Study on deformation failure and crack propagation mechanism of prefabricated end joint rock bridge under uniaxial compression

The rock bridge in the slope rock mass has a controlling effect on the slope stability. In order to explore the deformation and failure characteristics and crack expansion mechanism of the jointed rock bridge, in this paper, the crack initiation, propagation, penetration and microscopic damage evolu...

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Bibliographic Details
Published inMei kuang an quan Vol. 52; no. 9; pp. 78 - 84
Main Authors ZHANG Haidong, CHEN Yongfeng, ZHAO Guangchen, ZHANG Qinghua
Format Journal Article
LanguageChinese
Published Editorial Office of Safety in Coal Mines 01.09.2021
Subjects
crack propagation
deformation failure
digital image
initiation angle
rock bridge
slope rock mass
stress intensity factor
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Summary:The rock bridge in the slope rock mass has a controlling effect on the slope stability. In order to explore the deformation and failure characteristics and crack expansion mechanism of the jointed rock bridge, in this paper, the crack initiation, propagation, penetration and microscopic damage evolution characteristics of rock bridge are analyzed by prefabricating cracks at the end of complete specimen to form middle rock bridge combined with digital image correlation technology. The crack initiation, propagation and penetration mechanism of rock bridge is revealed by using the theory of fracture mechanics. The results show that the fracture process of rock bridge specimen can be divided into five stages and the strain-strain curve shows the characteristics of “pre-peak fluctuation” and “post-peak step” decline. The failure process of the rock bridge specimen is as follows: first, the crack initiation of the lower inclined crack, and then the deflection extends upward at a certain angle, and the crack expansi
ISSN:1003-496X
DOI:10.13347/j.cnki.mkaq.2021.09.013