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Smart Structures and Systems
  Volume 22, Number 4, October 2018 , pages 459-468

Numerical simulation of shear mechanism of concrete specimens containing two coplanar flaws under biaxial loading
Vahab Sarfarazi, Hadi Haeri and Kourosh Bagheri

     In this paper, the effect of non-persistent joints was determined on the behavior of concrete specimens subjected to biaxial loading through numerical modeling using particle flow code in two dimensions (PFC2D). Firstly, a numerical model was calibrated by uniaxial, Brazilian and triaxial experimental results to ensure the conformity of the simulated numerical model\'s response. Secondly, sixteen rectangular models with dimension of 100 mm by 100 mm were developed. Each model contains two non-persistent joints with lengths of 40 mm and 20 mm, respectively. The angularity of the larger joint changes from 30 to 90. In each configuration, the small joint angularity changes from 0 to 90 in 30 increments. All of the models were under confining stress of 1 MPa. By using of the biaxial test configuration, the failure process was visually observed. Discrete element simulations demonstrated that macro shear fractures in models are because of microscopic tensile breakage of a large number of bonded discs. The failure pattern in Rock Bridge is mostly affected by joint overlapping whereas the biaxial strength is closely related to the failure pattern.
Key Words
     rock bridge; non-persistent joint; PFC2D
Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
Hadi Haeri: Young Researchers and Elite Club, Bafgh Branch, Islamic Azad University, Bafgh, Iran
Kourosh Bagheri: Department of civil engineering, Malard Branch, Islamic Azad University, Malard, Iran

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