Geomechanics and Engineering

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Investigation of the behavior of a tunnel subjected to strike-slip fault rupture with experimental approach

  • Zhen Cui (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences) ;
  • Tianqiang Wang (Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University) ;
  • Qian Sheng (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences) ;
  • Guangxin Zhou (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences)
  • Received : 2022.07.15
  • Accepted : 2023.03.28
  • Published : 2023.06.10
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Abstract

In the studies on fault dislocation of tunnel, existing literatures are mainly focused on the problems caused by normal and reverse faults, but few on strike-slip faults. The paper aims to research the deformation and failure mechanism of a tunnel under strike-slip faulting based on a model test and test-calibrated numerical simulation. A potential faulting hazard condition is considered for a real water tunnel in central Yunnan, China. Based on the faulting hazard to tunnel, laboratory model tests were conducted with a test apparatus that specially designed for strike-slip faults. Then, to verify the results obtained from the model test, a finite element model was built. By comparison, the numerical results agree with tested ones well. The results indicated that most of the shear deformation and damage would appear within fault fracture zone. The tunnel exhibited a horizontal S-shaped deformation profile under strike-slip faulting. The side walls of the tunnel mainly experience tension and compression strain state, while the roof and floor of the tunnel would be in a shear state. Circular cracks on tunnel near fault fracture zone were more significant owing to shear effects of strike-slip faulting, while the longitudinal cracks occurred at the hanging wall.

Keywords

Acknowledgement

This work is supported by the National Natural Science Foundation of China (nos. U21A20159, 52079133, 41902288), CRSRI Open Research Program (Program SN: CKWV2019746/KY), MOE Key Lab of Disaster Forecast and Control in Engineering, Jinan University (no. 20200904002), and the Youth Innovation Promotion Association CAS (no. 2019323).

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