Study on collapse behaviors of coarse grained soils

Abstract

Collapse deformation of coarse grained materials were studied based on large scale triaxial tests, stress paths of the tests were the same as what soils actually experienced in a rock-fill dam construction, these test results showed that collapse deformation of coarse soils increased with the growth of the stress level sl and the mean stress p, thus, a mathematical model was proposed to relate the collapse deformation to current stress state. The Nanshui model was modified to simulate the post-loading behaviors of the collapsed coarse soils, as was thought important in geotechnical engineering, the modified elastoplastic model conformed with the test data well.