水体下综放开采可行性分析

Feasibility analysis of fully mechanized mining under water body

余吾煤业现有630万吨煤炭资源处在绛河水体下,煤层厚度在4.0～6.2 m之间,现导水裂隙带经验公式不能够满足其水体下安全开采,存在开采后突水隐患,为了确定开采后上覆岩层导水裂隙带极限高度是否波及地表,研究区在9个井下钻孔进行了井下仰孔双栓塞分段注水测试和仰孔直观法电视成像仪探测,对涌水量进行了监测、水质进行了对比研究,并通过模拟实验进一步研究不同采厚条件下发育高度。观测、监测及模拟结果表明:采动后导水裂隙带发育高度取决于采厚,为水体下采煤水的防治提供了可靠数据,三个工作面的试采成功,为水体下采煤提供了应用范例。

There are 6.3 million tons coal under the water body of Jianghe river witch belongs to Yuwu coal company.The coal thickness is from 4.0 to 6.2 meters,therefore,it is difficult to mine with safety under water body that may cause water disaster after mining by using the empirical formula of water flowing fractured zone,in order to determine the upper limit of water flowing fractured zone,underground upward slant hole zonal water injection test and upward slant hole visual method boreholes television test are used in 9 boreholes to observe development height of difference mining thickness in study zone be carried out.Furthermore,inflow of water monitoring and water quality studied by comparison method and simulations are also carried out.The growth height under the condition of different mining heights are further studied.The results of observation and monitoring and simulation show that the height of water flowing fractured zone is mainly determined by coal thickness after mining,reliable data is provided for prevention and control of water in coal mining under water body,application example is provided for coal mining under water body by three faces success mining.