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中文摘要：
基于三维地基薄层法基本解,得到层状地基中的土-土相互影响因子,结合能够充分考虑被动桩与土体的共同作用的群桩动力模型,建立刚性桩筏基础的动力分析方法。通过参数（桩间距s/d和激振频率f）探讨和与刚性高承台群桩的比较,得到匀质半空间和层状地基中常见刚性桩筏基础的阻抗和内力的变化规律：①桩间土体的存在会提高群桩基础阻抗,从而进一步降低群桩基础的动力响应;②荷载在桩土之间的分配关系（桩土分担比）不是常数,随桩间距和激振频率的变化而变化;③刚性筏板的存在并没有显著地改变群桩桩顶荷载分布规律。最后,分析上海虹桥交通枢纽工程桩筏基础的阻抗函数,并指出其动力响应与一般高承台群桩的差异,为工程设计提供参考。
英文摘要：
A simplified analytical method is developed for piled-raft foundations in homogeneous and non-homogeneous soil deposits.Transfer matrix method is employused to set up the dynamic model of piled-raft foundations based on soil-soil interaction factors（calculated by using Thin Layer Method）.A comprehensive parameter study is presented to analyze the influences of pile spacing（s/d） and vibration frequency（f） on the dynamic impedance and internal force of piled-raft foundations.Major findings are： ① the soil in-between piles increases the overall foundation impedance and reduces the dynamic response;② the percentage of loads shared by piles and soils varies with the pile spacing and vibration frequency;③ the raft has little eaffect on the distribution of vertical forces among pile heads.The present model is useful for predicting the vertical impedance of a piled-raft foundation of shanghai HongQiao communication junction.
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Vertical response of pile raft foundations subjected to tunneling-induced ground movements in layere
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