Experimental research on shear strength of interface under high pressure

The orthogonal direct shearing experiment between building sand, standard sand, silt, clay and concrete interface, smooth metal interface, rough metal interface was conducted with a DSR-1 high-pressure shearing system. The result shows that the shear stress-shear displacement curve of interfaces presents a strain-hardening phenomenon due to the breakage of particles, and is obviously different from the shear characteristic of strain-softening under low pressure. The results of variance analysis and direct analysis of experimental data show that the relationship between the peak shear strength of an interface, as well as its residual shear strength, and the normal stress are linear; and that the normal stress is the most important factor affecting the peak shear strength and residual strength of an interface, the effect of soil properties is the second and those of shearing rate and base roughness are rather little.