可液化地基中单桩基础的三维数值分析方法及应用

发布时间：2018-03-06 03:24

本文选题：液化地基　切入点：本构模型　出处：《岩土工程学报》2015年11期 　论文类型：期刊论文

【摘要】：在砂土液化大变形物理机制的基础上,建立了三维的砂土液化大变形统一本构模型,该本构模型能够实现对不同状态砂土单调和循环加载以及液化前后力学行为的统一描述。利用这一本构模型,在Open Sees有限元平台上发展了针对可液化地基中桩基础震动的三维弹塑性有限元动力时程分析方法。在有限元分析中,土体采用u p格式流体固体耦合立方体单元模拟,桩基础采用立方体实体单元模拟。利用本文建立的本构模型和相应分析方法,对水平可液化地基中单桩基础,以及发生侧向流动的倾斜地基中单桩基础的离心机振动台试验进行了三维有限元数值模拟。模拟结果验证了数值方法在模拟地基和桩基础震动响应方面的有效性。
[Abstract]:Based on the physical mechanism of large deformation of sand liquefaction, a three-dimensional unified constitutive model of large deformation of sand liquefaction is established. The constitutive model can be used to describe the monotone and cyclic loading of sand in different states and the mechanical behavior before and after liquefaction. A three-dimensional elastic-plastic finite element dynamic time-history analysis method for the vibration of pile foundation in liquefiable foundation is developed on the Open Sees finite element platform. In the finite element analysis, the fluid solid coupling cube element is used to simulate the soil mass. The solid cube element is used to simulate the pile foundation. Using the constitutive model established in this paper and the corresponding analysis method, the single pile foundation in the horizontal liquefiable foundation is studied. Three dimensional finite element numerical simulation is carried out on the centrifuge shaking table test of single pile foundation in inclined foundation with lateral flow. The simulation results verify the effectiveness of the numerical method in simulating the vibration response of foundation and pile foundation.
【作者单位】：清华大学岩土工程研究所;清华大学水沙科学与水利水电工程国家重点实验室;
【基金】：国家自然科学基金项目(51038007,51079074)
【分类号】：TU473.1

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