Study On Working Face Roof Rock Movementlaw And Its Stability Control Near Fault

In the coal mine mine field range, generally there are many complicated geological structures, such as the collapse column, such as fault, these geological structure will cause great influence to the mining design of the mine, at the same time, a serious threat to the safety of production. When the mining work face have to pass these geological structure, need to strengthen the support working face. Among them, the structure of fault structure complex, should not rule of the stress distribution, resulting in working face roof broken, fractured roof, at the same time, because the roof breakage properties of surrounding rock change, these characteristics make the fault of roof support becomes very difficult, and greatly increases the probability of occurrence of roof accident. Therefore, the near fault working face roof caving regularity and pressure distribution analysis and research has the extremely vital significance.The three coal mine working face 2-507 in the course of excavation roadway, expose the fault on the serious influence, therefore based on this engineering background, numerical simulation using Flac3D software to establish the model of 2-507 working face, and then simulate the working surface of the excavation to the fault direction when the movement rule of roof rock and stress conditions get the change rule of working face, coal body beyond before the pressure are studied by simulation, and the working face roof rock movement law.Combined with numerical simulation analysis of the results obtained, based on the existing theory, by using elastic-plastic mechanics theory, the mechanical model through the establishment of near fault working face is not continuous roof, analyzed the movement rule of roof strata and the stress state, derived the calculation formula of subsidence of the roof of working face, and then according to the three coal mine geological mechanics parameter of the quantitative analysis of roof subsidence and thickness of immediate roof, mining height, roof control distance, coal bulk modulus, modulus of elasticity of the relationship of direct roof, and put forward working face crossing fault reinforcement measures of.