|Table of Contents|

Model test study on mechanical characteristics of surrounding rock of long-span double-arch tunnel underpassing existing subway close-spaced construction(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年06期
Page:
137-147
Research Field:
桥梁工程
Publishing date:

Info

Title:
Model test study on mechanical characteristics of surrounding rock of long-span double-arch tunnel underpassing existing subway close-spaced construction
Author(s):
WENG Xiaolin1;  CHEN Yuxun1;  JIA Jinchang2;  SHI Shaohua2;  QIN Chengwei1;  HOU Lele1
(1. School of Highway, Chang'an University, Xi'an 710064, Shannxi, China; 2. Xi'an Fengdong Municipal Engineering Construction Co. Ltd., Xi'an 710086, Shannxi, China)
Keywords:
tunnel engineering;  long-span double-arch tunnel;  underpass subway;  model test;  surrounding rock;  mechanical response
PACS:
U456
DOI:
10.19815/j.jace.2022.08064
Abstract:
Based on the existing subway structure that underpassing the section of metro line 5 of Fenghe east road municipal passageway project in Xi'an as the engineering background. The model test and finite element numerical simulation were used to study the mechanical characteristic response process of underground double-arch tunnel. The results show that with the excavation of long-span double-arch tunnel, the surface settlement presents three stages of slow increase, sharp increase and tend to be stable, and the corresponding surface settlement value is the largest at the middle partition wall, which should be strengthened monitoring and timely control of surface deformation. The change of vertical stress in vault can also present three stages of stress accumulation, stress release and stable state, and the pressure arch will be formed in a certain range to bear the upper load. The amplitude of excavation disturbance of the side wall is larger than that of the vault. The vertical stress concentration and horizontal stress release of the side wall are mainly in the range of 0.3 times to 0.5 times the span of single hole excavation. Therefore, some surrounding rocks should be reinforced by grouting in time. The test and numerical calculation results show that the stress curves of the upper and lower surfaces of the U-groove track plate are “W-shaped” and “inverted W-shaped”, and the maximum settlement and warping of the track plate appear at -0.9D to 0.9D(D is the single tunnel excavation span), where the maximum tension and compression stress occurs.The research results provide a theoretical basis for the design and construction of the tunnel, and also provide a good reference value for the construction of similar projects in the future.

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Last Update: 2023-12-01