为解决扎尼河露天矿矿坑疏排水量大、生产成本高、环保风险大等问题，采用地下混凝土防渗墙、防渗膜大深度垂向隐蔽铺设、高压旋喷注浆、钻孔咬合桩等4种帷幕技术，沿煤层北部隐伏露头建造一座平面长度近6 000 m、最大深度超过50 m、有效厚度＞0.6 m的弧线型沟槽灌入式+桩孔压入式落底截水帷幕。

项目实施过程中攻克了低强度(8~10 MPa)抗渗(P6级)混凝土配合比技术、超长槽段开挖与护壁技术、防渗膜叠覆铺设与连接技术、高掺量粉煤灰-水泥混合浆液注浆充填技术、砾石层中高压旋喷成桩技术等5项技术难题，在帷幕墙建造过程中和结束后，采用取芯验证法、抽水试验法、流场观测法和水量分析法等4种方法检验了帷幕墙的质量与截水效果。

结果表明混凝土浇筑连续均匀，粉煤灰-水泥混合浆液充填密实、胶结完好，高压旋喷桩和钻孔咬合桩桩径达标、桩体完整;墙体渗透系数为8.34×10^-7 cm/s，渗透性达极微透水级;墙体内外两侧最大水位差已达10 m以上;矿坑疏排水量已减少60%，目前仍在减少中。帷幕墙截水效果明显，达到了设计要求。该项目是我国露天煤矿采用综合帷幕技术解决疏排水问题的成功示范。

In order to solve the problems of huge drainage volume,high production cost and high environmental risk in Zhanihe open-pit coal mine,four kinds of curtain technologies,such as underground concrete diaphragm wall,large depth vertical concealed laying of anti-seepage membrane,high-pressure rotary jet grouting and secant pile,are used for the first time to build an arc-shaped trench filling type and pile hole pressing type bottom cut-off curtain with a plane length of nearly 6 000 m,a maximum depth of more than 50 m and an effective thickness of more than 0. 6 m along the concealed outcrop in the north of the coal seam. During the implementation of the project,five technical problems have been solved,including low-strength (8 - 10 MPa) impermeable ( P6 grade) concrete mix proportion technology,ultra-long trench excavation and wall protection technology,geomembranes overlay laying and connection technology,high-volume fly ash cement mixed slurry grouting and filling technology,high-pressure jet grouting pile technology in gravel layer. During and after the construction of the curtain wall,the quality and water cut-off effect have been tested by four methods,such as drilling core method,pumping test,flow field observation method and drain- age change analysis method. The results show that the concrete pouring is continuous and uniform,the filling of fly ash cement mixed slurry is dense and the cementation is intact,the diameter of high-pressure rotary jet grouting pile and secant pile is up to the standard,and the pile body is complete. The permeability coefficient of the wall is 8. 34×10-7 cm / s,and the permeability reaches the very micro permeability level. The maximum water level difference between the inside and outside of the wall has reached more than 10 m. The drainage volume of the mine has been reduced by 60% , which is still in the process of reduction. The curtain wall has obvious water interception effect and meets the design re- quirements. The project is a successful demonstration of using a comprehensive curtain technology to solve the drainage problem in China’s open-pit coal mines,with significant social,economic and environmental benefits. The research re- sults of the project have important application value for the development of open-pit coal mine drainage work in China, and have reference significance for the ecological environment protection in the eastern grassland area of China.