水体下近距离煤层组安全煤(岩)柱的留设研究

Study on Preset of Safety Coal (Rock) Pillar in Closed Distance Seam Group under Water Body

为合理开发煤炭资源,最大限度地提高水体下煤炭资源的利用率,解放呆滞的煤炭资源,文章以姚桥煤矿近距离煤层组7、8号煤工作面为例,运用地质勘探、实验室土工试验和理论分析等研究方法,分析获得第四系松散层下部含、隔水层性质,从而确定了安全煤(岩)柱留设类型为防砂安全煤(岩)柱,进而合理确定了7、8号煤层安全煤(岩)柱合理留设尺寸及7、8号煤层的开采上限。

In order to rationally develop the coal resources, to maximally improve the utilization rate of the coal resources under the water body and to liberate the dead coal resources, based on the coal mining faces in No. 7 and 8 seams of the closed distance seam group in Yaoqiao Mine as a case, the geological exploration, lab soil test, theoretical analysis and other study method were applied to analyze and obtain the features of the aquifer and water isolation layer under the Quaternary loose layer. Thus type of the safety coal （rock） pillar preset was determined as a sand proof safety coal （rock） pillar. Therefore the rational size of the safety coal （rock） pillar preset in No. 7 and No. 8 seams and the mining upper limit of No. 7 and No. 8 seams were rationally determined.