Application and effect evaluation of water cutoff curtain technology in Yuanbaoshan open-pit coal mine

Authors

GAO Sheng, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, ChinaFollow
LI Guozhi, Inner Mongolia Pingzhuang Coal Industry (Group) Co., Ltd., Chifeng 024050, China
GUO Yingjie, Inner Mongolia Pingzhuang Coal Industry (Group) Co., Ltd., Chifeng 024050, China
TIAN Zenglin, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
SHAO Dongmei, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
ZHU Hongjun, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China

Abstract

Yuanbaoshan open-pit coal mine of Inner Mongolia is a rare extra large water rich open-pit coal mine at home and abroad. In order to resolve the problems of high production cost and high environmental risk caused by drainage for many years, it is plan to adopt water cutoff curtain technology to closure the seepage supply channel. By analyzing the hydrogeological and engineering geological conditions of the mine, the groundwater water control method of combining arc semi-closed curtain with group wells drainage hydraulic curtain was proposed. The curtain test study was carried out in the mine 452 m flat plate by using the vertical concealed overlay laying of geomembranes and the filling process of impermeable concrete. A water cutoff curtain with a plane length of 1 369 m, an average depth of 29 m, an effective thickness > 0.8 m and bottom embedded in bedrock surface of 3 m was built, During the test study, the technology of water cutoff curtain was determined in Yuanbaoshan open-pit mine. The main technical parameters such as the excavation length of single trench section (14 m), the retaining wall mud density (1.05-1.25 g/cm³) and the overlapping width of the geomembrane (1 m) were obtained, and the technology of underwater magnetic suction connection of geomembranes was put forward, by adding magnetic strips, the underwater self-adhesion of the geomembrane overlaps on the principle of Yin-Yang magnetic suction was accomplished. After the experiment project, the quality and water interception effect of curtain wall were tested by drilling verification, flow field analysis and runoff changes. The results show that the concrete pouring and filling is continuous and the water level difference between inside and outside of the wall has reached more than 15 m; the recharge flow of blind-ditch disappears, and the water interception effect is remarkable. The experimental research proves that the water interception curtain technology is suitable for Yuanbaoshan open-pit coal mine, and provides key technical parameters for the follow-up project, improves the water interception curtain technology system of open-pit coal mine of China.

Keywords

Yuanbaoshan open-pit coal mine, water cutoff curtain, effect test, technical parameter, geomembrane connection, experimental research

DOI

10.12363/issn.1001-1986.21.12.0768

Recommended Citation

GAO Sheng, LI Guozhi, GUO Yingjie, et al. (2022) "Application and effect evaluation of water cutoff curtain technology in Yuanbaoshan open-pit coal mine," Coal Geology & Exploration: Vol. 50: Iss. 7, Article 5.
DOI: 10.12363/issn.1001-1986.21.12.0768
Available at: https://cge.researchcommons.org/journal/vol50/iss7/5

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