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Effect of the shear loading direction on shear behavior of rock and finding new empirical method for determining JRC by fractal dimension

Khosravi, A ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. Publisher: 2007
  3. Abstract:
  4. Effect of different conditions on shear behaviour of rock has been investigated by various researchers. As known, in larger scale the continuity of the rock material is interrupted by separated planes such as bedding planes, faults, shear zones, closure and the behaviour converts to be inelastic and anisotropic. Generally, discontinuities appear repeatedly in more than one preferential direction, creating a three dimensional structure, reducing its stiffness and shear strength as mechanical effects and increasing its transport velocity associated with discontinuity flow as hydraulic effects. They also make rock behavior more complex and different compared to the behavior of soil. According to the three dimensional structure of rock mass, the direction of shear loading can be different in respect with the direction of surface roughness and it can be a specific parameter in shear behavior of rock. In this paper, the aim is to investigate the effects of the direction of roughness in respect with the direction of shear loading in different conditions of normal loading and rough angles and find a new method for determining JRC as an important parameter in Barton's criterion. This is done by using simple shear tests on the artificial joint, with regular saw-teeth roughness profile conducted under CNL Condition at different normal loads on the gypsies' samples with 30*30 cm dimension made in different surface roughness conditions. Results showed that the direction of shear loading makes serious changes in shear behavior of rock and increasing it reduces its shear strength. On the other hand, by using fractal dimension, a new method was found for determining JRC using in Barton's criterion
  5. Keywords:
  6. Fractal dimension ; Parameter estimation ; Shear strength ; Surface roughness ; Shear loading ; Shear tests ; Rocks
  7. Source: Annual Conference of the Canadian Society for Civil Engineering 2007: Where the Road Ends, Ingenuity Begins, Yellowknife, NT, 6 June 2007 through 9 June 2007 ; Volume 1 , 2007 , Pages 259-267
  8. URL: http://www.proceedings.com/01574.html