Vertical impedance functions of pile groups under low-to-high loading amplitudes:numerical simulations and experimental validation
作者机构：School of Science and EngineeringSaitama University255 Shimo-OkuboSaitamaJapan
出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)
年 卷 期：2023年第22卷第3期
页 面：647-666页
核心收录：
学科分类：08[工学] 081401[工学-岩土工程] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0814[工学-土木工程]
主 题：impedance functions numerical simulations model-scale experiment superposition approach soil-pile interface nonlinearity
摘 要：Piles in a group experience additional displacements in soil due to pile-to-pile interactions apart from those resulting from the external loading.The effect of these interactions determined assuming soil as an elastic and/or viscoelastic material on pile head impedance functions of the pile group is studied by relating the group stiffness to the static stiffness of a single pile.However,the prevailing elastic solutions may misestimate the resulting pile group response due to the lack of consideration for either soil(material)and/or soil-pile interface nonlinearities.It is well established that soil behaves nonlinearly under moderate-to-high loading amplitudes,and besides,the soil-pile interface nonlinearity can exist even at small loading amplitudes.This study addresses the effects of these nonlinearities on the vertical impedance functions of a 3×3-pile group using numerical methods by direct analyses and superposition using pile-to-pile interaction factors.The numerical results are validated using scaled model tests under 1 g conditions.The results highlight the overestimation of pile-to-pile interactions in the pile group when assuming elastic soil conditions.The cases either by direct analyses or superposition approach involving soil and soil-pile interface nonlinearities agree well with the experimental pile group responses under close-to-elastic and nonlinear conditions.
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