水平受荷大尺寸钢管桩离心数值试验研究

发布时间：2018-03-13 23:00

本文选题：大尺寸钢管桩　切入点：离心数值试验　出处：《四川大学学报(工程科学版)》2016年06期 　论文类型：期刊论文

【摘要】：基于水平受荷钢管桩离心物理试验成果,以3维有限差分方法为技术手段开展离心数值试验,深入揭示桩-土相互作用关系。研究表明:水平受荷下钢管桩侧向变形显著受控于土层弹性模量。从桩顶变形、桩身挠度及弯矩分布等方面对比离心物理模型试验与离心数值试验成果,根据各级水平荷载条件下两者吻合程度确定参数优化方案;在此基础上提取水平受荷条件下钢管桩不同埋深截面区间的荷载-位移(p-y)关系,进而系统研究不同层位地基土所提供的水平抗力及其分布规律。物理试验和数值试验相结合可有效克服物理试验中监测数据有限、监测工具布设困难等缺点;该研究方法在获取水平受荷桩p-y曲线方面具有普遍适用性,可供实际工程中桩基水平承载力设计参考。
[Abstract]:Based on the centrifuge physical test results of horizontally loaded steel pipe piles, the centrifugal numerical tests are carried out by using the 3D finite difference method as the technical means. The study shows that the lateral deformation of steel pipe pile under horizontal loading is significantly controlled by the elastic modulus of soil layer. The results of centrifuge physical model test and centrifugal numerical test are compared in terms of deflection and bending moment distribution of pile body, and the optimization scheme of parameters is determined according to the degree of coincidence between them under various horizontal loads. On this basis, the load-displacement p-yrelation of steel pipe piles with different depth sections under horizontal loading is extracted. Furthermore, the horizontal resistance and its distribution law provided by different layers of foundation soil are systematically studied. The combination of physical test and numerical test can effectively overcome the shortcomings of limited monitoring data in physical test and difficulty in setting up monitoring tools. This research method is widely applicable in obtaining p-y curves of horizontally loaded piles and can be used as a reference for the design of horizontal bearing capacity of pile foundations in practical engineering.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;
【基金】：国家自然科学基金资助项目(51409011) 中央级科研院所基本科研业务项目资助(CKSF2015051/YT)
【分类号】：TU473.1

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