Roof Deformation, Failure Characteristics, and Preventive Techniques of Gob-Side Entry Driving Heading Adjacent to the Advancing Working Face

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• 作者：Jian-biao Bai ; Wen-long Shen ; Guan-long Guo…
• 关键词：Heading adjacent advancing working face ; Gob ; side entry driving ; Numerical simulation ; Theoretical calculation ; Failure criteria ; Key technology
• 刊名：Rock Mechanics and Rock Engineering
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：48
• 期：6
• 页码：2447-2458
• 全文大小：2,407 KB
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• 作者单位：Jian-biao Bai (2)
  Wen-long Shen (1) (2)
  Guan-long Guo (1) (2)
  Xiang-yu Wang (1) (2)
  Yang Yu (1) (2)
  
  2. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou, 221116, China
  1. School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, 221116, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Civil Engineering
  
• 出版者：Springer Wien
• ISSN：1434-453X

文摘

In mining excavation, the roof bending subsidence of gob-side entry driving heading adjacent to the advancing working face (HAWF) can be considerable. Influenced by the original rock pressure, the front and lateral abutment pressure of the adjacent working face, and the front abutment pressure of the current working face, the support body can easily fail, leading to serious instability of the rock mass surrounding the tunnel. To study the stress state and the deformation failure mechanism of the HAWF roof structure, we use on-site survey data, numerical simulation, and theoretical calculations to fit the spatial distribution law of mining abutment pressure piecewise, and establish a dynamic mechanical model of the roof structure. We then propose a roof failure criterion and examine the roof flexure deformation behavioral pattern. We found that the central part of the roof is the main point that controls the surrounding rock. To prevent the deformation and collapse of the roof and rock surrounding the tunnel, we propose techniques that can be applied to HAWF gob-side entry driving, including setting the coal pillar width, the driving stop and restart timing, and other control concepts. Keywords Heading adjacent advancing working face Gob-side entry driving Numerical simulation Theoretical calculation Failure criteria Key technology