Fully fluid-solid coupling dynamic model for seismic response of underground structures in saturated soils  

作　　者：Li Liang Jiao Hongyun Du Xiuli Shi Peixin 

机构地区：[1]College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China [2]School of Urban Rail Transportation,Soochow University,Suzhou 215002,China

出　　处：《Earthquake Engineering and Engineering Vibration》2020年第2期257-268,共12页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of People’s Republic of China under Grant Nos.51178011 and 51778386;the Key Fundamental Study Development Project of People’s Republic of China under Grant No.2011CB013602。

摘　　要：The seismic response characteristics of underground structures in saturated soils are investigated.A fully fluid-solid coupling dynamic model is developed and implemented into ABAQUS with a user-defined element to simulate the dynamic behavior of saturated soils.The accuracy of the model is validated using a classic example in literature.The performance of the model is verified by its application on simulating the seismic response characteristics of a subway station built in saturated soils.The merits of the model are demonstrated by comparing the difference of the seismic response of an underground structure in saturated soils between using the fully coupling model and a single-phase medium model.The study finds that the fully coupling model developed herein can simulate the dynamic response characteristics of the underground structures in saturated soils with high accuracy.The seismic response of the underground structure tends to be underestimated by using the single-phase medium model compared with using the fully coupling model,which provides a weaker confining action to the underground structure.

关 键 词：UNDERGROUND structure saturated SOIL SEISMIC RESPONSE fluid-solid COUPLING dynamic model user-defined ELEMENT 

分 类 号：U231[交通运输工程—道路与铁道工程]