采煤对陕北榆溪河流域地下水资源的影响分析——以杭来湾煤矿开采区为例

Influence of coal exploitation on groundwater resources in Yuxi river valley of northern Shaanxi

陕北榆林榆溪河流域属于生态脆弱区,煤炭开采活动严重影响了其地下水资源及地表生态环境,导致该流域水资源严重短缺,水质变差,但很难分析评价其影响程度。以杭来湾煤矿为例,在分析水文地质工程地质条件的基础上,通过冒裂带高度、地下水静储量、地下水动储量、采空区积水的计算和实地采集水样的检测,定量识别和定性分析了煤矿开采对榆溪河流域地下水资源的破坏影响。结果表明杭来湾首采区煤炭开采造成的地下水静储量破坏值为29.76万m3,动储量破坏值为1.35万m3/h,采空区积水为5991.52万m3;开采后地下水水质基本达标,影响较小。为了补偿地下水资源的破坏,须加强矿坑水的综合利用。

Yuxi river valley at northern Shaanxi belongs to the eco -fragile region. enced groundwater and ecological environment badly and led to water shortage and ＇lhe coal exploltahon mtlupoor water quality, but the degree of influence is difficult to evaluate. Taking the coal exploiting area in Hanglaiwan coal mine as an example, on the basis of analysis of hydrological geology condition and engineering geology condition, the influence of coal mining on the groundwater resources and environment was analyzed quantitatively and qualitatively through calculation and test of water sample. The results show that the groundwater static reserves damaged by coal mining was 29.76 x 10^4m^3 and groundwater dynamic reserves destruction reached 1.35 ×10^4m^3/h and goaf water was 5991.52 × 10^4m^3. The results of test show that the groundwater is basically safe so coal mining has little impact on water quality. To make up for the destruction of ground water resources the comprehensive utilization of goaf water must be enhanced.