Abstract
The earth rock mixture is widely distributed in nature, which is different from the general soil. The mixture is composed of high strength breccia and weak grained soil with weak strength. The whole stability of the geological body is poor, and the structure is complex, often leading to landslides, mudslides and other natural disasters. In this paper, the block type is gravel; the soil is sand containing low liquid limit clay; and the stone content is 50%. The strength and deformation characteristics of rock and soil mixture under 4 different gravel sizes are studied by three axis tests in the laboratory. The test results show that: 1). Different gravel size under different confining pressure of soil rock mixture stress-strain curve is the hardening curve. With the increase of gravel size decreases, the peak intensity of the sample is especially under high confining pressure; 2). The volume strain of different size gravel soil stone mixture under pressure the range increases with the increase of axial strain in the shear process until the damage, which has been in the shear specimen; 3) Soil and gravel mixture of the internal friction angle and fractal dimension of gravel is changed with the approximate parabolic function relationship. The results of the experimental analysis will provide a theoretical basis for further study of such special geological bodies as earth rock mixture.
