A damage constitutive model for sand based on the analysis of the sliding of skeleton grains

XU Hui; ZHANG Guang-yong; WANG Jing-tao

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A damage constitutive model for sand based on the analysis of the sliding of skeleton grains

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- A damage constitutive model for sand based on the analysis of the sliding of skeleton grains
- Vol. 28, Issue S1, (2007)
- 作者机构：
  
  华中科技大学土木工程与力学学院,武汉,430074
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU431
- Online First：28 March 2014，
  
  Published：2007
- 稿件说明：
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XU Hui, ZHANG Guang-yong, WANG Jing-tao. A damage constitutive model for sand based on the analysis of the sliding of skeleton grains[J]. 2007, 28(S1).
DOI：

XU Hui, ZHANG Guang-yong, WANG Jing-tao. A damage constitutive model for sand based on the analysis of the sliding of skeleton grains[J]. 2007, 28(S1). DOI：

摘要

黏土的变形主要受土颗粒之间的联结方式控制，将土颗粒之间的联结方式分为完善联结和滑动联结。在弹性变形阶段，颗粒之间的联结为完善联结，随着剪应力的增大，骨架中一部分完善联结逐渐变成滑动联结，这种转变即为损伤的演化。骨架的损伤和破坏遵循Mohr-Coulomb准则，在p-q平面中以应力点到初始损伤线和破坏线的相对距离表示损伤比，给出了一种描述骨架损伤和计算损伤演化的方法，进而提出了一种描述黏土在不排水条件下剪切变形的损伤本构模型。模型中的参数可根据常规三轴压缩试验确定，模型的形式简单，可适用于复杂的应力路径情况。对试验结果的拟合表明，该模型能较好地反映黏土在不排水条件下的剪切变形特征。

Abstract

The deformation of clay is controlled by the contact between grains which is classified as perfect contact and sliding contact in this paper. In the elastic deformation phase

the contact between grains is regarded as perfect contact. With the increase in shear stress

there are gradual conversions from perfect contacts to sliding contacts which are viewed as damages in this paper. Based on Mohr-Coulomb law

a calculation method for the damage ratio is given according to the relative distance of the stress point to the initial damage line and failure line. On this basis

a damage constitutive model is proposed. The model properties can be simply obtained through the conventional triaxial compression test. Consolidated-undrained test results indicate that the model is capable of predicting the shear deformation behavior of clay under various conditions

including varying hydrostatic stresses and stress paths.

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