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A direction-dependent shear strength criterion for rock joints with two new roughness parameters

  • Liren Ban
  • Chengzhi Qi
  • Chunsheng Lu
Original Paper
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Abstract

The surface morphology of a rock joint is closely related to its mechanical properties. To reasonably characterize a rock surface, two new roughness parameters were proposed in this paper. One is related to the average slope angle of asperities that contribute to the shear strength, and the other reflects the frictional behavior of asperities that is defined as the maximum possible contact area in the shear direction. Taking the standard joint roughness coefficient profiles as example, these two roughness parameters can be applied to describe the directional characteristics of shear strength. Based on their relationships with initial dilation angles, the proposed roughness parameters were incorporated into a peak shear strength criterion. It is shown that the predicted peak shear strength is consistent with experimental data, and there is a power–law relationship. The application range of new roughness parameters was determined, which may facilitate a measurement process.

Keywords

Rock joints Rectangular-shaped asperities Rock surface morphology Roughness parameters 
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Notes

Funding information

This work was supported by the National Key Basic Research Program of China (973) (Project No. 802015CB575) and the National Natural Science Foundation of China (Project Nos. 51478027 and 51774018). C. Lu is supported by the Open Fund of State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing) (Project No. SKLGDUEK1516).

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.School of Mechanics and Civil EngineeringChina University of Mining & Technology (Beijing)BeijingChina
  2. 2.Beijing Future Urban Design High-Tech Innovation Center and 2011 Energy Conservation and Emission Reduction Collaborative Innovation CenterBeijing University of Civil Engineering and ArchitectureBeijingChina
  3. 3.School of Civil and Mechanical EngineeringCurtin UniversityPerthAustralia

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