富水砂卵石地层露天矿止水固坡技术研究及应用

doi:10.13722/j.cnki.jrme.2021.1063

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Abstract To solve the technical problem of water cutoff and slope reinforcement in water-rich sandy gravel aquifer in the Tenglong iron mine，aiming at the complex conditions of the slope with high water pressure and low strength，the technology of large-scale underground diaphragm wall was first introduced into the water-management field in an open-pit mine. An arc-shaped underground diaphragm wall preventing water curtain with a length of nearly 1 152 m and a maximum depth of 50 m was built along the 39 m platform on the south side of the pit. The influence laws of structural parameters of the underground diaphragm wall such as the concrete strength grade，the thickness and location of the wall，and the depth of wall embedded into the bedrock，on the lateral displacement，stress state and bending moment of diaphragm wall were analyzed by numerical experiment，and it was found that the bending moment was more sensitive to the variation of parameters. The test index“anti-bending safety”was proposed and the orthogonal experiment was designed to optimize the structural parameters of the underground diaphragm wall. The combination of optimal parameters was proposed，with the concrete strength grade of C25，the thickness of the wall of 800 mm，the depth of the wall embedded into bedrock of 2–3 m and the location of 10 m away from the outer edge of the platform. According to the numerical calculation and field monitoring results，after constructing the underground diaphragm wall，the anti-bending strength and anti-shear strength of the diaphragm wall can satisfy the specification requirements. The drainage volume of the mine has been reduced by 97%，the slope stability has been significantly improved. The diaphragm wall has the double functions of soil retaining and water cutoff. The research results have successfully solved the major technical problems of slope excavation in the open-pit mine in water-rich sandy cobble ground，and it can provide a useful reference for anti-seepage engineering in similar open-pit mines.

Key words： mining engineering open-pit mine sandy gravel aquifer diaphragm wall water cutoff and slope reinforcement

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	Articles by authors
	HAN Longqiang1
	WU Shunchuan1
	2
	GAO Yongtao2
	WANG Guanghe3
	WANG Huizhen3
	LIU Yang2
	YAN Qiong4
	ZHANG Huajin1

Cite this article:

HAN Longqiang1,WU Shunchuan1,2, et al. Research and application of technology of water cutoff and slope reinforcement in open-pit mines in sandy gravel aquifer[J]. , 2022, 41(12): 2460-2472.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1063 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I12/2460

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