截水帷幕作为一种有效阻隔或减少地下水入渗的防治水技术，近年来不断被应用于地下开采煤矿和露天开采煤矿。受接缝、夹层等质量缺陷的影响，截水帷幕一般需要通过计算渗透系数来评价工程防渗性能，渗透系数的大小可直接决定截水帷幕防渗质量。以扎尼河、元宝山露天煤矿、朱仙庄煤矿截水帷幕工程为例，采用围井抽水试验、完整井抽水试验、降水头注水试验、钻孔压水试验、岩心渗透性试验5种方法计算了截水帷幕渗透系数，并提出了5种计算方法的应用特点与适用条件。结果表明：各计算方法所得渗透系数虽存在差异，但能够相互验证；抽水试验、注水试验、岩心渗透性试验较适用于露天煤矿墙体式帷幕，钻孔压水试验则更适用于检验地下开采煤矿注浆帷幕防渗性能；5种方法能够分别从点、线、面、体4个不同角度计算截水帷幕渗透系数，全方位检验帷幕墙接缝与浇筑质量；多种方法结合应用可以更为全面地验证截水帷幕渗透系数的准确性。

As an effective water prevention and control technology to block or reduce groundwater infiltration, water cut-off curtain has been continuously applied to underground and open pit coal mines in recent years. Influenced by quality defects such as joints and interlayer, the cut-off curtain generally needs to evaluate the anti-seepage performance by calculating the permeability coefficient, which can directly determine the anti-seepage quality of the cut-off curtain. Taking Zhanihe Open-pit Coal Mine and Yuanbaoshan Open-pit Coal Mine and Zhuxianzhuang Coal Mine as examples, the seepage coefficient of the water cut-off curtain is calculated by five methods, including the well enclosure pumping test, the complete well pumping test, the water injection test of the precipitation head, the water pressure test of the borehole and the core permeability test. The results show that there are differences in the results obtained by various calculation methods, but they can be mutually verified; the pumping test, water injection test and core permeability test are mostly used to test the permeability coefficient of the cut-off curtain in open pit coal mines, while the borehole water pressure test is more suitable for testing the seepage resistance of the grouting curtain in underground coal mines. The five calculation methods can respectively calculate the permeability coefficient of the water cut-off curtain from four different angles of point, line, surface and body, and comprehensive inspection of curtain wall seams and pouring quality. The combination of multiple methods can more comprehensively verify the permeability coefficient of the cut-off curtain.