Discussion on karst groundwater migration law under mining conditions in the Yutianbao coalmine of Chongqing
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摘要: 重庆市位于我国西南地区,五大国有煤矿多位于岩溶发育的丘陵山区,地质条件复杂,为深入探讨重庆丘陵山区采煤条件下地下水的运移规律,在鱼田堡煤矿煤层顶板长兴段灰岩地表投放示踪剂,井下不同巷道水平以及不同采区布置多个接收点实施连通试验.实验结果表明:接收点水样在雨后呈现出C1-含量升高、Cl-含量降低和C1含量不变3种变化趋势,综合连通试验结果及水化学分析得出顶板长兴段灰岩地下水在侵蚀基准面以下向开采工作面排泄,而开采结束覆岩相对稳定的采区基本无长兴段灰岩地下水排泄.研究不同采区的接收点示踪剂变化特征对深入了解地下水的运移规律,以及类似条件矿区布置防治水工作具有参考价值.Abstract: Chongqing is located in southwestern China.It hosts five major state-owned coalmines in karst hilly areas,where geological conditions are complex.For further research on groundwater migration law under mining conditions in these areas,we put the tracer on the limestone surface of the Changxing segment in the coal seam roof to conduct connection tests of receiving points which are deployed on different levels of underground roadways and different mining areas.Results show that chloride content at receiving points after rainfall have three changing trends,which are increase,decrease and unchanging.The Changxing segment limestone groundwater migrates to the mining section below erosion datum and basically has no discharge in the relatively stable overlying strata of the mining area.The study on tracer change characteristics in different mining areas provides information for understanding of groundwater migration laws and water prevention and control in mining area.
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Key words:
- karst /
- coal mine /
- connection test /
- mining crack /
- absciss layer
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