皖北刘桥二矿井下析出物的成因探讨

刘桥二矿投产两年多来，井下的渗水部位不断有钙、铁、锰质等析出物形成。初步分析，这是地下水的水文地球化学环境变化及其对基岩产生机械、化学潜蚀作用的结果。析出物的形成速度较快，局部排出量大，对矿井水环境质量及基岩强度有一定影响，应引起有关部门重视。

Genesis of the Downhole Exudates in Liuqiao No. 2 Coal Mine, in the Northern Anhui

The downhole exudates mainly including travertine, Fe and Mn etc. have produced continuously from the seepage sites of underground mine since Liuqiao No. 2 Coal Mine was put into production. The result of prelinminary investigation shows that downhole exudates is a product of changes of hydrogeochemical environment and is also the result of mechanical and chemical suffosion which takes effect on the bedrocks.The material source of the exudates is chemical compositions of groundwater and bedrocks as well as the filling matters in fissures and faults. The downhole exudates are formed fast and its discharge amount is relatively large in some sites,wbereas they are also closely'related to the argillation occurred between inter layers of bedrocks of faults. Therefore, there have caused influences on the mining drainage amount and mechanical strength of the bedrocks and at the sametime on the environmental quality of mining shaft water.