基于抽水试验和放水试验的断层导水性分析
Analysis on water conductivity of fault based on pumping test and dewatering test
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摘要: 为了避免断层水害和煤层顶底板砂岩水害的发生，需要准确掌握断层的导水性；通过延安组底部宝塔山砂岩含水层的大流量大降深放水试验，查明了DF20断层在垂向上具有良好的导水性，是各含水层水力联系的重要通道，同时明确了DF20和F2断层在水平方向上具有导水性，三叠系含水层通过DF20和F2断层与宝塔山砂岩含水层等具有水力联系；探查了DF20断层与FD5断层交汇处导水性最强，是各含水层水量交换的主要位置；确定了DF20断层导水性在水平方向上具有不均一性，DF20断层位于井田中部的区域导水性较弱，而井田南部区域导水性较强。结果表明：通过抽水试验和放水试验不仅可以获取断层的水文地质参数，同时可以查明断层的导水性及其空间特征。Abstract: In order to avoid the water disaster of fault and sandstone below the coal seam, it is necessary to master the conductivity of fault accurately. Through the dewatering test with large drawdown and water flow of Baotashan sandstone aquifer in the bottom of Yan’an Formation, the good conductivity of DF20 fault in vertical was found out, and the DF20 fault is an important hydraulic connection channel of each aquifer. It is clear that DF20 and F2 fault have hydraulic connection in horizontal direction, and Triassic aquifer has the hydraulic connetion with Baotashan sandstone aquifer by DF20 and F2 faults. It is proposed that the intersection of DF20 and FD5 faults has the strongest conductivity and is the main location of water exchange of each aquifer. The conductivity of DF20 fault is not uniform in the horizontal direction. The conductivity of DF20 fault located in the middle of the coal field is weak, while the conductivity of DF20 fault in the south of the coal field is strong. The results show that the hydrogeological parameters of the fault not only can be obtained through the pumping test and dewatering test, but also the hydrogeological conductivity and spatial characteristics of the fault can be found out.
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Keywords:
- Jurassic coalfield /
- fault /
- water conductivity /
- pumping test /
- dewatering test /
- groundwater flow field
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