Numerical Experimental Research on Shear Strength of Rock Mass Discontinuity Concerning Roughness

Abstract:

The discontinuity’s surface topography is often assumed as smooth and straight. To overcome non-considering roughness of discontinuity, direct shear numerical experiment is proposed to research influences of discontinuous roughness on its strength. Firstly, based on researched mechanical properties of discontinuity, the laws how asperity inclination angles and asperity heights of discontinuity and the mechanical behavior of discontinuity are studied. The results show that the failure of discontinuity considering roughness is not instantaneous. It is a complex process which goes through energy accumulation. The cohesive force increases with asperity inclination angle and asperity height increasing. The inner friction angle also goes through the same changes. However, when the normal stress reaches 500kPa for asperity inclination angle and 700kPa for asperity height, the shear strength experiences a decreasing process.

• Periodical: Applied Mechanics and Materials (Volume 707)
• Pages: 289-293
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.707.289
• Online since: December 2014
• Authors: Ji Hong Wei*, Yuan Yuan Yang, Xiao Bing Gao
• Keywords: Asperity Inclination Angle(Height), Numerical Experiment, Roughness, Shear Strength

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