浅部矿井静载荷主导型冲击地压监测方法与实践
Study on complex roof support technology of mining gateway in deep mine
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摘要: 针对浅埋强冲击危险区静载荷高度集中、无顶板活动就面临冲击危险的特征,以古山煤矿为例,确定其冲击地压发生类型为集中静载荷主导型,对集中静载荷采用地震CT技术、数值模拟、现场实测等方法开展了分步评价,分步驱散,联合检验。结果表明:浅埋厚硬单层岩浆岩顶板提供集中静载荷,本次冲击地压无动载荷参与,冲击地压监测应以监控静载荷为主;据采前地震CT探测结果揭示冲击发生后,仍然存在静载荷高度集中区域;开采过程中静载荷实时监测与数值模拟揭示的强冲击危险区相吻合,微震、地音监测技术提供的动载荷信息检验了静载荷监测结果,表明工作面推进中顶板未垮断,高集中静载荷导致底板、煤层破裂。Abstract: in order to solve the dificut suppot problems of the mnining gateway with the compiex roof in a deep mine shaf,.based on theS0 m level air returning gateway inNo.4671B4 coal mining face of Xey l ine as a studly background.,the paper had an analysis on the deformationfalure features ofthe surounding rocks alongthe large cross section mining gateway with the complex of in the deep mine With the nfuences of the high ground stress and mining dynamic pressure each roof would easily cause the bed separaton and the igh sidewal feformation would infuence the stailiy of th roof. Therefore a control coumermeasueof the high stengthand ful ength resin pre- stress bolt suppor system was provided and the self designed low densit resin anchoring carrdge appied.,Aresin ill length anchoring was elized. n conmbination with thesef made optical fber and opical grating dyrnamnometry bolt.the stress features of the res i ful length anchoring bot were analzed during the heading procss of the mining gateway. The engineering practices showed that thefill lngthof the ill anchoring resin bot could cause a strong adhesion force.could effectvely control the bed separation deformation of the complex roof and could keep the stability ofthe surounding rocks along the mining gateway
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