Dem Simulation Of Shearing Process Of Sliding Zone

Non-uniformity generally exists in material constitution of sliding zone soils, and great changes in mechanical characteristics may take place at sliding initiation and in the sliding process. In addition, apparent liquidation occurs during the high-speed sliding, which can not be explained by using continuum mechanics. On the basis of scattered grain mechanics, study on the effect of grain discrete characteristics of the sliding zone soil on its macro mechanical features, especially on macro dynamic behavior, will help to understand the dynamic behavior of the sliding zone soil during the complex dynamic process and provide the basis for relevant test research..At present, there are two ways for the study on the multiphase dynamic process of the dynamic system for the sliding zone soil, one is setting up a continuum phase and a two-phase flowing dynamic system formed by discrete grain phase by dividing a two-phase medium and the other is building a unified model of the grain flow and studying the grain movement characteristics and the dynamic process by expressing all the multiphase constitution as the different properties of discrete elements to distinguish different phases. As to grain flow model, grain discrete elements are used to set up dynamic models.In this paper, contact mechanics among grains in the sliding zone soil is first modeled according to the transfer characteristics of the force among grains in the sliding zone soil, and the discrete element mathematic model for indoor test of the sliding zone soil is built based on soil grain distribution characteristics and proper parameter is defined for the mechanical behavior of the simulated sliding zone soil by comparing the digital tests with the physical tests.Secondly, the dynamic model of sub-phase movement of the sliding zone soil is built based on two-phase flow theory and the discrete element model of the simulated sub-phase movement by using the simulated results of indoor tests for the sliding zone soil, and verification is given for sub-phase movement characteristics in the shearing process of the sliding zone soil.Finally, particle flow simulation is made for the sliding zone having non- continuous distributed structure, and analysis and summary is made for non-continuous structure of the sliding zone in the shearing process and material movement characteristics.