Fluid-Solid Coupling Analysis Of The Fault Waterproof Coal Pillar

Mine water disaster is one of the main factors which affects and threatens the safety and high-activity yield of coal mine in China. A large number of statistics indicate that water inrush has a direct relationship with fault. So setting up fault waterproof pillar is an important measurement which can stop water and prevent fault water inrush. But under many circumstances, how to set up fault waterproof pillar and what method we can use to determine the rational waterproof have no reasonable method. If the waterproof pillar dimension is too large, it can guarantee the safety of the mine, but more coal resource are backlogged. While a small waterproof pillar can threaten the safety of the mine to a degree. So a full consider a good many of factors can make a scientific and rational mine pillar, which can guarantee the safety of the mine, meanwhile reclaim the maximum mine resource.Based on the full consider of the factors which affect the fault waterproof, mechanics model is made to a good use of the finite element method of rock mechanics and the seepage theory. A coupling method is offered. Using the elastic-plastic FEM of the rock mechanics and fluid-solid coupling theory, the wall rock stress are simulated under different coal pillar. Meanwhile the stability of the fault and plastic zone are analysed. Under this condition the rational waterproof pillar is offered which can guarantee the plastic zone not spread to the fault, meanwhile reclaim the maximum mine resource.The application of numerical simulation to carry fluid-solid coupling analysis on waterproof coal pillar corresponds to the reality also is safer, which provides a reliable, new method for the design of waterproof coal pillar and has a very good application prospect.