Study of rate-dependence and hardening-softening characteristics of rock and soil material

WANG Xiao-ping; XIA Xiong

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Study of rate-dependence and hardening-softening characteristics of rock and soil material

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- Study of rate-dependence and hardening-softening characteristics of rock and soil material
- Vol. 32, Issue 11, (2011)
- 作者机构：
  
  常州大学岩土工程研究所,江苏,常州,213164
- 作者简介：
- 基金信息：
- DOI：
  CLC： O345
- Online First：09 November 2011，
  
  Published：2011
- 稿件说明：
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WANG Xiao-ping, XIA Xiong. Study of rate-dependence and hardening-softening characteristics of rock and soil material[J]. 2011, 32(11).
DOI：

WANG Xiao-ping, XIA Xiong. Study of rate-dependence and hardening-softening characteristics of rock and soil material[J]. 2011, 32(11). DOI：

摘要

岩土类材料具有显著的率相关性，其应力-应变关系全过程一般表现为硬化-软化特征，研究如何描述这两类特征具有重要的意义。基于岩土类材料的物理变形机制分析，考虑到其结构性特征，采用弹黏塑性本构模型，引入反映材料结构变化的可变结构黏滞系数及其演化方程，并将其嵌入到弹黏塑性本构模型中去，建立能够反映材料结构变化的弹黏塑性本构模型。利用玄武岩常规三轴常应变率试验结果对所建立的模型进行试验验证，结果表明：所建立的弹黏塑本构模型能够完整、合理地描述岩土类材料应力-应变关系全过程以及材料本构关系的率相关性，同时还能够反映材料的峰值强度、残余强度特征。

Abstract

Rock and soil material has strong rate dependence; its complete stress-strain relation belongs to the type of hardening-softening

It is important to describe these two characteristics. Based on the analysis of physical deformation mechanism

considering the structure characteristic

the elasto-viscoplastic model is used. To set up the elasto-viscoplastic model which can describe the structure changes

the variable viscosity coefficients and its evolution equation are applied to the elasto-viscoplastic model. The result of basalt normal triaxial constant rate test is used to test the rationality of the model. The result shows that the model can completely and rationally describe the complete stress-strain relation and its rate dependence

and also the peak strength

residual strength characteristic

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