摘要
基于统计理论和损伤力学对岩石在荷载作用下的破坏、损伤特征进行了探讨,建立了弹性损伤统计本构模型。在损伤演化方程中全部采用有效应力,并能反映岩石剩余强度。在混合物理论基础上,建立了饱和、非饱和岩石损伤软化统计本构模型。该模型能反映岩石在单轴抗压试验中初始加载阶段全应力-应变曲线稍向上凹曲的特征,以及在岩石受力过程中损伤和空隙(或孔隙)中流体对应力-应变关系所起的作用。与试验结果的比较显示模型是合理的。
Based on probability statistics and damage mechanicst,he characteristics of failure and damage of rock are studied,and the statistical damage constitutive model of rock is developed.For stresses,only effective stresses are employed in the damage evolvement function.The residual strength property of rock can be considered in the model.Then the statistical damage constitutive model is developed for saturated and unsaturated rock based on the mixture theory.The model can reflect the segment of concave in the stress-strain curve at the initial loading phase in the uniaxial compression test of rock,and the influence of damage in compression process and fluid in the pores or void on the stress-stain curves.The presented model is verified to be reasonable and practical in comparison with the experiment data.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第z1期4285-4291,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金(50128908
50374064
50334060)
国家重点基础研究发展规划(973)项目(2002CB412704)资助课题。
关键词
岩石力学
饱和、非饱和岩石
统计
损伤
软化
本构模型
rock mechanics,saturated and unsaturated rock,statistics,damage,softening,constitutive model
