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Geomechanics and Engineering
  Volume 27, Number 6, December25 2021 , pages 537-550
DOI: https://doi.org/10.12989/gae.2021.27.6.537
 


Research on no coal pillar protection technology in a double lane with pre-set isolation wall
Hui Liu, Xuelong Li, Xin Gao, Kun Long and Peng Chen

 
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.
 
Key Words
    double lane with pre-set isolation wall; high gas mine; mining monitor; roadway protection without coal pillar
 
Address
Hui Liu: Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology,Xuzhou 221116, Jiangsu, China;
Gucheng Coal Mine, Shandong Energy Lining Coal Mine Group, Jining, 272100, Shandong, China;
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Xuelong Li: Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao, 266590, China;
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resource and Safety Engineering, Chongqing University, Chongqing 400030, China
Xin Gao: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Kun Long: State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resource and Safety Engineering, Chongqing University, Chongqing 400030, China
Peng Chen: School of Safety Engineering, North China Institute of Science & Technology, Langfang 101601, China
 

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