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目前评阶所采煤层矿井地质条件和选择相应组对时,基本上是定性的。但是,定性选择难以定量地预计和控制工作面顶板岩石的变形和稳定性。原因是,研究支架与围岩相互作用关系时,未考虑所有煤层上部岩层的地质力学过程。为查明液压支架与其上方岩石相互作用特点,完成了实验室和现场的大量研究工作。回采面上方的岩体,可分为直接顶、中间顶和老顶。直接顶是指煤层上方很厚的一层岩层,
At the moment, the geological conditions of coal seams and the corresponding pairs of coal seams are selected, which is basically qualitative. However, it is difficult to qualitatively predict and control the deformation and stability of roof rock in the face. The reason is that the geomechanical processes of all upper coal beds are not taken into account when studying the interaction between the supports and the surrounding rock. In order to find out the characteristics of the interaction between the hydraulic support and the rock above it, a large number of laboratory and field research work has been completed. Rock face above the mining face, can be divided into direct top, middle roof and the old top. Direct top refers to a thick layer of rock above the coal seam,