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针对煤矿底板破坏深度影响因素较多,难以准确地确定难题,通过分析影响底板岩体变形程度的底板岩层的抗破坏能力和作用在底板上的矿山压力两方面因素,选取采深、采高、斜长(工作面)、倾角、底板岩性组合与顶板岩性组合6个因素进行底板破坏深度研究,以某矿4602工作面为背景概化工程地质模型进行6因素5水平正交数值模拟试验。试验结果表明,(1)影响底板破坏深度的主要因素是斜长,顶板岩性组合、底板岩性组合、采深、采高依次减弱,倾角最差;(2)首次明确了顶板岩性组合是影响底板破坏深度的关键因素;(3)建立了斜长-顶底板岩性组合-采深-采高-倾角的采动底板破坏深度预测模型,计算结果较开采规程经验公式的计算结果更接近实际,精度高、误差小,基本可以满足工程使用。研究结果对底板破坏深度的研究以及工程应用具有积极的指导意义。
According to the factors affecting the destructive depth of the coal mine floor, it is difficult to accurately determine the problem. By analyzing the destructive ability of the floor rock and the mine pressure on the floor affected by the deformation of the floor rock mass, The slope depth (working face), dip angle, the combination of lithology and roof lithology combination of six factors to study the depth of floor damage to a mine 4602 working surface as the background of the generalized engineering geological model of 6 factors and 5 levels of orthogonal numerical simulation test . The results show that: (1) The main factors that affect the failure depth of the bottom slab are the slanting length, the roof lithology combination, the floor lithology combination, the mining depth and the mining height in turn decreasing, and the dip angle is the worst; (2) Which is the key factor affecting the depth of failure of the bottom slab. (3) The prediction model of the failure depth of the mining floor with the slash-top-bottom lithology combination-mining depth-mining height-dip angle is established, and the calculation result is more than the calculated result of empirical formula Close to the reality, high precision, small error, the basic can meet the engineering use. The research results have a positive guiding significance for the research on the failure depth of the floor and engineering application.