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Geomechanics and Engineering
  Volume 28, Number 2, January25 2022 , pages 181-195
DOI: https://doi.org/10.12989/gae.2022.28.2.181
 


An experimental study on triaxial failure mechanical behavior of jointed specimens with different JRC
Wen-Ling Tian, Sheng-Qi Yang, Jin-Peng Dong, Jian-Long Cheng and Jia-wei Lu

 
Abstract
    Roughness and joint inclination angle are the important factors that affect the strength and deformation characteristics of jointed rock mass. In this paper, 3D printer has been employed to make molds firstly, and casting the jointed specimens with different joint roughness coefficient (JRC), and different joint inclination angle (a). Conventional triaxial compression tests were carried out on the jointed specimens, and the influence of JRC on the strength and deformation parameters was analyzed. At the same time, acoustic emission (AE) testing system has been adopted to reveal the AE characteristic of the jointed specimens in the process of triaxial compression. Finally, the morphological of the joint surface was observed by digital three-dimensional video microscopy system, and the relationship between the peak strength and JRC under different confining pressures has been discussed. The results indicate that the existence of joint results in a significant reduction in the strength of the joint specimen, JRC also has great influence on the morphology, quantity and spatial distribution characteristics of cracks. With the increase of JRC, the triaxial compressive strength increase, and the specimen will change from brittle failure to ductile failure.
 
Key Words
    joint inclination angle; joint roughness coefficient; morphology; rock mechanics; triaxial compression
 
Address
Wen-Ling Tian, Sheng-Qi Yang, Jin-Peng Dong and Jia-wei Lu: State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering,
China University of Mining and Technology, Xuzhou 221116, P.R. China
Jian-Long Cheng: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology,
Chengdu 610059, China
 

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