摘要
利用服从Weibull分布的岩石微元强度表示方法,基于Drucker-Prager破坏准则,通过引入损伤变量的修正系数,利用应力-应变关系曲线峰值点处的应力、应变确定Weibull分布参数的关系式,建立不同围压下的损伤软化本构模型。该模型参数较少且易于确定,其参数的确定方法揭示了模型参数的物理意义。与前人的研究成果进行对比分析,结果表明该模型比未修正前有着明显的优越性,且与实测结果吻合较好,分析结果显示出该模型的合理性。
Using a rock micro-unit strength,which satisfies the Weibull random distribution and is based on the Drucker-Prager failure criterion,a correction coefficient for damage variables is introduced,which reflects the full stress-strain process and residual strength of rock.The relationship between Weibull distribution parameters under different confining pressures is established using the stress and strain at peak points on the stress-strain curve.A damage softening constitutive model of rock is then established,accounting for the rock triaxial stress-strain test curve.The model has few parameters,and the way of determining the parameters indicates the physical meaning of the model parameters.Compared with previous studies,this model,after modification,has obvious advantages.The rationality of the model proposed here is demonstrated using comparative analysis between the theoretical and experimental results.
出处
《地震工程学报》
CSCD
北大核心
2016年第5期783-786,共4页
China Earthquake Engineering Journal
关键词
岩石
损伤
软化
修正
本构模型
rock
damage
softening
modified
constitutive model
