Soil-rock mixture is usually the main material for reservoir slope,landslide and dam foundation. The physical and mechanical properties of soil-rock mixture are more complicated than common soil mass or rock mass,which is a difficult problem for researchers in the fields of rock mechanics,soil mechanics and geological engineering. In order to study the effect of gravel on uniaxial compressive strength and the mode of deformation failure of soil-rock mixture,we carried out unconfined uniaxial compression tes...