›› 2015, Vol. 36 ›› Issue (3): 703-710.doi: 10.16285/j.rsm.2015.03.014

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Shear strength research on rock joint surfaces based on multifractal theory

CHEN Shi-jiang1,2，ZHU Wan-cheng1, YU Qing-lei1，WANG Qing-yuan1   

  1. 1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, Liaoning 110819, China; 2. Institute of Mining Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China
  • Received:2014-09-10 Online:2015-03-11 Published:2018-06-13

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Abstract: The Barton’s shear strength criterion is widely used in engineering practice. However, the estimation of joint surface roughness coefficient (JRC) is subjective and one-sided in this method. Therefore, a method is proposed to estimate JRC with multifractal parameters based on multifractal theory. Firstly, 3D data of joint surface are obtained with digital image processing (DIP) technique. Secondly, the fractal dimension of surface is calculated with the projective covering method (PCM). Particularly the multifractal parameters of fifteen joint surfaces are computed. The results show that the rougher the surface, the larger the parameters of and . Both multifractal parameters and can well describe the morphology of joint surface. At last, nine groups of gypsum specimens are used for direct shear tests under different normal stresses. The relationship between the multifractal parameters and the JRC is examined with the principle of least square method according to the experimental data of shear strength. Thus, the JRC can be estimated accurately using parameters of and . The results provide a new approach to study surface roughness of rock joints. On the basis, the shear strength of rock joints can be accurately estimated.

Key words: joint surface, shear strength, multifractal, digital image processing (DIP) technique

CLC Number: 

  • TU 452
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