This paper analyzed the influence of the inherent anisotropy of sand on active and passive arching by simulating the trapdoor emplying the discrete element method (DEM). The inherent anisotropy is reflected by the bedding plane angle alpha of particles. The granular material constitutive responses are captured on representative volume elements (RVEs). A new modeling method is employed to prepare particle specimens, aiming to obtain a more uniform soil model. The results indicate that the discrete element method can simulate the influence of the inherent anisotropy of granular material on the evolution of soil arching. An asymmetric arching evolution phenomena is observed in the alpha other than 0 degrees or 90 degrees cases, which leads to obvious asymmetric deformation and stress distribution in the soil. As the filling height increases, this phenomenon becomes more and more obvious. From a microscopic perspective, the reorientation of the contact normal fabric caused by particle rotation is the main reason for the differences in soil arching evolution with different alpha. This study provides a theoretical basis for predicting ground deformation failure caused by underground engineering activities and changes in surrounding environmental conditions.
