Numerical simulations of fracture shear test in anisotropy rocks with bedding layers

Hadi Haeri, Vahab Sarfarazi, Zheming Zhu and Hamid Reza Nejati

Abstract

In this paper the effect of bedding layer on the failure mechanism of rock in direct shear test has been investigated using particle flow code, PFC. For this purpose, firstly calibration of pfc2d was performed using Brazilian tensile strength. Secondly direct shear test consisting bedding layer was simulated numerically. Thickness of layers was 10 mm and rock bridge length was 10 mm, 40 mm and 60 mm. In each rock bridge length, bedding layer angles changes from 0o to 90o with increment of 15o. Totally 21 models were simulated and tested. The results show that two types of cracks develop within the model. Shear cracks and tensile cracks. Also failure pattern is affected by bridge length while shear strength is controlled by failure pattern. It\'s to be noted that bedding layer has not any effect on the failure pattern because the layer interface strength is too high.

Key Words

direct shear test; anisotropy; bedding layer; tensile crack; PFC2D

Address

Hadi Haeri: State Key Laboratory for Deep GeoMechanics and Underground Engineering, Beijing, 100083, China Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Zheming Zhu: MOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China Reza Nejati: Rock Mechanics Division, School of Engineering, Tarbiat Modares University, Iran

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