Full 3D Numerical Simulation Method and Its Application to Seismic Response Analysis of Water-Conveyance Tunnel

In order to depict seismic response of a newly-built shield tunnel used for water supply and its extinct features during earthquake, a three-dimensional numerical simulation method for large-scale seismic response of tunnel structure is proposed with the character of fully approximating to the reality. The development of appropriate crucial theories and methods are briefly described, including explicit finite element algorithm, time step control and equivalent connecting method between local refined model and integral model. Then the three-dimensional analytical object is set up from geometrical model to finite element model, which consists of surrounding soils, shield tunnel segments, bolts, and many other entities. This model could consider dynamic hysteretic nonlinear behaviors of soil, contact interface between soil and tunnel, contact interface between bolts and segments; and the contact interfaces between segments. Final calculation is successfully completed on a high-performance computer. According to the calculation results, the whole dynamic tendency of shield tunnel are achieved, which reveals the interaction and distortion of the foundation soil-shield tunnel system under seismic loading. Consequently, it provides a practical method and meaningful data for the seismic design and analysis of tunnel structure.