| The paper researched the stress fields and the deformation and breakage characters of rock mass in coal seam floor under the condition of mining, which is in order to establish definite theory base to discuss inrushing water mechanism in coal seam floor. The paper adopted associative research method between theory analysis and numerical simulation analysis. At first, based on elastic and plastic theory, the stress fields and most destroying depth are divided, which are in coal seam floor under the condition of mining; in succession, which are simulated by FLAC3D, and some rule knowledge are arrived by analyzing stress states and terrane moving rules in coal seam floor. Second, the paper analyzed destroying models and factors affecting strength of joint rock mass in coal seam floor, adopted ubiquitous-joint model to simulate and analyze rock sample including two interfaces which stands some kinds of angles between them, and arrived some conclusions. Again, the paper analyzed the effect that ground water affects rock mass, the theory of solid and fluid coupling model and the simulation calculating method, simulated and analyzed the difference between solid and fluid coupling mode and solid and fluid non-coupling mode, and the effect that the change of water power affects stress field of joint rock mass under the condition of solid and fluid coupling mode, and then arrived some knowledge. At last, combined with the hydrology geological and mining conditions of LiuQiao No.1 coal mine, the engineering is analyzed.Some conclusions are made clear through the paper. Using the theory analysis and numerical simulation method can open out the stress fields, deformation and destroying characters, and destroying range and depth of rock mass in coal seam floor under the condition of mining, which is propitious to select and optimize design projects, reduce the testing time and economize the project outlays, and then improve the economy benefit and society benefit.
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