Geomechanics and Engineering

  • 제13권2호
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  • Pages.195-215
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  • 2017
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Optimization study on roof break direction of gob-side entry retaining by roof break and filling in thick-layer soft rock layer

  • Yang, Dang-Wei (State Key Laboratory for Geomechancis & Deep Underground Engineering, China University of Mining and Technology) ;
  • Ma, Zhan-Guo (State Key Laboratory for Geomechancis & Deep Underground Engineering, China University of Mining and Technology) ;
  • Qi, Fu-Zhou (State Key Laboratory for Geomechancis & Deep Underground Engineering, China University of Mining and Technology) ;
  • Gong, Peng (State Key Laboratory for Geomechancis & Deep Underground Engineering, China University of Mining and Technology) ;
  • Liu, Dao-Ping (State Key Laboratory for Geomechancis & Deep Underground Engineering, China University of Mining and Technology) ;
  • Zhao, Guo-Zhen (College of Mining Engineering, Taiyuan University of Technology) ;
  • Zhang, Ray Ruichong (Divison of Engineering, Colorado School of Mines)
  • 투고 : 2016.11.18
  • 심사 : 2017.03.03
  • 발행 : 2017.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper proposes gob-side entry retaining by roof break and filling in thick-layer soft rock conditions based on the thick-layer soft rock roof strata migration law and the demand for non-pillar gob-side entry retaining projects. The functional expressions of main roof subsidence are derived for three break roof direction conditions: lateral deflection toward the roadway, lateral deflection toward the gob and vertically to the roof. These are derived according to the load-bearing boundary conditions of the main roadway roof stratum. It is concluded that the break roof angle is an important factor influencing the stability of gob-side entry retaining surrounding rock. This paper studies the stress distribution characteristics and plastic damage scope of gob-side entry retaining integrated coal seams, as well as the roof strata migration law and the supporting stability of caving structure filled on the break roof layer at the break roof angles of $-5^{\circ}$, $0^{\circ}$, $5^{\circ}$, $10^{\circ}$ and $15^{\circ}$ are studied. The simulation results of numerical analysis indicate that, the stress concentration and plastic damage scope to the sides of gob-side entry retaining integrated coal at the break roof angle of $5^{\circ}$ are reduced and shearing stress concentration of the caving filling body has been eliminated. The disturbance of coal mining to the roadway roof and loss of carrying capacity are mitigated. Field tests have been carried out on air-return roadway 5203 with the break roof angle of $5^{\circ}$. The monitoring indicates that the break roof filling section and compaction section are located at 0-45 m and 45-75 m behind the working face, respectively. The section from 75-100 m tends to be stable.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Central Universities, Natural Science Foundation of Jiangsu Province

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피인용 문헌

  1. Analysis of Overburden Structure and Pressure-Relief Effect of Hard Roof Blasting and Cutting vol.2019, pp.None, 2017, https://doi.org/10.1155/2019/1354652
  2. Discussion on stability analysis and support technology of surrounding rock of gob-side entry retaining vol.21, pp.4, 2017, https://doi.org/10.21595/jve.2019.20496
  3. Application of High-Strength Lightweight Concrete in Gob-Side Entry Retaining in Inclined Coal Seam vol.2020, pp.None, 2017, https://doi.org/10.1155/2020/8167038
  4. A caving self-stabilization bearing structure of advancing cutting roof for gob-side entry retaining with hard roof stratum vol.21, pp.1, 2017, https://doi.org/10.12989/gae.2020.21.1.023