▎ 摘　　要

Graphene, as an emerging two-dimensional carbon nanomaterial, has attracted widespread attention and in-depth research by domestic and foreign researchers. With its excellent mechanical properties, graphene is used as a reinforcing material in polymers, ceramics and rubber, and other matrices, which can significantly improve the toughness of the matrix. However, under the action of natural factors such as continuous rainfall or heavy rain, the accumulation layer landslide is often in an unsaturated state, which is very easy to induce disasters. Based on this background, we use micronumerical simulation methods and graphene composite materials to study the mechanical properties of unsaturated soil-rock mixtures to understand the mechanical properties of unsaturated soil-rock mixtures and evaluate and predict its stability. This paper takes the soil of a landslide zone in a certain city as the numerical test object. Through the automatic generation technology of the mesostructure model of the soil-rock mixture, a series of numerical experiments were carried out on the random mesostructure model of the soil-rock mixture, and the gravel content was analyzed in depth. Experiments show that the model can reasonably describe the volume expansion of the soil-rock mixture under low confining pressure, the volume compression under high confining pressure, and the phenomenon that the peak strength of the soil-rock mixture increases with the increase of confining pressure, which verifies that the model is simulating soil and rock. This shows that the stress-strain relationship curves of different soil-rock interface parameters, rock content, saturation, and the number of wet and dry cycles all show obvious nonlinear characteristics and strain hardening. This shows that graphene composites can be used in the study of the mechanics of unsaturated soil-rock mixtures, which is of great significance for improving the landslide environment and enhancing its mechanical properties.