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Borehole Investigation of the Effectiveness of Grout Injection Technology on Coal Mine Subsidence Control

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Abstract

Grout injection into the horizontal fracture at the bed separation of an overburden is used as a surface subsidence control measure in coal-producing countries such as Poland, China, and Australia. However, the stiffness and distribution of the grouting mass in the post-injected overburden, as well as its effect on surface subsidence control, have not been investigated. To address these issues, two surface boreholes were drilled into the post-injected overburden above a longwall panel on the study site. It was found that the fly ash injected more than 7 months previously had become compacted. More than 90 % of the total fill was concentrated in the main injection section (MIS) of the overburden (thickness of 4.8–18.4 m). The MIS was located between the bottom of the injection borehole and the key stratum immediately above. Following injection, the central gob area received the maximum possible compression and served as the foundation of the support for the grout, allowing the grout to restrain the deformation of the strata above it, thus reducing surface subsidence. The results of this investigation may facilitate future injection design, thus improving the control of surface subsidence.

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Acknowledgments

This work is supported by “the Fundamental Research Funds for the Central Universities (2014ZDPY28).” The authors are grateful to the Huaibei Mining (Group) Co., Ltd. and the Huaibei Mining (Group) Exploration Engineering Co., Ltd. for their support during the field tests. In particular, we would like to thank Jianming Ni, Huaijun Yu, Kun Xu, Quan Li, Liming Ye, and Kang Liu. The authors thank the anonymous reviewer for the valuable suggestions and comments.

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Authors and Affiliations

  1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Dayang Xuan, Jialin Xu, Binglong Wang & Hao Teng

  2. School of Mines, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Dayang Xuan, Jialin Xu, Binglong Wang & Hao Teng

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  1. Dayang Xuan
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  2. Jialin Xu
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  3. Binglong Wang
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  4. Hao Teng
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Correspondence to Jialin Xu.

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Xuan, D., Xu, J., Wang, B. et al. Borehole Investigation of the Effectiveness of Grout Injection Technology on Coal Mine Subsidence Control. Rock Mech Rock Eng 48, 2435–2445 (2015). https://doi.org/10.1007/s00603-015-0710-5

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  • DOI: https://doi.org/10.1007/s00603-015-0710-5

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