深埋缓倾斜双煤层开采导水断裂带发育规律研究
Study on development law of water-conducting fault zone in deep gently inclined double coal seam mining
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摘要: 为研究深埋缓倾斜多煤层开采导水断裂带发育特征，以石槽村煤矿2-1煤和2-2煤叠置开采区为研究对象，通过井下仰孔注水试验与数值模拟方法，对覆岩破坏及导水断裂带发育特征进行了研究。结果表明：在相同地质及开采条件下，采厚1.8 m的上覆2-1煤和采厚3.4 m的下覆2-2煤开采导水断裂带发育过程均可分为缓增阶段、突增阶段和稳定阶段，但2-2煤导水断裂带发育速度大于2-1煤导水断裂带发育速度；2-1煤和2-2煤层间距为11 m条件下，2-2煤开采产生的复合导水断裂带高度大于2-1煤开采导水断裂带高度；综合分析后确定石槽村煤矿多煤层重复采空区导水断裂带发育高度为49.6 m。Abstract: In order to study the development characteristics of water-conducting fracture zone in deep-buried gently inclined multi-coal seam mining, taking the overlapping mining area of 2-1 coal and 2-2 coal in Shicaocun Coal Mine as the research object, through the underground uphole water injection test and numerical simulation method, the overlying rock failure and the development characteristics of water-conducting fracture zone are studied. The results show that under the same geological and mining conditions, the development process of water-conducting fracture zone of overlying 2-1 coal with 1.8 m mining thickness and 2-2 coal mining thickness of 3.4 m can be divided into occurrence and slow increase stage, sudden increase stage and stable stage. However, the development rate of 2-2 coal water-conducting fracture zone is higher than that of 2-1 coal water-conducting fracture zone. Under the condition that the distance between 2-1 coal and 2-2 coal seam is 11 m, the height of compound water-conducting fracture zone produced by 2-2 coal mining is greater than that of 2-1 coal mining. After comprehensive analysis, it is determined that the development height of water diversion fracture zone in repeated goaf of multiple coal seams in Shicaocun Coal Mine is 49.6 m.
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