Application of MJS construction method in gravel layer and pile forming difference

Authors

ZHANG Yan, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp.,Xi’an 710077, China;Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China
TIAN Zenglin, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China;Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China
CAO Haidong, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China;Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China
DANG Yakun, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China
WANG Hai, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
LI Heping, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
HAN Qiang, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China

Abstract

During the construction of water cutoff curtain in an open-pit coal mine in China, parts of the grouting groove couldnot be constructed due to many obstacles such as overhead high-voltage wire, buried optical cable and buried drainage pipe, and MJS construction method was chosen instead to build the cutoff curtain. The results of MJS pile tests show that the quality of piles formed by this method was obviously different in the construction area of gravel layer on the east and west sides. By the methods of geological exploration, gravity penetration test and pumping test, this paper makes a comparative analysis of gravel thickness, gravel diameter, sand content, formation compactness and permeability of aquifer. The results show that the pile can not be formed in the east construction area with thick gravel layer, small sand content, dense stratum and strong permeability, while the pile forming quality met the requirements in the west construction area where the conditions were opposite. The research results broaden the application scope of MJS construction method and have guiding significance for the selection of construction parameters under similar conditions.

Keywords

MJS construction method, water cutoff curtain, pumping test, permeability coefficient, dynamic penetration test, compactness, open-pit coal mine

DOI

10.3969/j.issn.1001-1986.2020.02.023

Recommended Citation

ZHANG Yan, TIAN Zenglin, CAO Haidong, et al. (2020) "Application of MJS construction method in gravel layer and pile forming difference," Coal Geology & Exploration: Vol. 48: Iss. 2, Article 24.
DOI: 10.3969/j.issn.1001-1986.2020.02.023
Available at: https://cge.researchcommons.org/journal/vol48/iss2/24

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