Seismic reliability analysis of shield tunnel faces under multiple failure modes by pseudo-dynamic method and response surface method

Abstract

In order to investigate the stability problem of shield tunnel faces subjected to seismic loading, the pseudo-dynamic method (P-DM) was employed to analyze the seismic effect on the face. Two kinds of failure mechanisms of active collapse and passive extrusion were considered, and a seismic reliability model of shield tunnel faces under multi-failure mode was established. The limit analysis method and the response surface method (RSM) were used together to solve the reliability of shield tunnel faces subjected to seismic action. Comparing with existing results, the results of this work are effective. The effects of seismic load and rock mass strength on the collapse pressure, extrusion pressure and reliability index were discussed, and reasonable ranges of support pressure of shield tunnel faces under seismic action were presented. This method can provide a new idea for solving the shield thrust parameter under the seismic loading.

Keywords

shield tunnel face / pseudo-dynamic method / seismic effect / multi-failure mode / support pressure range

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