Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 483-494.doi: 10.13278/j.cnki.jjuese.20200063

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Shear Failure Characteristics of Rock-Like Specimens Containing Joints Under Freezing-Thawing Cycles

Xu Xinmu1, Zhang Yaoping1, Fu Yuhua1, Lei Daxing2, Zou Xionggang1   

  1. 1. College of Applied Science, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
    2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China
  • Received:2020-03-14 Online:2021-03-26 Published:2021-04-06
  • Supported by:
    Supported by the National Natural Science Foundation of China(51464015) and the Science and Technology Research Project of Education Department of Jiangxi Province(GJJ191605)

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Abstract: The shear experiments were conducted to investigate the effect of different persistency and freezing-thawing cycles on the shear failure mechanism of the joint specimens. The attenuation trend of shear strength of the joint specimens was compared and analyzed, and the change law of cohesion and friction angle with the fractal dimension of shear failure surface was obtained. The results showed that the peak shear stress decreased significantly with the increase of freezing-thawing cycles; the cohesion and friction angle also deteriorated significantly with the increase of freezing-thawing cycles, and the degree of deterioration gradually increased with the increase of persistency; When the joint persistency was constant, the fractal dimension of the shear failure surface showed an exponentially increasing trend with the increase of freezing-thawing cycles; With the fractal dimension increase, the cohesion and friction angle damage factors of joint specimens also showed an exponential trend; When the freezing-thawing cycles were constant, the friction angle damage factor decreased first and then increased with the increase of joint persistency, while the cohesive damage factor increased and decreased first and then increased before and after around 30 times of freezing-thawing cycles.

Key words: joint, freezing-thawing cycle, connectivity, friction angle, cohesion, fractal dimension

CLC Number: 

  • P58
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