Study On Seepage Characteristics Of Fractured Rock Mass Water And Sediment Based On Discrete Element

Center of development of coal resources in China gradually moved to the West, and Western mining have shallow buried depth, thin bedrock characteristic and thick overlying Aeolian sand. Water and sand inrush disaster-prone seriously threat to safety and the environment. Study on fractured rock mass seepage characteristic has important significance.This paper analyses the basic mechanical properties of fractured rock mass and study on mechanism of water & sand seepage in fractured rock mass and establishing sediment coupled model of seepage in fractured rock mass and numerical analysis on flow characteristics of sediment transport in fractured rock. Main research works are as follows:(1) Analysis of basic mechanical properties of fractured rock mass. Based on discrete element method in fractured rock-loading process to study the relationship between stress-strain characteristics and acoustic emission characteristics, based on the Mohr-Coulomb criterion to analyze the strength of fractured rock mass structural plane and numerical simulation analysis different angle and different curved fissure rock damage and fracture failure process of rock crack propagation changes. Studies have shown that rock strength depends not only on the degree of fracture development also depends on the fracture surface, fracture dip, morphological changes will have a different impact on the overall strength of the rock.(2) Establish fractured rock mass seepage calculation model of water and sediment. First, individual solid particles theoretical analysis and numerical simulation of flows in a liquid and obtained the turbulent water flow with complex. Secondly, an analysis of the interaction mechanism of solid particles, defining fractures overlying unconsolidated layers of solid particles three dynamic domain. Finally, simplify the fractured rock mass based on parallel-plate theory, establishing networks of fractured rock mass seepage model of water and sediment, and to simulate the flow of water and sediment. Research has shown that internal fractures of fractured rock mass through, fracture corner, crack widths and crack inclination would have an effect on the rate of percolation of water and sediment, sediment filtration process, solid particles and water action and inclination angle of cracks and fissures of the rock width.(3) Study on water and sediment seepage in fractured rock mass. Based overlying water-bearing pressure distribution, study on the law of overlying unconsolidated layers along with crack width and crack inclination. Based on discrete element methods, systematic analysis the effect of rock mass fracture width, crack patterns, and water stress on water and sediment seepage. Theoretical analysis and numerical simulation research on sand inrush of ground surface dynamic evolution of the funnel, funnel formed by the sand inrush extended depth and radius changes over time have a power function.