Volume 38 Issue 1
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2024  >  38(1): 14-21
He Wei, Fan Peishuo, Ge Fei, Xu Lirong, Yang Yongxiang, Zhao Yang. Reasonable Support Timing of Tunnel Pre-grooving Method and Research on Segment Joint Structure[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(1): 14-21. doi: 10.3969/j.issn.1007-2993.2024.01.003
Citation: He Wei, Fan Peishuo, Ge Fei, Xu Lirong, Yang Yongxiang, Zhao Yang. Reasonable Support Timing of Tunnel Pre-grooving Method and Research on Segment Joint Structure[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(1): 14-21. doi: 10.3969/j.issn.1007-2993.2024.01.003
shu

Reasonable Support Timing of Tunnel Pre-grooving Method and Research on Segment Joint Structure

doi: 10.3969/j.issn.1007-2993.2024.01.003
  • 1.

    Survey, Design and Research Institute of China Railway Tunnel Bureau Group Co., Ltd., Guangzhou 511400, Guangdong, China

  • 2.

    Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure, Guangzhou 511400, Guangdong, China

  • 3.

    College of Geosciences and Engineering, North China University of Water Conservancy and Hydroelectric Power, Zhengzhou 450046, Henan, China

  • Received Date: 2022-07-04
  • Accepted Date: 2023-07-17
  • Rev Recd Date: 2023-06-06
    • Available Online: 2024-02-05
  • Publish Date: 2024-02-05
    Abstract
  • Pre-grooving method is a kind of over-advance support method for tunnel excavation, which can greatly reduce the amount of surface settlement, and has less impact on the tunnel surrounding rock and soil and surface buildings (structures). Using indoor tests and numerical simulation methods, the research was carried out on the strength of the concrete used for casting pre-grooving duct piece, the reasonable support timing, and the reasonable stubbing method at the joints of the pre-grooving duct piece. The results show that the concrete with C30 proportion has a compressive strength of more than 6 MPa when curing for 1.5~2 h, which meets the requirement of mold removal; the bonding medium has obvious restraining effect on the circumferential displacement of the duct piece, and epoxy resin can be used as an excellent bonding agent for the duct piece; the ideal range of mortise and tenon joint mortise angle α is 55°~70°, and the ideal range of the depth of the mortise and tenon joint is 6~8 cm, taking into consideration of the operability of the pre-grooving process.

     

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