Three-dimensional seismic face stability of shield tunnels inundrained clay  

作　　者：Milad Davoodi Salvador Senent Amin Keshavarz Rafael Jimenez 

机构地区：[1]Civil Engineering Department,School of Engineering,Persian Gulf University,Bushehr 7516913817,Iran [2]Universidad Politecnica de Madrid,C/Prof.Aranguren s/n,Madrid 28040,Spain

出　　处：《Underground Space》2024年第2期26-43,共18页地下空间（英文）

基　　金：This research was funded,in part,by the Spanish Ministry of Science and Innovation under Grant PID2019-108060RB-I00.

摘　　要：Tunnel face stability has received increasing research interest over the past few decades. However, computing time-efficient and safethree-dimensional solutions under seismic loading is still an unsolved problem, while case studies indicate that seismic loading can be onecritical destabilizing factor affecting tunnel stability. The primary objective of this work is to fill this gap in knowledge by providing compromisingand computationally efficient solutions, along with their respective lower and upper bounds, to compute face stability underseismic conditions. The analyses employ the finite element limit analysis method to evaluate the limit support pressure in undrained clay,considering horizontal pseudo-static seismic forces pointing outwards from the face. Moreover, the analyses employ both constant andlinearly increasing shear strengths with depth. The results are summarized as dimensionless stability charts and tables to facilitate theirinterpretation and future use for tunnel design. A new design equation has been developed to evaluate the stability of the tunnel faceconsidering the effect of seismic forces. Additionally, the effects of different parameters on the shape of the failure mechanism have beeninvestigated by analysing the distribution of shear dissipation.

关 键 词：Tunnel face stability Finite element limit analysis Undrained clay Seismic stability 

分 类 号：P31[天文地球—固体地球物理学]