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以兴隆庄煤矿10302综放工作面开采实际为背景,采用数值模拟和现场超声成像测试相互验证的方法,对采动条件下煤层底板破坏特征进行综合对比研究。数值模拟研究表明,工作面垂直应力呈“马鞍形”分布,剪应力大致呈“蝶状”分布;现场超声成像探测表明,10302综放工作面煤层底板下16 m范围内裂隙发育较为明显,但16 m以后裂隙发育相对较少;综合分析得出该面采动底板变形破坏深度为16 m,研究结果为兴隆庄煤矿煤炭资源安全开采及矿井水害防治提供参考依据。
Taking the actual mining of 10302 fully mechanized top coal caving face in Xinglongzhuang Coal Mine as an example, the characteristics of coal seam floor under mining conditions were comprehensively and comparatively studied by the mutual verification of numerical simulation and on-site ultrasonic imaging test. The numerical simulation shows that the vertical stress of the working face is distributed in a “saddle-shaped” shape, and the shear stress is roughly “butterfly shaped.” The field ultrasonic imaging detection shows that the fractures develop within 16 m under the coal seam floor of 10302 fully mechanized caving mining face However, the development of fractures is relatively small after 16 m. The deformation and failure depth of the mining floor is 16 m. The research results provide references for safe mining of coal resources and prevention and control of mine water hazards in Xinglongzhuang Coal Mine.