三维高静载频繁动态扰动时岩石损伤特性及本构模型

发布时间：2018-02-15 22:57

本文关键词： 深部岩石三维高静载频繁动态扰动损伤特性本构模型　出处：《岩土力学》2017年08期 　论文类型：期刊论文

【摘要】：采用改进的SHPB试验装置,进行深部岩石的三维高静载频繁动态扰动试验,分析动态应力-应变曲线的一般特征,可将其细分为微裂纹稳定发展、微裂纹非稳定发展、疲劳损伤、疲劳破坏4个阶段进行描述,其中峰值后的2个阶段处于动态应力卸载过程。基于连续因子、应变等效原理及统计损伤理论定义岩石的损伤变量并推演损伤演化方程,采用组合模型法建立岩石的本构模型。结合试验数据,验证岩石的损伤演化规律及建立的本构模型,结果表明:利用推演的损伤演化方程计算出损伤变量,其与动态应变的关系曲线符合试验中岩样的损伤规律;建立本构方程的拟合曲线与试验曲线具有较好的一致性,说明建立的本构模型可以用来预测深部岩石处于三维高静载频繁动态扰动时的动力学特性。
[Abstract]:By using the improved SHPB test device, the frequent dynamic disturbance test of three dimensional Gao Jing loading on deep rock is carried out, and the general characteristics of dynamic stress-strain curve are analyzed, which can be subdivided into microcrack stable development, micro-crack unsteady development and fatigue damage. The four stages of fatigue failure are described, in which the two phases after the peak are in the dynamic stress unloading process. Based on the continuum factor, the strain equivalent principle and the statistical damage theory, the damage variables of rock are defined and the damage evolution equation is derived. Combined with the experimental data, the damage evolution law and constitutive model of rock are verified. The results show that the damage variable is calculated by using the derived damage evolution equation. The curve of relationship with dynamic strain accords with the damage law of rock samples in the test, and the fitting curve of the constitutive equation is in good agreement with the test curve. It is concluded that the constitutive model can be used to predict the dynamic characteristics of deep rocks under the frequent dynamic disturbances of three dimensional Gao Jing.
【作者单位】：河南理工大学能源科学与工程学院;中南大学资源与安全工程学院;
【基金】：国家自然科学基金资助项目(No.51474250) 国家重点基础研究发展计划(973)资助项目(No.2010CB732004)~~
【分类号】：TU45

【相似文献】