水体下厚煤层综放开采导水裂缝带发育高度

Development height of water-conducting fracture zone in fully mechanized caving mining of thick coal seam under water body

水体下煤层开采时,为防止顶板水进入采掘工作面,需要预计导水裂缝带发育高度。经坊煤矿为水体下厚煤层综放开采,运用数值模拟和理论分析的方法对厚煤层综放开采顶板导水裂缝带发育高度进行了研究,探讨该矿应用综放开采方式的安全可行性。通过研究得出:预计导水裂缝带高度168.1m;数值模拟煤层开挖后上覆岩层塑性破坏区直达含水流砂层甚至地表;由此可见,该矿采用综放开采发生顶板水灾的可能性大。

In order to prevent roof water from entering the working face, the height of water-conducting fracture zone needs to be estimated during coal seam mining under water body. In this paper, numerical simulation and theoretical analysis were used to study the development height of water-conducting fracture zone in the roof of a thick coal seam fully mechanized caving mining, and the safety feasibility of fully mechanized caving mining in this coal mine was discussed. According to the study, it was estimated that the height of water-conducting fracture zone was 168.1 m. Numerical simulation showed that the plastic failure zone of the overlying strata reached to the water-bearing sand layer and even the surface after coal seam excavation. Therefore, the possibility of roof flood in fully mechanized caving mining was high.