Nonlinear anisotropic finite element analysis of liquefiable tunnel–sand–pile interaction under seismic excitation

作     者：Md.Foisal Haque Md.Foisal Haque

作者机构：Department of Civil EngineeringBangladesh University of Engineering and TechnologyDhakaBangladesh 

出 版 物：《Deep Underground Science and Engineering》 (深地科学（英文）)

年 卷 期：2023年第2卷第3期

页      面：275-285页

学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：anisotropy finite element liquefaction nonlinear seismic excitation tunnel-sand-pile interaction 

摘      要：Nonlinear time‐history analysis can be used to determine the liquefiable behaviors of the tunnel-sand-pile interaction(TSPI)model with the consideration of sand *** study presents the nonlinear response of the TSPI model with the existence of liquefaction under seismic *** analysis reveals that tunnel and pile behave as isotropic elements,while sand shows isotropic,orthotropic,and anisotropic *** constitutive models including UBC3D‐PLM(two yield surfaces associated with the hardening rule),NGI‐ADP(yielding with associated plastic potential function),and a user‐specified constitutive model are adopted to evaluate the isotropic,orthotropic,and anisotropic behaviors of *** this basis,two finite element‐based codes(ETABS 18.1.1 and Plaxis 3D)are used to evaluate sand behaviors and *** of the tunnel,sand,pile,and excess pore pressure ratio are recorded in the interaction zone by varying the pile diameter,tunnel diameter,and tunnel-pile *** with the orthotropic and isotropic conditions,lower variations of results are found in the anisotropic condition,except for the case of generation of excess pore *** addition,the present reanalysis results are in agreement with previous analytical and case study results,which further indicates the effectiveness of the finite element‐based numerical codes.