榆神矿区最上可采煤层赋存规律及开采危害程度

Occurrence regularity of uppermost minable coal seams and their harmful level of mining in Yushen mining area

为研究榆神矿区最上可采煤层赋存及开采对萨拉乌苏组含水层危害程度,依次分析了榆神矿区最上可采煤层赋存特征、最上可采煤层与上覆主要含(隔)水层空间分布规律及组合类型,基于基载比和采高的最上可采煤层覆岩导水裂隙带发育规律、煤层开采对萨拉乌苏组含水层危害程度,将榆神矿区开采受危害程度分为4类:自然保水区、保水采煤区(影响大区和影响小区)、采煤失水区及采煤无水区。结果表明:受构造及剥蚀作用影响,榆神矿区最上可采煤层及上覆基岩呈差异剥蚀,煤露头线从SE向NW呈阶梯状分布,最上可采煤层上覆基岩由NW到SE方向逐渐变薄。榆神矿区西部(三、四期)最上可采煤层开采后对萨拉乌苏组含水层危害程度小或没影响;榆神矿区东部(一、二期)最上可采煤层开采后对萨拉乌苏组含水层危害程度大。

In order to study the occurrence regularity of uppermost mining coal seams and the damage degree of Salawusu Formation aquifer caused by mining in Yushen mining area,occurrence characteristics of the uppermost mining coal seams was analyzed,and spatial distribution law and combination of the uppermost mining coal seams overlying strata,the development law of the water flowing fractured zone based on the ratio of rock and loading thickness and mining height,and the damage degree of the Salawusu Formation aquifer caused by coal seam mining.The damage degree of the Salawusu Formation aquifer was divided into four kinds of damage degree zones:natural water-retaining zone,water-retaining mining zone(influencing large zone and influencing small zone),water-losing mining zone and coal mining waterless zone.The results showed that the uppermost mining coal seams outcrops in Yushen mining area were stepwise distributed from SE to NW,and the overlying bedrock residual gradually thinned from NW to SE,and the thinning tends to be the opposite of the strata dip direction.According to the research,it was concluded that the mining uppermost mining coal seams in the western part of the Yushen mining area(the third and fourth phase planning areas)had little or no impact on the Salawusu Formation aquifer;the eastern part of the Yushen mining area(the first and second phase planning areas)had high damage by uppermost coal seam mining.