Water cutoff curtain technology of open-pit coal mine based on low strength impermeable concrete

Authors

CAO Haidong, 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
MIAO Hechao, 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, ChinaFollow
CHI Zan, Dayan Company of China Energy Investment Corporation, Hulun Buir 021122, China
GAO Sihua, Dayan Company of China Energy Investment Corporation, Hulun Buir 021122, China

Abstract

The concrete underground continuous wall has the advantages of convenient construction, reliable quality, good impermeability and so on. It is widely used in water conservancy, hydropower, foundation pit support, subway and other impermeability projects. The materials used are both plastic concrete and rigid concrete. In the water-cutting curtain project of an open-pit coal mine in Inner Mongolia, according to its engineering geological and hydrogeological characteristics, a kind of low-strength(8-10 MPa) impermeable(P6 grade) concrete was developed as the wall casting material, which water/cementitious materials ratio is 0.68, sand ratio is 45%, For 1 m³ of concrete, the content of each material is 180 kg of cement, 200 kg of fly ash, 20 kg of bentonite, 720 kg of sand and 880 kg of stones. The mechanism of permeability and anti-permeability was analyzed, and the results were verified by the test of drilling and pumping. The test results show that the concrete wall is complete and continuous, its compressive strength is up to 8.3 MPa, and its permeability coefficient is as low as 8.67×10^-7cm/s. After the implementation of the project, the drainage of the pit is significantly reduced, and the measure guarantees the development of safety, green and sustainable of coal mine, and has a significant economic, social and ecological benefit.

Keywords

impermeable concrete, diaphragm wall, water cutoff curtain, open-pit coal mine, pumping test

DOI

10.3969/j.issn.1001-1986.2020.04.009

Recommended Citation

CAO Haidong, MIAO Hechao, CHI Zan, et al. (2020) "Water cutoff curtain technology of open-pit coal mine based on low strength impermeable concrete," Coal Geology & Exploration: Vol. 48: Iss. 4, Article 10.
DOI: 10.3969/j.issn.1001-1986.2020.04.009
Available at: https://cge.researchcommons.org/journal/vol48/iss4/10

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