Geomechanics and Engineering

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Research on no coal pillar protection technology in a double lane with pre-set isolation wall

  • Liu, Hui (Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology) ;
  • Li, Xuelong (Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology) ;
  • Gao Xin (College of Energy and Mining Engineering, Shandong University of Science and Technology) ;
  • Long, Kun (State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resource and Safety Engineering, Chongqing University) ;
  • Chen, Peng (School of Safety Engineering, North China Institute of Science & Technology)
  • Received : 2020.11.24
  • Accepted : 2021.11.10
  • Published : 2021.12.25
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Abstract

There are various technical problems need to be solved in the construction process of pre-setting an isolation wall into a double lane in the outburst prone mine. This study presents a methodology that pre-setting an isolation wall into a double lane without a coal pillar. This requires the excavation of two small section roadways to dig a wide section roadway, followed by construction of the separation wall. During this process the connecting lane is reserved. In order to ensure the stability of the separation wall, the required bearing capacity of the isolation wall is 4.66 MN/m and the deformation of the isolation wall is approximately 25 cm. To reduce the difficulty of implementing support the roadway is driven by 5 m/d. After the construction of the separation wall, the left side coal wall is brushed 1.5 m to make the width of the gas roadway reach 2.5 m and the roadway support utilizes anchor rod, ladder beam, anchor cable beam and net configuration. During construction, the concrete pump and removable self-propelled hydraulic wall mold are used to pump and pour the concrete of the isolation wall. In the process of mining, the stress distribution of coal body and isolation wall is detected and measured on site. The results demonstrate that the deformation of the surrounding rock of roadway and separation of roof in the roadway is small. The stress of the bolt and anchor cable is within equipment tolerance validating their selection. The roadway is well supported and the intended goal is achieved. The methodology can be used for reference for similar mine gas control.

Keywords

Acknowledgement

This work is supported by the National Natural Science Foundation of China (52104204), Taishan Scholars Project, Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas, Natural Science Foundation of Chongqing, China (cstc2019jcyj-bsh0041), Postdoctoral Science Foundation Project Funded by State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-BH201903), Natural Science Foundation of Shandong Province (ZR202103050647) and Natural Science Foundation of Hebei Province (E2019508100). We thank anonymous reviewers for their comments and suggestions to improve the manuscripts.

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