摘要
针对岩石的动态变形特征,引进Kelvin模型,采用粘性元件和弹塑性元件模型并联的方法,建立岩石单轴压缩的受力分析模型,以此反映加载速度或应变率对岩石动态变形特性的影响.通过探讨岩石动态变形过程的体积变化影响,引进统计损伤理论,建立弹塑性体损伤统计本构模型.进而建立可反映加载速度或应变率影响的单轴受压岩石统计损伤本构模型,并提出其参数确定方法.实例分析表明:该模型不仅能反映岩石强度和弹性模量或刚度随应变率提高而增加的特性,而且能较好地模拟单轴受压岩石的动态变形过程,具有一定的合理性.
Considering the dynamic deformation characteristic of rock and introducing the Kelvin model formed by a viscous element and a paralleled elastoplastic element, a mechanical analysis model of uniaxial compressed rock was established to reflect the influence of the strain rate on the dynamic deformation characteristic of rock. Then, by discussing the influences of volume change and introducing statistical damage theory and establishing statistical damage constitutive model for elastoplastic element, a statistical damage constitutive model for uniaxial compressed rock was established with consideration of strain rate. The corresponding method to determine parameters was proposed as well. Finally, the analysis and the discussion of the practical example have indicated that the constitutive model can not only reflect the characteristic of the strength and the elastic module （or stiffness） of rock growing with strain rate increase, but can also simulate the dynamic deformation process of uniaxial compressed rock, so the constitutive model presented is reasonable.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第8期14-18,共5页
Journal of Hunan University:Natural Sciences
基金
国家863计划资助项目(2006AA11Z104)
国家自然科学基金资助项目(50378036)
关键词
岩石力学
应变率
粘弹塑性
统计损伤
本构模型
rock mechanics
strain rate
visco-elastoplastic
statistical damage
constitutive model
