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基于顶板剪切梁模型研究矩形巷道冲击地压发生问题,得到矩形断面巷道发生冲击地压的临界塑性软化区深度和临界载荷,分析巷道宽度、巷道高度或煤层厚度、顶板厚度等几何因素,以及煤层与顶板刚度比、煤的模量比、煤的强度参数、侧压力系数和水平应力分布指数等煤岩力学性质因素对临界条件的影响规律。结果表明:巷道顶板岩层以剪切变形破坏为主,当临界塑性区深度与临界载荷较小时,易于发生冲击地压,其发生频度较高,强度较小,破坏性较小;反之,冲击地压不易发生,其发生频度较低,一旦发生其强度会较大,破坏性较大。临界塑性区深度与巷道宽高比、初始粘聚力的大小无关,随顶板厚度、刚度比、模量比、水平应力分布指数的增加而增大,随煤层塑性软化刚度、内摩擦角、侧压力系数的增加而减小。临界载荷随巷道宽高比、煤层塑性软化刚度、水平应力分布指数的增加而降低,随顶板厚度、刚度比、模量比、初始粘聚力、内摩擦角、侧压力系数的增加而增大。
Based on the roof shearing beam model, the problem of rockburst in rectangular roadway was studied. The critical plasticity softening zone depth and critical load of the rock burst in the rectangular cross-section roadway were obtained. The geometrical factors such as the width of the roadway, the height of the roadway or the thickness of the roof, Coal and roof stiffness ratio, modulus ratio of coal, coal strength parameters, lateral pressure coefficient and horizontal stress distribution index and other factors of coal and rock mechanics on the critical conditions. The results show that the roof rock strata of the roadway are mainly shear deformation and failure. When the depth and critical load of the critical plastic zone are small, the rock burst is easy to occur. The occurrence frequency is higher, the intensity is smaller and the destructiveness is less. On the contrary, the impact Ground pressure is not easy to occur, its occurrence frequency is low, in the event of its intensity will be greater, more destructive. The depth of the critical plasticity zone has nothing to do with the aspect ratio and the initial cohesion of the roadway, but increases with the increase of roof thickness, stiffness ratio, modulus ratio and horizontal stress distribution index. With the plastic softening stiffness, internal friction angle, Pressure coefficient increases with decreasing. The critical load decreases with the increase of roadway aspect ratio, plastic softening stiffness of coal seam and horizontal stress distribution index, and increases with the increase of roof thickness, stiffness ratio, modulus ratio, initial cohesion, internal friction angle and lateral pressure coefficient .