Abstract
The behavior of clay beds treated with ordinary and geosynthetic-encased stone columns under vertical loads is wisely well known. Since soil movements occurring in the field conditions may cause shear deformations in the stone columns, investigating the shear behavior of clay beds treated with stone columns is necessary. Also, a wide range of clays on the ground are wet (unsaturated) or dry in place, so this paper aims to experimentally investigate the shear strength parameters of untreated and treated wet clays by ordinary and encased stone columns by performing a series of large direct shear tests. For this purpose, the effect of some variables such as tensile stiffness and length of the encasement, frictional angle and size of column’s aggregates, diameter, number and arrangement of stone columns on shear strength parameters of such soils under various normal pressures are evaluated. The obtained results show a significant improvement in the shear strength behavior of the wet clay treated by stone columns due to geotextile encasement, but the rate of this improvement depends on physical and strength properties of stone columns and encasement.
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