孟家湾勘查区采煤对地下水的影响评价

陕北侏罗纪煤田孟家湾勘查区内2-2煤层全区可采,煤层厚度变化规律明显;对地表生态有重要意义的萨拉乌苏组广泛发育,为区内主要含水层,具有供水意义;萨拉乌组下部,局部发育有以粘土为主的隔水层。通过对2-2煤层开采的最大裂隙带发育高度和上覆基岩厚度的对比分析,结果显示,裂隙带不会穿透基岩破坏萨拉乌苏组含水层,此区域在合理开采的前提下可以实现保水采煤。

Appraisal of Coal Mining Impact on Groundwater in Mengjiawan Exploration Area

The No.2-2 coal seam is mineable in the whole Mengjiawan exploration area, northern Shaanxi Jurassic coalfield; the changing of coal seam thickness has obvious regularity. The Xar Us Formation, a main aquifer of water supply and very important to surface ecology is vastly developed in the area. In lower part of Xar Us Formation, an aquifuge of clay is locally developed. Through contrastive analysis of maximum fracture zone development height induced by No.2-2 coal seam mining and overlying bedrock thickness, has demonstrated that the fracture zone will not cut through the bedrock and destruct Xar Us Formation aquifer. Under the precondition of reasonable mining, the water conservative coal mining can be realized in the area.