DETAILED SIMULATION OF THE SHAFT INGATE OF A SHIELD TUNNEL UNDER SEISMIC IMPACT

Abstract eng:
Under seismic impact, critical joints, such as connecting passages and working shafts, are the weak points in shield tunnels. Due to the sharp structural change, stress concentration in these parts is more severe than that in the regular tunnels. In order to have a better understanding of the seismic behavior of the working shaft ingate in shield tunnels, a three-dimensional finite element model is constructed based on a utility tunnel built in the north of Suzhou City beneath the Yangtze River. The numerical model is composed of three major parts, namely, the working shaft, the shield tunnel and the surrounding soil. For the sake of a realistic simulation, many details are considered in this model, including tunnel segments, bolts, layered soil, etc. The deformation and the displacement near the ingate are investigated along with the internal forces of the bolts. This numerical study is part of a research project which is aimed at analyzing the seismic performance of the very same utility tunnel in Suzhou. Meanwhile, a shaking table test is due. And many valuable predictions are drawn through the numerical analysis.

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