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- Title
软土地区隧道-土体-地表结构筏板基础 地震响应分析.
- Authors
黄忠凯; 叶诗瑛; 张冬梅; 周文鼎; 仝 跃
- Abstract
This paper adopted a typical case of underlying tunnel-soil-surface raft foundation structure system in soft soil deposits, and established the corresponding nonlinear dynamic finite element model. The response of raft foundation, as well as the effect of surface structure on the cross-section deformation, and the internal forces of the lining under seismic loading were thoroughly investigated, considering different tunnel burial depths, different soil analysis models and the presence or absence of surface structures. The calculation results reveal that the raft foundation will suffer significant settlements and rotations, and significant soil plastic strain distributions are observed on two edges of raft foundation under the effect of seismic loading. Generally, the impact of seismic loading on shallow tunnels is greater than that on deep tunnels. Moreover, the existence of surface structure and raft foundation will significantly increase tunnel structure deformation and dynamic internal forces of the lining. Besides, the existence of surface structure and raft foundation has a greater impact on the seismic response of shallow tunnels than deep tunnels, and the seismic response of the tunnel under viscoelastic analysis is significantly lower than that from elastoplastic analysis, thus highlighting the importance of considering soil plastic characteristics in the seismic response analysis of such complex interaction systems.
- Publication
Journal of Ground Improvement, 2024, Vol 6, p22
- ISSN
2096-7195
- Publication type
Article
- DOI
10.3785/j.issn.2096-7195.2024.S1.004