摘要
结合连续强度理论和统计理论,从岩石内部缺陷分布的随机性出发,建立了岩石统计损伤本构模型。分析结果表明,将岩石破坏准则作为微元强度分布变量建立统计损伤本构模型时,破坏准则的选择对建立的模型曲线和损伤岩石等效弹性模量的影响较大,因此应选取合适的岩石破坏准则。运用岩土工程反演分析方法,求解了本构模型中的统计分布参数,使所得的统计损伤本构模型能够考虑应力状态对模型曲线的影响。与前人理论曲线和试验结果的比较表明,所建立模型合理且具有工程实用价值。
Based on random distribution of interior defect in rock, a statistical damage constitutive model for rock is developed by using the continuous strength theory and statistical theory. Failure criterion of rock, as the distribution variable of the micro-unit strength in the constitutive model, greatly affects stress-strain curve and the equivalent elastic modulus of rock, and it must be chosen carefully for specific rock. By using back analysis method, the statistical distribution parameters in the constitutive model are solved. The proposed model can consider the effect of stress states and reflect the behavior in which the complete stress-strain curve of rock varies with stress-strain state. Comparison of the proposed model and experimental results shows that the proposed model is verified and can be applied in practical engineering.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第4期616-621,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩石力学
岩石
统计
损伤
本构模型
反演
Elastic moduli
Failure (mechanical)
Fracture
Inverse problems
Mathematical models
Statistics
Strain
Stress analysis
