Experimental study on mechanical characteristics of soil-structure interface

A series of soil-structure shear tests was performed by improved direct shear apparatus, and the effect of different relative roughness on mechanical characteristics of interface was studied. By means of digital camera, the displacement of sand particle near interface was recorded, and deformation mechanism was analyzed. It was shown that there exists a critical relative roughness R cr , and the soil-structure interface can be classified into two groups:smooth interface (R