In this study, the X5 KCC in Shiquan Coal Mine was investigated by means of controlled source audio magnetotelluric exploration and borehole television. In this way, the subsection geological structure of the KCC was obtained. Next, the geological and electrical characteristics of each part were analyzed, and it is concluded that the development status of the mud part under coal seam floor is the key part to judging whether water inrush will occur during working face recovery under aquifer pressure. Furthermore, the mineral compositions of purplish-red mudstone and lime mudstone were obtained by performing an X-ray diffraction experiment on the KCC interstitial materials. On this basis, the water insulation properties of the mud part were qualitatively evaluated. Finally, the tensile strength of the mud part was obtained by the Brazilian splitting method, and the water insulation ability of the mud part at the periods when the tunneling roadway and the working face passed the KCC was calculated, respectively. The research results boast guiding significance for safe recovery of the working face passing KCCs under aquifer pressure.

中文翻译：

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岩溶塌陷柱地质构造勘探及泥浆部分隔水性能评价

本研究采用可控源音频大地电磁勘探和钻孔电视对石泉煤矿X5 KCC进行了调查。这样就得到了KCC的分段地质结构。其次，对各部分地质电学特征进行了分析，得出煤层底板下泥浆部分的发育状况是判断含水层压力下工作面恢复是否会发生突水的关键部分。此外，通过对KCC填隙材料进行X射线衍射实验，获得了紫红色泥岩和灰泥岩的矿物组成。在此基础上对泥浆部分的隔水性能进行定性评价。最后，采用巴西劈裂法求出泥浆部分的抗拉强度，分别计算巷道和工作面通过KCC时泥浆部分的隔水能力。研究成果对含水层压力下通过KCC的工作面安全恢复具有指导意义。