Abstract

Info

Author(s):: ZHAO Ying; ZHAO Ya-gebai; GUO En-dong; LIN Xiao-dong; School of Civil Engineering, Northeast Forestry University

Keywords:: tunnel engineering; metro tunnel; active fault; pseudo-static finite element method; damage analysis

Abstract:: In order to deeply study damage mechanism of metro tunnel across active fault, and find the seismic weak parts, the theoretical analysis, numerical simulation and statistical regression were used to analyze damage development of tunnel lining structure under reverse fault, and to research the influence factors of weakening tunnel earthquake disasters.The results show that the integrated finite element model of foundation soiltunnel system can well simulate reverse fault movement. The destruction is the most serious at the lining vault under reverse fault, the damage degree of structure increases with increasing of dislocation, and the damage range is mainly located in active fault. The destruction degree of lining structure can reduce with the increase of soil layer thickness under the same reverse fault dislocation. The estimation formulas of lining structural seismic weak position given can provide references for seismic design of metro tunnel across active fault. Earthquake disasters of tunnel structure can be weakened by proper increase of lining thickness, and tunnel structure in soft soil has better resistance to reverse dislocation.