摘要
基于能反映岩石破坏后仍具有残余强度特征的新型损伤模型,引进统计损伤理论,考虑损伤阈值的影响,分别采用Lade-Duncan准则和Drucker-Prager准则对岩石微元强度进行合理度量,建立岩石统计损伤本构模型。理论曲线与试验曲线的对比分析表明了所建模型的合理性。针对基于Drucker-Prager准则建立的岩石统计损伤本构模型不能有效反映损伤阈值,通过对岩石损伤演化规律的分析,对该模型进行了修正。最后通过对两种模型的对比分析,确定了模型的合理应用范围。
A statistical damage constitutive model was established by statistical damage theory,based on the modified damage model reflecting the characteristics of residual strength after failure.Taking damage threshold value into account,this model respectively used Lade-Duncan criterion and Drucker-Prager criterion for the reasonable measurement of rock micro strength.Compared the results obtained from the triaxial tests and the statistical model,the proposed constitutive models were proved to be reasonable.According to the fact that the model couldn＇t effectively figure out damage threshold value,the statistical damage constitutive model based on Drucker-Prager criterion was modified by analyzing the development of rock damage.Finally,with the comparative analysis of the two models,the reasonable scope of each model was determined.
出处
《矿业研究与开发》
CAS
北大核心
2015年第12期101-105,共5页
Mining Research and Development
基金
"十二五"国家科技支撑计划项目(2012BABO1B04)
