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分岔合并下伏煤层分层开采中,上覆煤层的采动对底板有一定的破坏影响范围,导致下层煤工作面顶板破碎,严重影响下伏煤层的正常回采。针对淮北矿业(集团)有限责任公司许疃矿71煤与72煤分岔合并现象,通过理论分析和数值模拟分析了7118工作面采动影响下底板破坏深度的范围;通过室内力学试验确定了最佳浆液水灰比为1∶1,水泥-水玻璃体积比为1∶0.4～1∶0.6之间;设计了7225工作面顶板注浆参数和注浆孔布置;通过数值模拟、相似模拟综合分析了预注浆加固效果,注浆后煤壁及顶板稳定性明显增强,顶板控制效果明显。
In bifurcation and coal seam stratification mining, the overburden mining has a certain extent of damage to the floor, resulting in the roof crushing of the lower coal face and seriously affecting the normal mining of the underlying coal seam. Aiming at the merger phenomenon of coal diversion between 71 coal and 72 coal in Xuhu Mine, Huaibei Mining (Group) Co., Ltd., the range of failure depth of floor under 7118 working face mining was analyzed by theoretical analysis and numerical simulation. The ratio of cement to water glass is 1: 1 and the volume ratio of cement to water glass is 1: 0.4 to 1: 0.6. The grouting parameters and grouting hole layout of 7225 working face are designed. Through numerical simulation and similar simulation comprehensive analysis The pre-grouting reinforcement effect, grouting coal wall and roof stability was significantly enhanced, roof control effect is obvious.