A successful case study on the reuse of gob side entry retaining by non-coal pillar mining in Gaohe mine

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Authors

  • Meng Zhang
     School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China ,CN
  • Yidong Zhang
     State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou, 221 116 ,CN
  • Ming Ji
     School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, ,CN
  • Zhaohong Chen
     School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China ,CN
  • Shuai Zhu
     School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China ,CN

Keywords:

Fully-mechanized caving face; gob-side entry retaining; plastic zone; stress distribution; control of surrounding rock.

Abstract

Based on the engineering background of gob side entry retaining in W1319 working face of Gaohe mine of Lu'an Group, this paper adopts the methods of field investigation, theoretical analysis and physical experiment to tackle the key technical problems of surrounding rock stability control during the effect of secondary mining and successfully retain roadway on site. The main research results are as follows: Firstly, the deformation and failure characteristics of surrounding rock of W1319 intake entry are investigated, the main factors affecting the stability of surrounding rock of gob-side entry retaining are determined, the key points to control the stability of surrounding rock of the gob-side entry are obtained, and the stability of top coal, coal wall and shoulder coal is determined as the starting point to control the stability of surrounding rock. Secondly, according to the stress distribution law of W1319 intake entry and the deformation and failure characteristics of surrounding rock, the reinforcement scheme of "high strength grouting + reinforcement anchor cable" combined support before secondary mining is put forward, and the concrete support parameters are obtained by theoretical analysis combined with site conditions. Industrial experiment and field mine pressure monitoring data show that the reinforcement support technology proposed can effectively control the deformation of surrounding rock, and verify the correctness of the reinforcement scheme proposed in this paper. As the first successful case of gob-side entry retaining reuse in non-pillar mining of Gaohe mine, it has a popularization significance.

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Published

2022-10-20

How to Cite

Zhang, M., Zhang, Y., Ji, M., Chen, Z., & Zhu, S. (2022). A successful case study on the reuse of gob side entry retaining by non-coal pillar mining in Gaohe mine. Journal of Mines, Metals and Fuels, 67(2), 41–50. Retrieved from https://www.informaticsjournals.com/index.php/jmmf/article/view/31462

Issue

Volume 67, Issue 2, February 2019

Section

Articles

License

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

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