Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S1): 46-54.doi: 10.16285/j.rsm.2020.1054

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Relaxation analysis of the minimum fixed area of roof symmetric fixed block

CHEN Qing-fa1, 2, LONG En-lin2, YANG Cheng-ye3, YIN Ting-chang4, WANG Gui-bin5   

  1. 1. School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi 530004, China; 2. School of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China; 3. School of Resources, Safety and Engineering, Central South University, Changsha, Hunan 410083, China; 4. School of Engineering, Westlake University, Hangzhou, Zhejiang 310024, China; 5. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2020-07-22 Revised:2021-03-18 Online:2022-06-30 Published:2022-07-13
  • Supported by:
    This work was supported by the National Key Research and Development Plan(2018YFC0808402) and Guangxi Natural Science Foundation (2019GXNSFAA185026).

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Abstract: The existing stability analysis of symmetrical fixed block of roof does not consider the influence of original rock holding force and structural plane fracture, which easily leads to inaccurate analysis results. Based on the relaxation analysis method, the stress situation of symmetrical fixed block under clamping force is analyzed, an equivalent stress formula of fixed surface under the fracture of structural plane is deduced, the joint stress distribution state of fixed surface under the joint influence of clamping force and structural plane frac-ture is discussed, and the analytical solution of the minimum fixed area of symmetrical fixed block is given. The symmetrical fixed block is simulated by PFC2D software, the difference between the numerical solution of the minimum fixed area and the analytical solution is compared, and the field investigation is carried out on the roof breaking phenomenon of a roadway in the #105 orebody of Gaofeng mine in Guangxi. The results show that: (1) The minimum fixed area of symmetrical fixed block is positively correlated with the height of block and the angle between structural plane and vertical plane, respectively. (2) The numerical solution of the minimum fixed area is basically consistent with that of analytical solution, and the average relative error between them is 7.4%. (3) The clamped block is frac-tured and falls off, leaving visible minimum fixed area at the roof of roadway. The results are in good agreement with the results of nu-merical analysis. The research results show that the stability analysis of symmetrical fixed block of roof based on relaxation analysis method is scientific and reasonable.

Key words: fixed block, minimum fixed area, relaxation analysis method, numerical test

CLC Number: 

  • TD313
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