侧方堆载作用下高架桥群桩基础变形分析  

Analysis on Viaduct Pile-group Foundation Deformation Caused by Lateral Stack Load

作　　者：梁育玮 边学成[1,2] 董亮[3] LIANG Yuwei;BIAN Xuecheng;DONG Liang(Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou Zhejiang 310058,China;Institute of Geotechnical Engineering,Zhejiang University,Hangzhou Zhejiang 310058,China;Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing 100081,China)

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058 [3]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《铁道建筑》2017年第9期5-12,共8页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(2015G002-H)

摘　　要：针对一城际铁路由于侧向堆载而使桥墩产生侧向变形的案例,利用三维有限元软件PLAXIS 3D建立堆载-土-结构相互作用有限元模型,并通过离心机试验与现场实测结果加以验证,从而分析侧向堆载作用下桩与土的沉降、变形及桩身弯矩、轴力分布规律。首先建立了桩与承台铰接、固接的2种模型,计算得出2种工况下桩的受力与变形,现场实测墩顶中心侧向位移介于二者之间。其次分别建立桩端自由与桩端固定情况的桩基模型,计算结果表明2种情况下承台倾斜方向相反。最后对该客专高架桥桩基进行抗弯承载力检算,推断该处桩已经发生剪切破坏,并给出了不同堆载高度下堆载的安全距离。Based on a case that lateral stack load caused pier lateral deformation on intercity railway,a stack-so il-structure interaction model was established using PLAXIS3D finite element software.The model was verified by centrifuge test and field data.The settlement and lateral deformation law of soil and pile-group,and the pile bending moment and axial force caused by lateral stack loads were studied.Firstly,the hinged method and fixed method between pile and platform were respectively simulated.The stress and strain of pile were calculated in those two methods.The site test lateral displacement of the pile top center was between those two methods.Secondly,the pile-end free method and the pile-end fixed method were respectively simulated.The results show that platform inclination directions under two methods were opposite.Finally,the pile flexural capacity of the referred case was checked and the results implied that the piles were broken.The safe distances between pier and stack under different stack height were suggested.

关 键 词：高速铁路 侧向堆载 三维有限元分析 群桩基础 侧向变形 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]