层状地基中楔形桩水平向非线性振动响应分析  

Horizontal nonlinear vibration response analysis of tapered pile in layered foundation

作　　者：邓淇元 涂文博 刘林芽[1] 张鹏飞[1] 刘柯兴 DENG Qiyuan;TU Wenbo;LIU Linya;ZHANG Pengfei;LIU Kexing(State Key Lab of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013

出　　处：《振动与冲击》2024年第13期126-133,共8页Journal of Vibration and Shock

基　　金：国家重点研发计划(2022YFB2602200);国家自然科学基金(52268069);中国科学技术协会青年人才托举工程(2021QNRC001);江西省主要学科学术和技术带头人培养计划(20225BCJ23011)。

摘　　要：楔形桩是一种集施工简便、承载力高等特点的新型路基处理桩型。为进一步完善楔形桩水平振动分析理论以推广其在工程中的应用,基于动力Winkler地基理论,建立楔形桩-土体水平耦合振动非线性分析模型,针对水平简谐荷载作用下层状地基中的楔形桩水平动力响应问题展开研究,并探讨不同桩身长径比对桩土分段的敏感性,研究楔形角和土体分层特性参数对楔形桩水平向非线性动力响应的规律。结果表明:随着楔形角或桩侧土体模量的增大,楔形桩水平动力特性均会得到显著改善;等体积条件下保持桩端半径不变改变桩长较保持桩长不变改变桩端半径时水平动力性能表现更好;桩侧上层土体性质变化对桩顶动力响应影响更加显著。Tapered pile is a new roadbed treatment pile type to combine characteristics of simple construction and high load-bearing capacity.Here,to further improve the theory of horizontal vibration analysis of tapered pile and promote its application in engineering,based on the dynamic Winkler foundation theory,a nonlinear analysis model of tapered pile-soil body horizontal coupled vibration was established to study horizontal dynamic response of tapered pile in layered foundation under horizontal simple harmonic load,explore the sensitivity of different pile length to diameter ratios to pile-soil segmentation,and study effects of wedge angle and soil stratification characteristics parameters on horizontal nonlinear dynamic response of tapered pile.The results showed that with increase in wedge angle or soil body modulus on pile side,horizontal dynamic characteristics of tapered pile can be significantly improved;under equal volume condition,pile horizontal dynamic performance is better when pile end radius remains unchanged and pile length is changed than that when pile end radius is changed and pile length keeps unchanged;changes in properties of soil body upper layer on pile side have a more significant impact on dynamic response of pile top.

关 键 词：楔形桩 水平振动 非线性 层状地基 时域 

分 类 号：TU470[建筑科学—结构工程]