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Article

Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface

by 1,2, 1, 3,* and 4
1
School of Engineering, China University of Geosciences, Wuhan 430074, China
2
Guizhou Geological and Mineral Foundation Engineering Co., Ltd., Guiyang 550022, China
3
No. 105 Geological Party, Guizhou Bureau of Geology and Mineral Exploration & Development, Guiyang 550018, China
4
Key Laboratory of Karst Georesources and Environment, Ministry of Education, College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
*
Author to whom correspondence should be addressed.
Academic Editors: Victor Calo, Reza Rezaee and Jianchao Cai
Energies 2021, 14(21), 6902; https://doi.org/10.3390/en14216902
Received: 8 August 2021 / Revised: 26 September 2021 / Accepted: 8 October 2021 / Published: 21 October 2021
Roughness is an important factor affecting the engineering stability of jointed rock masses. The existing roughness evaluation methods are all based on a uniform sampling interval, which changes the geometrical morphology of the original profile and inevitably ignores the influence of secondary fluctuations on the roughness. Based on the point cloud data obtained by 3D laser scanning, a non-equal interval sampling method and an equation for determining the sampling frequency on the roughness profile are proposed. The results show that the non-equal interval sampling method can successfully maintain the morphological characteristics of the original profile and reduce the data processing cost. Additionally, direct shear tests under constant normal load (CNL) conditions are carried out to study the influence of roughness anisotropy on the shear failure mechanism of joint surfaces. It is found that with the increase in shear displacement, the variations in the shear stress are related to the failure mechanisms of dilatancy and shear fracture of the joint. Finally, the distributions of shear stress, dilatancy and fracture areas on the rough joint in different shear directions are calculated theoretically. Results show that the anisotropy and failure mechanism of rough joint can be well characterized by the modified root mean square parameter Z2′. View Full-Text
Keywords: rock joint; surface roughness; sampling interval effect; roughness anisotropy; shear failure mode rock joint; surface roughness; sampling interval effect; roughness anisotropy; shear failure mode
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MDPI and ACS Style

Chen, F.; Yu, H.; Yang, Y.; Wu, D. Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface. Energies 2021, 14, 6902. https://doi.org/10.3390/en14216902

AMA Style

Chen F, Yu H, Yang Y, Wu D. Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface. Energies. 2021; 14(21):6902. https://doi.org/10.3390/en14216902

Chicago/Turabian Style

Chen, Fan, Hongming Yu, Yilin Yang, and Daoyong Wu. 2021. "Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface" Energies 14, no. 21: 6902. https://doi.org/10.3390/en14216902

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