Effects of non-liquefiable crust layer and superstructure mass on the response of 2×2 pile groups to liquefaction-induced lateral spreading

作     者：S.Mohsen Haeri Morteza Rajabigol Saman Salaripour Hiwa Sayaf Milad Zangeneh S.Mohsen Haeri;Morteza Rajabigol;Saman Salaripour;Hiwa Sayaf;Milad Zangeneh

作者机构：Department of Civil EngineeringSharif University of TechnologyTehranIran 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报(英文版))

年 卷 期：2023年第15卷第10期

页      面：2701-2719页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：support by the Construction and Development of Transportation Infrastructures Company affiliated with the Ministry of Roads and Urban Development of Iran and partial financial support granted by the Research Deputy of the Sharif University of Technology are acknowledged 

主　　题：Soil liquefaction Lateral spreading 1g shake table test Pile group Crust layer Superstructure 

摘      要：In this research,two shake table experiments were conducted to study the effects of non-liquefiable crust layer and superstructure mass on the responses of two sets of 2
2 pile groups to liquefactioninduced lateral *** this regard,an inclined base layer overlain by a very loose liquefiable layer was constructed in both models;while only in one model,a non-liquefiable crust layer was built.A lumped mass,being representative of a superstructure,was attached to the cap of one pile group in both *** models were fully instrumented with various sensors,including acceleration,displacement,and pore water pressure ***,the piles were instrumented with pair strain gauges to measure pure bending moments induced by cyclic and monotonic loadings associated with ground shaking and lateral spreading,*** results showed that the existence of the non-liquefiable crust layer increases both the maximum and residual soil displacements at the free field and also the maximum bending moments in the *** results of the experiments indicated that the crust layer induces a high kinematic lateral soil pressure and force on the piles which are not present in the crustless *** crust layer increases the pile cap displacement before liquefaction,albeit decreases it after liquefaction,due to the elastic rebound of the piles in the liquefiable *** crust layer postpones both liquefaction triggering and dissipation of excess pore water *** existence of the superstructure mass on the pile caps decreases the acceleration amplitude of the pile caps,while increases their maximum displacement.