The Discrete Element Analysis For The Particle In The Structure-soil Interface With High Frequency Repeated Shearing

The contact phenomena between soil and structure is prevalent in geotechnical engineering, compared with the static load, under the high-frequency repetitive cyclic loading, changes in the physical properties of the soil will be more complex. In this article, with the basic theory of particle discrete element method, the PFC2D software is used to analyze the physical properties trend of the soil with the high-frequency repetitive shear loads. Flowing is the main work:First, summarize the research content of the predecessors, including contents of the contact surface deformation studies, the experimental means and methods for the researching of the contact surface and the mechanical properties of contact surface. And then specifically elaborated the basic assumptions of the particle discrete element method, the main constitutive relation and the basic mechanical theory of the particle discrete element method.Secondly, considering the different particles have different shape, a detailed description of using the PFC2D software to simulate the model is introduced.Again, particle discrete element simulation has done under the shearing of high-frequency repetitive process. Analyze influential factors such as the shear frequency, the shear amplitude, the stiffness of sand particles, the friction coefficient of the contact surface, the friction coefficient of the particle, the boundary confining pressure, deciding how they influenced the porosity of the saturated loose sand and the saturated dense sand. The morphological variations of the sand which near the contact surface is also been analyzed, such as changes in the pore water pressure, porosity changes, the change of shear strain.Finally, summarize the research contents of this article and lookforward the future research directions.