基于非线性动态强度准则的岩石动态变形过程统计损伤模拟方法  

A statistical damage simulation method of dynamic deformation process for rocks based on nonlinear dynamic strength criterion

作　　者：曹文贵[1] 林星涛 张超[1] 杨尚[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《岩石力学与工程学报》2017年第4期794-802,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51378198);高等学校博士学科点专项科研基金资助项目(20130161110017)~~

摘　　要：岩石动态应变率对岩石动态变形过程具有极其重要的影响,因此,首先考虑岩石动态应变率对岩石强度的非线性影响特点,通过对现有岩石动态强度准则进行改进,建立反映应变率影响的非线性岩石动态强度准则,为岩石动态变形过程模拟方法研究奠定了坚实的基础;然后,采用本文非线性动态强度准则,在重点探讨考虑应变率影响的岩石微元强度度量方法基础上,引入统计损伤理论建立岩石动态统计损伤本构模型,并提出基于岩石动三轴试验曲线的模型参数确定方法,进而建立岩石动态变形过程模拟方法。它不仅能反映应力状态而且能反映应变率对岩石变形过程的影响;最后,通过与现有同类模型理论曲线以及相应试验曲线的比较分析,表明了提出模型与方法的合理性与优越性。The dynamic strain rate has a great effect on the dynamic deformation process of rocks. Considering the nonlinear effect of dynamic strain rate of rocks on their strength, a nonlinear dynamic strength criterion reflecting the influence of strain rate was developed based on the improvement to the existing dynamic strength criterions of rocks. With the nonlinear dynamic strength criterion proposed and the measurement method of the microelement strength considering the effect of the strain rate of rocks, a dynamic statistical damage constitutive model for rocks was proposed based on the statistical damage theory. A method for determining the model parameters based on the dynamic stress-strain curves from the dynamic triaxial test of rocks was also put forward. A method simulating the dynamic deformation process of rocks was established, which reflect the influence of not only stress state but also strain rate on the dynamic deformation process of rocks. Finally, a comparison between the experimental and theoretical curves of this model and other existing similar models was carried out and the rationality and advantage of the proposed model in this paper were demonstrated.

关 键 词：岩石力学 非线性动态强度准则 应变率 统计损伤 动态本构模型 

分 类 号：TU45[建筑科学—岩土工程]