Journal of South China University of Technology(Natural Science) >
Stability Analysis of Shallow Buried Tunnel Under Nonlinear Failure Criterion
Received date: 2023-05-31
Online published: 2023-11-07
Supported by
the National Natural Science Foundation of China(51978668)
The pressure value of tunnel surrounding rock is an essential parameter for shallow buried tunnel design and calculation. In order to further improve the credibility of the surrounding rock pressure calculation results, the paper proposed a circular slip surface failure model based on the traditional shallow buried tunnel collapse model. Based on the nonlinear Mohr-Coulomb failure criterion, the limit analysis upper bound method was applied to derive the formulae for calculating the pressure in shallow buried tunnel surrounding rocks under the action of seismic forces. The credibility of the calculation results was verified and the influencing factors were discussed. The high credibility and accuracy of the theoretical formula was proved through comparing the results with field engineering and existing results. It also finds that the pressure of the surrounding rock is more significantly influenced by the nonlinear coefficient and the initial cohesion; the larger the nonlinear coefficient and the smaller the initial cohesion, the greater the surrounding rock pressure. As the parameter to be defined K (ratio of horizontal surrounding rock pressure to vertical surrounding rock pressure ) decreases, the horizontal rock pressure decreases and the vertical rock pressure increases. The influence of seismic forces on the pressure of the surrounding rock cannot be ignored. The surrounding rock pressure is most affected by the vertical seismic force alone, followed by the horizontal and vertical seismic force working together, and least affected by the horizontal seismic force alone. As the horizontal and vertical seismic force coefficients increase, the surrounding rock pressure also increases. The results of the study are of high reference value for the study of most tunnels, especially shallow buried tunnels that are susceptible to seismic effects.
FU Helin , CHANG Xiaobing , HU Kaixun . Stability Analysis of Shallow Buried Tunnel Under Nonlinear Failure Criterion[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(7) : 107 -118 . DOI: 10.12141/j.issn.1000-565X.230370
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