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为了研究具有一定倾角煤层底板的采动破坏特征,基于矿山压力理论,建立了考虑煤层倾角的工作面侧向底板受力力学模型,采用摩尔-库仑破坏准则,推导了工作面侧向煤柱下方底板的最大破坏深度表达式。将底板采动破坏带沿煤层倾斜方向划分为3个不同区域,其呈现为一个比工作面宽度还要宽的、下大上小的“勺形”分布形态。利用数值模拟方法研究了倾角对煤层底板破坏深度、破坏形态以及最大破坏深度位置的影响规律。结果表明:1)底板塑性破坏区深度随工作面宽度的增大呈现增大的趋势;随煤层倾角的增大,先增大后减小,在煤层30°倾角时,塑性破坏区深度最大,底板岩体更容易发生剪切滑移破坏;2)工作面底板最大塑性破坏深度位置随煤层倾角的增大逐渐偏离工作面中部向下,且工作面越宽,偏离越远。
In order to study the mining failure characteristics of coal seam floor slab with a certain dip, based on the mine pressure theory, a mechanics model of the lateral bottom slab considering the dip of coal seam is established. According to the Mohr Coulomb failure criterion, The maximum depth of destruction of the floor expression. The bottom mining failure zone is divided into three different zones along the slope direction of the coal seam, which presents a “spoon-shaped ” distribution shape wider than the width of the working face. The effect of dip angle on the failure depth, failure mode and location of maximum failure depth of coal seam floor was studied by numerical simulation method. The results show that: 1) the depth of plastic failure zone of bottom slab tends to increase with the increase of working face width; first it increases and then decreases with the increase of dip of coal seam; The rock mass of the bottom plate is more prone to shearing and sliding failure; 2) The position of the maximum plastic failure depth of the floor of the working face gradually deviates from the middle of the work face as the coal seam angle increases, and the wider the work face, the farther it deviates.