Study on permeability resistance of Beigongcun No.2 large fault based on pumping test
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摘要: 为探究东滩煤矿七采区内北公村2号大型断层的阻渗性，在分析研究区地质及水文地质条件的基础上，结合现场水文地质补勘钻孔揭露的3煤层顶板砂岩和奥灰2个含水层稳定流抽水试验结果，初步分析了抽水试验相关数据，获得了奥灰含水层水文地质参数，发现不同位置奥灰富水性存在较大差异性，认为3煤层顶板砂岩含水层与奥灰含水层无水力联系。基于兖州矿区内现场压渗试验所获取的断层阻渗性量化参数，建立了该断层阻渗地质模型，并进行了阻渗性类比计算，与抽水试验结果对比，进一步得出该断层具有良好的阻渗性。研究结果对研究区3煤层开采工作具有科学的指导意义。Abstract: In order to study the impermeability of the Beigongcun No.2 large fault in No.7 mining area of Dongtan Coal Mine, based on the analysis of geological and hydrogeological conditions in the study area, combined with the steady flow pumping test results of the roof sandstone of No.3 coal seam and 2 Ordovician limestone aquifers exposed by the field hydrogeological drilling, the pumping test data is preliminary analyzed, the hydrogeological parameters of the Ordovician limestone aquifer are obtained, and it is found that there are great differences in water abundance of the Ordovician limestone in different locations.It is considered that there is no hydraulic connection between sandstone aquifer and Ordovician limestone aquifer of No.3 coal seam roof.Based on the quantitative parameters of impermeability obtained from the field pressure and permeability tests in Yanzhou mining area, the geological model of impermeability of the fault is established, the impermeability is calculated by analogy, and compared with the pumping test results, it is further concluded that the fault has good impermeability.The research results have scientific guiding significance for mining in the No.3 coal seam of the study area.
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Keywords:
- large fault /
- coal seam roof /
- sandstone aquifer /
- Ordovician limestone aquifer /
- pumping test /
- geological model
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