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Evaluation of Tunnel Face Stability Subjected to Seismic Load Based on the Non-associated Flow Rule
Qiguang Di,Pengfei Li,Mingju Zhang,Caixia Guo,Fan Wang,Yingjie Wei 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.5
Reasonable determination of the stability of the tunnel face under complex conditions is necessary for safe construction. This paper focuses on the seismic stability of the tunnel face in cohesion-frictional soils based on the non-associated flow rule. The pseudo-static approach is adopted to reflect the seismic effect. An analytical model is proposed based on the limit analysis method. A series of numerical simulations are performed to verify the rationality of the theoretical model. Then, parametric analyses are carried out. Results show that the proposed model is reasonable to investigate the tunnel face stability under the seismic load. The study indicates that it is essential to consider not only the seismic load but also the non-associated flow rule when determining the limit support pressure of tunnel face, especially in the soils with high friction angle or unit weight.