THE RESEARCH AND APPLICATION OF PARTICLE DISCRETE ELEMENT MODELLING IN ROCK AND SOIL MESOSCOPIC CHARACTERISTICS AND SLOPE DEFORMATION

As a tool for studying the characteristics of bulk materials, granular discrete element method is widely used and has obvious advantages. This paper briefly introduces the basic principle of particle discrete element, an overview of the mesoscopic parameters calibration process, discusses the sandy soil and clayey soil, joint rock and the characteristics of natural gas hydrate, the research application and progress, and discussed the granular discrete element applied in study of slope deformation. When the discrete element simulation of rock and soil particles is carried out, the different parameters have certain influence on the macro parameters but there is no definite linear relation. Particle discrete element has the advantage in studying the mesoscopic properties of multiphase solid media, and can endow the material with various contact models and microscopic parameters. Therefore, the study of hydrate will promote the improvement of granular discrete element algorithm and further study on the characteristics of hydrate sediment. By coupling the particle discrete element with other methods, the research on complex engineering geological problems will be solved. In this paper, the further application of granular flow discrete element in Marine geotechnical engineering is prospected.