露天煤矿截水帷幕防渗膜垂向隐蔽铺设施工工艺  

Construction technology of vertical concealed laying of anti-seepage membrane for water cutoff curtain in the open-pit coal mine

作　　者：李文嵩 党亚堃 朱明诚 高雅 LI Wensong;DANG Yakun;ZHU Mingcheng;GAO Ya(Dayan Company of China Energy Investment Corporation,Hulun Buir 021122,China;Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China;Shaanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology,Xi’an 710077,China)

机构地区：[1]国家能源集团大雁公司,内蒙古呼伦贝尔021122 [2]中煤科工集团西安研究院有限公司,陕西西安710077 [3]陕西省煤矿水害防治技术重点实验室,陕西西安710077

出　　处：《煤田地质与勘探》2020年第4期68-73,共6页Coal Geology & Exploration

基　　金：国家重点研发计划项目课题(2017YFC0804106)。

摘　　要：防渗膜(HDPE土工膜)目前广泛应用于防污染、防渗漏、防扩散为主的防渗工程中,且铺设形式复杂多样。在我国某露天煤矿地下截水帷幕工程中,将防渗膜进行大深度垂向隐蔽铺设,深度可突破50 m,作为帷幕墙防渗主体;利用接头箱技术,实现了不同槽段间的防渗膜叠覆连接;通过注浆回填工艺,在压紧防渗膜的同时,提高了帷幕墙的抗渗性;最后采用围井抽水试验验证了墙体的防渗性,结果表明,防渗膜帷幕墙渗透系数仅为8.6×10–7cm/s,达到设计要求。防渗膜帷幕墙具有施工效率高、成本低、绿色环保等优点,其成功应用对其他类似项目具有推广借鉴意义。Anti-seepage membrane(HDPE geomembrane)is widely used in anti-seepage projects currently that mainly prevent pollution,leakage and diffusion,and its laying form was various.In an underground water cutoff curtain project of an open-pit coal mine in China,the anti-seepage membrane was laid vertically as the main body of the water cutoff curtain wall,and the largest concealed depth was about 50 m.The different groove sections was overlapping connected by using connection box technology.Through the grouting and backfilling process,the impermeability of the curtain wall was improved and the anti-seepage membrane was compacted.Finally,pumping test in the surrounding wells was used to verify the impermeability of the curtain wall.The results showed that the permeability coefficient of anti-seepage membrane curtain wall was just 8.6×10–7 cm/s which met the design requirements.The anti-seepage membrane curtain wall has the advantages of high efficiency,low cost,and environmental protection.The successful application of the anti-seepage membrane in this project has significant reference for other similar projects.

关 键 词：露天煤矿 截水帷幕 防渗膜 垂向隐蔽铺设 叠覆连接 围井试验 

分 类 号：TD824[矿业工程—煤矿开采] TV543.8[矿业工程—矿山开采]