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《JOURNAL OF NORTHEASTERN UNIVERSITY(NATURAL SCIENCE)》 1999-04
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Real Time SEM Study on Rock Failure Instability Under Uniaxial Compression

Huang Mingli,Tang Chunan,Zhu Wancheng (School of Resource and Civil Engineering,Northeastern University, Shenyang 110006,China)  
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.
【Fund】: 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
【CateGory Index】: TD315
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