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Evolution and control of overburden fracture in extra-thick coal seam mining with hard roofs: ground grouting sealing and case study

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Abstract

In the process of coal mining, the original state of rock strata is seriously damaged and a large number of fractures are produced. If the fracture is connected to the overlying natural water body, leakage of surface water and ground water will cause serious mine water damage and lack of regional water resources. If the fracture is connected with gob water containing harmful gases and substances, in addition to the occurrence of mine water damage, it will pollute the water body. In the process of mining extra-thick coal seams, water inrush accidents caused by the development of large-space overburden fracture are more frequent, which causes more serious loss and pollution of water, and even desertification of land. In this paper, digital panoramic imaging technology is used to monitor the movement of overburden rock during the mining process. A reasonable time for fracture grouting sealing was proposed based on the similar simulation experiment and the evolution characteristics of fracture fractal dimension and a reasonable ground grouting sealing scheme was designed. The field monitoring results show the grouting effectively seals the fractures and reduce air leakage and solve the risk of gob water leakage above the working face. The research in this paper reveals the evolution characteristics of large-space overburden fractures in extra-thick coal seam mining with hard roofs. It shows that ground grouting sealing is an effective means to reduce the secondary disasters of fracture development, which has practical value and practical significance for environmental protection and coal safety development.

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Funding

This work was supported by the National Natural Science Foundation of China [grant number 52274135], Shanxi Provincial Science and Technology department [grant number 202203021224006], China Association for Science and Technology [grant number YESS20220245] and Shanxi Province Key Plan Project [grant numbers 202202090301011].

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Authors and Affiliations

  1. College of Mining Engineering, Taiyuan University of Technology, Shanxi, 030024, China

    **anglin Dai & Rui Gao

  2. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China

    Feng Du

  3. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China

    Bin Yu, **angbin Meng & Yang Tai

Authors
  1. **anglin Dai
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  2. Rui Gao
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  3. Feng Du
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  4. Bin Yu
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  5. **angbin Meng
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  6. Yang Tai
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Contributions

**anglin Dai, conceptualization, methodology, investigation, data curation, and writing—original draft. Rui Gao, methodology, formal analysis, investigation, writing—review and editing; Feng Du, investigation, data curation; Bin Yu, methodology, writing—review and editing, **angbin Meng, investigation; Yang Tai, investigation. All authors have read and agreed to the published version of the paper.

Corresponding author

Correspondence to Rui Gao.

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Dai, X., Gao, R., Du, F. et al. Evolution and control of overburden fracture in extra-thick coal seam mining with hard roofs: ground grouting sealing and case study. Bull Eng Geol Environ 83, 262 (2024). https://doi.org/10.1007/s10064-024-03762-2

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  • DOI: https://doi.org/10.1007/s10064-024-03762-2

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