Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (4): 61-70.doi: 10.6040/j.issn.1672-3961.0.2020.523

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Stability analysis and construction mechanics of shallow buried bias tunnel openings

LU Guangzhao1, ZHOU Bo1, XU Feng1,2, SHANGGUAN Wei1, WANG Gang2, ZHANG Shubo1*   

  1. 1. China Communications First Navigation Bureau Urban Traffic Engineering Co., Ltd., Tianjin 300457, China;
    2. School of Civil Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
  • Published:2021-08-18

Abstract: In view of the stability of the surrounding rock of the shallow buried unsymmetrical pressure tunnel in broken rock mass and the selection of the tunnel construction method, the ABAQUS finite element software was selected for numerical simulation study to analyze the stress, strain and plastic zone distribution changes of surrounding rock and supporting structure under different construction methods. The results showed that: due to the obvious shallow buried and biased effects of the tunnel, the use of center diaphragm method and the double-side heading method for the entry of the tunnel could better ensure the stability of the tunnel. Under the engineering conditions, center diaphragm method had better control on the settlement and deformation of the vault and the ground surface, while the double-side pilot tunnel method had better control on the deformation of the arch waist. The internal force and bending moment of the support structure of center diaphragm method were mainly concentrated on the left side of the vault. The internal forces and bending moments of the double-side pilot pit support structure were symmetrically distributed on the left and right sides, and the anchor rod directly above the tunnel vault bore less force. The excavation step should not be too large, and each excavation should be within 2 m.

Key words: shallow buried bias, tunnel opening, surrounding rock stability, numerical simulation, construction method

CLC Number: 

  • TU45
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