Shear mechanical properties of the interface between soil-rock mixture and rough structural plane.

In geotechnical engineering, it is of great importance to study the mechanical properties of the interface between geomaterials and structure. In order to understand the shear behavior of the interface between soil-rock mixture and structure, the discrete element method is used to simulate the interface shear test of soil-rock mixture and rough structural plane. Two confining pressures and three roughness are considered. In terms of mechanical properties, macro-mechanical behavior and micro-mechanical behavior are analyzed. In terms of deformation, in order to identify the local area that plays a critical role in the interface, three methods are used to quantitatively describe the shear band thickness, including localized deformation, new contact, and particle displacement. Particle displacement is a physical quantity that can be directly observed in laboratory tests, while localized deformation must be calculated and analyzed. And new contact is a quantity that can be captured by discrete element simulation. Different analysis methods of shear band thickness are suitable for analyzing different problems by different test methods. The results show that the thickness of shear band increases with the increase of structural plane roughness. The mechanism of this phenomenon is explained by the microscopic particle inlay and the active and passive earth pressure on both sides of the structural plane unit. [ABSTRACT FROM AUTHOR]