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以青龙煤矿为试验矿井,结合导水断裂带发育高度现场实测资料,运用相似材料模拟与数值模拟相结合的方法,研究了岩溶山区采场覆岩变形破坏规律及导水断裂带高度发育情况。研究结果表明:青龙煤矿煤层开采顶板导水断裂带发育高度为42~46 m;随着工作面的推进,导水断裂带发育高度逐渐增加,最终达到稳定;开采过程中,工作面前后方煤壁处出现应力集中;上覆岩层在工作面推进结束后最终破坏形态为“马鞍形”。
Taking Qinglong Coal Mine as experimental mine, combined with the field observation data of developmental height of water-conducting fault zone, the deformation and failure rules of overlying strata in the mining area of karst mountain and the height development of water-carrying fault zone were studied by the method of combining similar material simulation with numerical simulation. The results show that the development height of roof aqueduct in Qinglong Coal Mine is 42 ~ 46 m. With the advancing of working face, the development height of water-conducting fault zone increases gradually and eventually reaches a stable condition. During the mining process, The stress concentration occurs; the overlying rock formation finally destroys the shape of “saddle” after the completion of the working face.