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Experimental Research on Dynamic Evolution Characteristics of Roof Movement and Mining-Induced Stress of Superimposed Mining in a Close Distance Coal Seam Group

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Abstract

To obtain the evolution characteristics of roof movement and mining-induced stress, the evolution of roof movement and mining-induced stress are investigated during the mining of close coal seams based on 2# and 3 + 4# coal seams in Shaqu coal mine. The results show that characteristics of macro-migration for overlying strata by superimposed mining in close coal seams are similar to that in a single coal seam. Roof strata present coordinated migration of multiple strata, and the displacements increase progressively. Roof strata can alleviate ground pressure as a cushion due to 2# coal seam mining, which reflects the stress-weakening effect under superimposed mining in close coal seams. Compared with 2# coal seam mining, the interval, support load, and dynamic pressure coefficient are reduced during periodic weighting in the 3 + 4# coal seam, and some parts of the rock undergo step-like sink. Based on above results, the hydraulic supports with high-rated working resistance are selected for superimposed mining. Finally, there was no failure among hydraulic supports or other dynamic disasters because of auxiliary measures implemented, and intensive management attention, during periodic weighting.

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Acknowledgements

This research was funded by the National Natural Science Foundation of China (Grant No. 51604154), a Key Project of the National Thirteen-Five Year Research Programme of China (Grant No. 2016ZX05067005-005), and the National Key R&D Programme of China (Grant No. 2017YFC0804206-002).

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Authors and Affiliations

  1. School of Safety Engineering, North China Institute of Science and Technology, Beijing, 101601, China

    Zhiheng Cheng

  2. Institute of Intelligent Unmanned Mining, North China Institute of Science and Technology, Beijing, 101601, China

    Zhiheng Cheng

  3. Faculty of Energy and Safety Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Haifeng Ma

  4. Mine Safety Technology Branch of China Coal, Research Institute, Beijing, 100013, China

    Cong Sang & Yanqing Liu

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  1. Zhiheng Cheng
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  2. Haifeng Ma
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  3. Cong Sang
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  4. Yanqing Liu
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Correspondence to Zhiheng Cheng or Haifeng Ma.

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Cheng, Z., Ma, H., Sang, C. et al. Experimental Research on Dynamic Evolution Characteristics of Roof Movement and Mining-Induced Stress of Superimposed Mining in a Close Distance Coal Seam Group. Geotech Geol Eng 39, 13–24 (2021). https://doi.org/10.1007/s10706-019-00968-0

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  • DOI: https://doi.org/10.1007/s10706-019-00968-0

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