元宝山露天煤矿帷幕截水技术研究  

Water interception by cutoff curtain in Yuanbaoshan Open-pit Coal Mine

作　　者：朱宏军 张雁 孙浩 张秋园 牛光亮 ZHU Hong-jun;ZHANG Yan;SUN Hao;ZHANG Qiu-yuan;NIU Guang-liag(Xi’an Research Institute(Group)of China Coal Technology and Engineering Corp.,Xi’an 710076,China;Inner Mongolia Pingzhuang Coal Industry(Group)Co.,Ltd.,Chifeng 024050,China)

机构地区：[1]中煤科工西安研究院(集团)有限公司,陕西西安710076 [2]内蒙古平庄煤业(集团)有限责任公司,内蒙古赤峰024050

出　　处：《煤炭工程》2022年第9期64-69,共6页Coal Engineering

基　　金：中煤科工集团西安研究院有限公司科技创新项目(2020XAYJS03)。

摘　　要：元宝山露天煤矿被英金河冲、洪积形成的富水性极强的第四系含水层覆盖,为了保护矿区生态环境和地下水资源、减少疏排水量,拟采用以地下连续墙为主,钻孔注浆为辅的截水帷幕对第四系含水层进行全封闭帷幕截流,从地质条件、施工工艺、截水效果及经济效益四方面研究了截水帷幕可行性。结果表明,岩石强度一般在10MPa以下,第四系含水层渗透系数123~637m/d,帷幕基底渗透系数小于0.08m/d,地质条件允许;截水帷幕最大深度75m,施工工艺成熟;数值模拟结果显示,截水帷幕形成后矿坑第四系补给水量减少79.8%,截水效果明显;工程投资回收时间仅5.04a,经济效益显著。截水帷幕可以从根本上解决元宝山露天煤矿因大规模疏排水引起的环保风险、安全隐患和经济负担,具备可行性。Yuanbaoshan Open-pit Coal Mine is covered by the Quaternary aquifer with strong water abundance formed by the alluvial and proluvial deposits of Yingjin river.In order to protect the ecological environment and groundwater resources of the mining area and reduce the drainage water,it is proposed to adopt the water protecting curtain dominated by underground diaphragm wall and supplemented by drilling grouting to intercept the Quaternary aquifer with a fully closed curtain.The feasibility of water protecting curtain is studied from geological conditions,construction technology,water cut-off effect and economic benefit.The results show that the strength of rock is generally below 10MPa,the permeability coefficient of Quaternary aquifer is 123~637m/d,and the permeability coefficient of curtain base is less than 0.08m/d,which is allowed by geological conditions;the maximum depth of water cut-off curtain is 75m,and the construction technology is mature;the numerical simulation show that,after the formation of water protecting curtain,the Quaternary water recharge of the pit decreases by 79.8%,and the water blocking effect is obvious;investment recovery period of the project is only 5.04 years,and the economic benefit is favorable.The water protecting curtain can fundamentally solve the environmental protection risks,potential safety hazards and economic burden caused by large-scale drainage in Yuanbaoshan Open-pit Coal Mine.

关 键 词：露天矿 疏排水 第四系 补给水量 地下连续墙 钻孔注浆 

分 类 号：TD743[矿业工程—矿井通风与安全]