液化场地管廊土-结构动力相互作用特征研究

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关键词：土体液化；结构-土-结构相互作用；液化上浮

中图分类号：TU435 文献标志码：A 文章编号：1000-0844（2026）01—0114—09

DOI：10.20000/j.1000-0844.20241226002

Numerical study on the dynamic soil-structure interaction of utility tunnels in liquefiable sites

FAN Zexu1 ，YUAN Yong1'² （1.College of Civil Engineering，Tongji University ，Shanghai 2ooo92，China ; 2.State Key Laboratory of Disaster Reduction in Civil Engineering，Tongji Uniersity，Shanghai 2o92，China）

Abstract： This study employed an advanced elastoplastic constitutive model for sandy soil and fluid-solid coupling elements in ABAQUS to investigate the dynamic responses of soil-utility tunnel systems during seismic-induced liquefaction. By comparing the results of a free-field model，a single-tunnel-soil model，and twin-tunnel-soil models with simplified ground and input conditions， this study investigated the effects of soil-structure interaction and structure-soil-structure interaction （SSSI） on the development of liquefied zones and the impacts of tunnel spacing on the structural internal forces and displacement responses. Results indicate that the SSSI between adjacent tunnels significantly affects the dynamic responses of the structures and surrounding soil during liquefaction. When the spacing between adjacent tunnels is relatively small， the dynamic internal forces of the tunnels during liquefaction significantly increase compared with those in the absence of adjacent tunnels. In addition， the uplift and rotational displacements are high for adjacent twin tunnels. The amplification effects of internal forces and displacements caused by SSSI gradually diminish as the tunnel spacing increases. In the seismic design of utility tunnels accounting for liquefaction，the SSSI effects should be carefully considered if adjacent tunnels or other underground structures are present to avoid the underestimation of structural responses and corresponding safety risks.

Keywords： soil liquefaction； structure-soil-structure interaction （SSSI） ； liquefaction-induced uplift

0 引言

在地下水位较高的砂土场地中，地震引发的土体液化是影响地下结构安全性的重要次生灾害[1]对可液化场地中的浅埋地下结构而言，地震液化会导致结构出现上浮或倾斜[2]。（剩余13713字）