Numerical Analysis of Joint Rock Shear Properties Considering Joint Geometrical Characters

Abstract:

The purpose of this paper is to study the shear behavior of rock specimens containing joints with various distribution forms. Two sets of specimens are simulated by the rock failure process analysis code (RFPA2D). The friction-sliding failure pattern occurs with the lower undulation angle specimen, and the failure pattern turns to be tensile-shear failure mode gradually with the increase of undulation angle. The specimen possesses the highest peak shear load when the undulation angle is about 30º. And joint rock shear character also deteriorates with the increase of weak interlayer thickness. In the intermittent joint model, the unified connection ratio specimen’s peak shear load increases with rock bridge amount, and the multi-joint mode is beneficial to keep rock mass shear stiffness. This study comes to meaningful results to the expansion of joint rock strength evolution law with various joint distribution forms.

• Periodical: Applied Mechanics and Materials (Volumes 29-32)
• Pages: 149-154
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.29-32.149
• Online since: August 2010
• Authors: Qiang Zhang, Xiu Run Ge, Shui Lin Wang
• Keywords: Direct Shear Test, Joint Distribution Form, Numerical Study, Rock Joints, Undulation Angle

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