Study on Engineering Characteristics of Coarse-Grained Soil Based on Large-Scale Triaxial Test

Abstract

Using large-scale shearing device, isotropiclly consolidated-drained triaxial test under different confining pressures are performed for overburden material of ShuangJiangKou earthdam which relative density is 0.9. The engineering characteristics of coarse-grained soil such as strength and deformation is studied. The results show the peak strength of coarse-grained soil under isotropically increase with the confining pressure and there is a relationship of linear between the peak strength of coarse-grained soil and initial modulus. The volume strain value of isotropically consolidated-drained triaxial shear test increase with increase of confining pressure, and the dilatancy decrease increase with increase of confining pressure. The secant modulusEs1and the tangent modulusEt1obtained by the tests both increase with increase with increase of confining pressure, and the values ofEs1/EiandEt1/Eiare all smaller than one. The failure poisson ratioνifobtained by the tests both decrease with increase with increase of confining pressure, and there is a relationship of power function between νif and .