准东大井矿区保水采煤开发利用研究

Study on the development and utilization of water-preserved coal mining in Dajing area of eastern Junggar coalfield

本文以准东大井矿区为研究对象,基于资料分析得到矿井主采煤层B1均处于IV含水段,通过常规经验计算方法估算了大井矿区巨厚煤层大采高分层开采和放顶煤分层开采导水裂隙带发育高度,分别为126.8~190.5m、232.9~334.5m和79.1~98.0m、158.2~196.0m,导水裂隙带均可发育至覆岩含、隔水层,从保水采煤角度出发,应减少分层采高,优先采用大采高分层开采方式。矿井涌水量达2050m^3/d,且属高矿化度矿井水,结合矿区用水现状及企业类型,初步提出可采用蒸馏、电渗析、反渗透和蒸发结晶等水处理工艺,出水可分别作为矿区生产、生活及生态用水。

Based on the analysis of the geological data of coal deposition in eastern Junggar coalfield,five aquifers and water-resistant strata of overlying rocks are recognized.The major coal seam B 1 is involved in formation of IV aquifer.The development heights of water-conducting fractured zones induced by large mining height and caving mining of super-thick seam in Dajing mining area are estimated using the conventional and empirical methods.The calculated height of water-conducting fracture zone are 126.8-190.5 m,232.9-334.5 m and 79.1-98.0 m,158.2-196.0 m respectively.During mining,the water-conducting fractures will reach the aquifers and the water-resistant strata which leads to a damage to them.It is estimated that the amount of mine water emission is up to 2 050 m^3/d during mining of the coal seam.According to the purpose of water use,the distribution of local enterprises and the quality of the mine water,a comprehensive strategies of deposing and utilizing the mine water are proposed,such as the use of manufacturing,the use of living and the use of restoration of surface vegetation.