砂土三维多重机构边界面模型

发布时间：2018-03-13 01:09

本文选题：本构模型　切入点：边界面　出处：《岩土工程学报》2017年07期 　论文类型：期刊论文

【摘要】：以土的临界状态和边界面塑性理论为基础,引入状态参数,考虑砂土的剪胀特性,提出一个新型三维多重机构边界面模型。模型将复杂的宏观变形行为分解为一个宏观体应变机构和一系列空间分布的虚拟一维微观剪切机构。每个微观剪切机构包含一个微观剪应力应变关系和一个微观应力剪胀关系。利用三轴压缩试验中的应力条件,建立典型宏微观参数之间的关系。模型包含13个参数,多数可通过具有明确物理意义的土性参数来确定。通过对砂土三轴压缩试验和空心圆柱扭剪试验结果的数值模拟,表明模型不但能够合理反映在排水或不排水条件下砂土的硬化及软化特性,而且能在不增加任何参数条件下预测应力主轴旋转产生的变形累积特性和应变增量主轴与应力主轴之间的非共轴特性。
[Abstract]:Based on the critical state of the soil and the plastic theory of the boundary surface, the state parameters are introduced, and the shear expansion characteristics of the sand are considered. A new three dimensional boundary surface model of multiplex mechanism is proposed. The model decomposes the complex macroscopic deformation behavior into a macro volume strain mechanism and a series of virtual one dimensional micro shear mechanisms with spatial distribution. It consists of a micro shear stress strain relation and a micro stress shear expansion relationship. The stress condition in triaxial compression test is used. The model consists of 13 parameters, most of which can be determined by soil parameters with clear physical meaning. The numerical simulation of the results of triaxial compression test and hollow cylindrical torsional shear test of sand and soil is carried out. It is shown that the model can not only reasonably reflect the hardening and softening characteristics of sand under drainage or undrained conditions, Moreover, the cumulative deformation characteristics caused by the rotation of the stress spindle and the non-coaxial characteristics between the strain increment spindle and the stress spindle can be predicted without adding any parameters.
【作者单位】：浙江大学建筑工程学院;浙江大学软弱土与环境土工教育部重点实验室;浙江理工大学机械与自动控制学院;
【分类号】：TU441

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