摘要
通过在扫描电镜下进行单轴加载实验，即时观察分析岩石受力过程中微裂纹的萌生、扩展和贯通破坏的全过程，得到各试样的应力应变曲线及其所对应的微结构变化的电镜照片·实验结果表明，岩石试件的变形与破坏过程可以分为裂纹压密、微裂纹萌生和扩展以及断裂破坏３ 个阶段；微裂缝首先在预裂缝周围的拉应力集中区产生，随着外载荷的增加不断扩展，最后形成与最大主应力方向平行的宏观断裂带·
The whole process from the initiation,propagation to coalescence of microcracks in rock specimen under uniaxial compression was observed real timely by using SEM. The stress strain curves as well as SEM photos were also recorded corresponding to different stages of the failure process. The experimental results indicate that the failure process of rock can be divided into 3 stages:initiation,propagation of micro crack and macroscopic failure. The micro cracks initiate at the high stress zone around the preexisted cracks,propagate along with the increase of outer load,and at last form the macroscopic fracture zone at the direction of maximum principal stress. The results also show that the failure characteristics during the whole processes of rock specimens are extremely influenced by the meso scopic heterogeneity of rock,and the rock specimens are basically caused by tensile cracks.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第4期426-429,共4页
Journal of Northeastern University(Natural Science)
基金
国家杰出青年科学基金
中国科学院力学所非线性连续介质力学开放实验室资助
关键词
单轴压缩实验
预裂纹
失稳过程
岩石
破坏失稳
uniaxial compression experiment,preexisted crack,instability process,heterogeneity.
