ABSTRACT
The aim of this chapter is to investigate the flow-stress coupling characteristics of bimsoil with different rock block percentages, under a series of uniaxial and triaxial flow-stress tests with various confining pressures. A self-developed servo-permeable testing system was used to carry out the flow-stress coupling test. Multiple scales of laboratory testing were conducted to reveal the non-Darcy flow of bimsoil. From the test results, the structural controlled mechanism of flow-stress coupling characteristics of the SRM is discussed. The permeability coefficient of bimsoil presents a decreasing trend with the increase of confining pressure. The relationship between permeability coefficient and confining pressure follows a quadratic polynomial function. In addition, the permeability coefficient of bimsoil presents a decreasing trend with the increase of axial stress at triaxial stress path. The stress-strain curve presents strain-hardening characteristics at different confining pressure. However, the morphology of the strain-permeability coefficient curve is different for specimens with various rock block percentages. It is found that that interaction between the soil matrix and rock blocks is the main reason leading to the variation of permeability coefficient.
