Vibration-Induced Stress Changes in Saturated Soil: A High-Cycle Problem
Vibration-Induced Stress Changes in Saturated Soil: A High-Cycle Problem
复制标题
饱和土中振动引起的应力变化：一个高周期问题
DOI：
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
C. Grandas
中科院分区：
文献类型：
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作者：
V. Osinov;S. Chrisopoulos;C. Grandas
土壤循环变形的数值模拟可以使用两种类型的本构模型：增量塑性模型和所谓的显式循环模型。本文将第二类模型--高周波砂土累积模型应用于饱和土中振动应力变化的分析。该模型的应用需要同时解决两个耦合的边值问题：一个动态问题的应变幅值的确定和一个准静态问题的应力演化的计算。这两个问题的耦合已使用有限元程序Abaqus在二维轴对称公式中实现。将该模型应用于振动桩引起的混凝土墙附近应力变化的分析。数值结果表明，一个大振幅的振动，例如，在安装振动打入桩，可以大大减少有效应力和总应力在墙前。有效应力可能减小到零，导致土壤液化。
Numerical modelling of the cyclic deformation of soil can be performed with the use of two types of constitutive models: incremental plasticity models and so-called explicit cyclic models. The present study deals with the application of a model of the second type—the high-cycle accumulation model for sand—to the analysis of vibration-induced stress changes in saturated soil. The application of the model requires the concurrent solution of two coupled boundary value problems: a dynamic problem for the determination of strain amplitude and a quasi-static problem for the calculation of stress evolution. The coupling of the two problems has been implemented in a two-dimensional axisymmetric formulation with the finite-element program Abaqus. The model is applied to the analysis of stress changes near a concrete wall caused by a vibrating pile. The numerical results show that a large-amplitude vibration, e.g. during the installation of vibratory driven piles, may substantially reduce both the effective and the total stresses in front of the wall. The effective stress may be reduced to zero resulting in soil liquefaction.
关于高循环累积模型中的“弹性刚度”——继续研究
影响因子：
3.6
作者：
Wichtmann;Niemunis;Triantafyllidis
通讯作者：
Triantafyllidis
影响因子：
4
作者：
Wichtmann;Niemunis;Triantafyllidis
通讯作者：
Triantafyllidis