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为了探究深部对拉工作面采动煤层底板变形破坏特征,基于城郊煤矿二水平深部完整底板某典型对拉工作面地质和开采条件基础上,进行了地层岩组划分,建立了该工作面开采的工程地质模型。通过三维数值模拟详细分析了充分采动后该面底板不同深度最大竖直应力和塑性区的分布特征,发现了这2个重要参数在底板延深方向均具有较明显的分带性特征,在判断底板破坏深度方面具有较好的一致性,获得了该对拉工作面采动底板破坏深度在27 m左右。
In order to explore the characteristics of mining floor deformation and destruction in deep pillage working face, based on the geological and mining conditions of a typical working face of the deep complete floor in the second level of the coal mine in Chengjiao Coal Mine, stratigraphy and lithofacies division was carried out and the working face was established Engineering Geological Model. Through three-dimensional numerical simulation, the distribution characteristics of maximum vertical stress and plastic zone at different depths after fully mining are analyzed in detail. It is found that these two important parameters have obvious zonation characteristics in the direction of floor depth. Judging the depth of the destruction of the floor has a good consistency, access to the working face of the mining floor destruction depth of 27 m or so.