations.The peak shear stress of red clay is increased with dry-wet cycles under different cadmium concentrations.With the increasing of dry-wet cy-cles,the cohesive force of cadmium-contaminated red clay tends to increase first and then decreases.Cadmium finishes its damage to the structure of red clay before the dry-wet cycles,so that the internal friction angle rea-ches the limit value,and the more increased of cadmium concentration,the more obvious the mechanical char-acteristics of the damage.
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