摘要
岩石被视为包含有随机分布、无充填的椭球形微裂纹的各向同性体,岩石变形分解为岩石母体的线弹性变形和微裂纹的变形之和。基于压剪裂纹模型,推导了岩石在三轴卸荷过程中微裂纹的变形,从而建立了一种岩石三轴卸荷的本构模型。一组石膏模型的三轴实验结果显示,实验数据与理论计算结果能基本吻合。
Based on the linear elastic fracture mechanics theory, a constitutive model of rock with microcracks under triaxial loading and unloading is developed. In the developed model, rock is assumed to be made of homogeneous, isotropic, linear elastic material containing a lot of random ellipse-shaped microcracks. The deformation of rock is decomposed of the deformations of rock matrix and microcracks. The calculation formulae of microcrack deformation are given. In order to check the proposed theoretical model, the testing study is made for gypsum model. The testing results are well consistent with theoretical predictions.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第5期626-631,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
重庆市科学基金(2000-01)和重庆市教委科技基金(2000-03)联合资助项目。
关键词
岩石
本构模型
三轴卸荷
Deformation
Fracture mechanics
Mathematical models
Microcracks
