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| Seismic response study of close space curve tunnel cluster |
| LIN Ying1, WANG Guobo1*, SHI Longfei1, WANG Jianning2
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1. College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, Zhejiang, China;
2. China National Machinery Industry Co., Ltd., Beijing 100080, China |
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Abstract This paper focused on a practical engineering project involving a four-bore tunnel group in close proximity. Based on its features, the tunnels were simplified as spatially curved, planar curved, cambered curved, and straight tunnels. A homogeneous circular ring model was employed to establish the computational framework, enabling dynamic time-history analysis. The computational analyses conducted in this study revealed the following insights: the presence of tunnel groups had a limited impact on soil acceleration, primarily influencing soil deformation; concerning tunnel acceleration response,the acceleration in the cambered curved tunnel's cambered section surpassed other regions.This discrepancy could be attributed to the diminishing burial depth of the cambered section,signifying the influence of tunnel depth. Regarding tunnel deformation,the most significant deformation occurred at the junction of the cambered curved segment and the planar curved segment, as well as the connection between the planar curved and straight segments.It was evident that in the seismic design of curved tunnels, the connections of acute curve tunnels were identified as weak points, and the interactions among tunnel clusters under seismic effects were found to be highly complex and significant. Moreover, the interaction among tunnel groups under seismic conditions was intricate and notable. The outcomes of this research could offer valuable references for the seismic design of small-radius curved tunnels and closely spaced spatially curved tunnel groups.
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Received: 02 July 2023
Published: 20 September 2023
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