Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface
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 fluc...
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MDPI AG
2021
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oai:doaj.org-article:5921c244324a4c2fac5d09b607fc19942021-11-11T15:44:33ZInfluences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface10.3390/en142169021996-1073https://doaj.org/article/5921c244324a4c2fac5d09b607fc19942021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6902https://doaj.org/toc/1996-1073Roughness 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 Z<sub>2</sub>′.Fan ChenHongming YuYilin YangDaoyong WuMDPI AGarticlerock jointsurface roughnesssampling interval effectroughness anisotropyshear failure modeTechnologyTENEnergies, Vol 14, Iss 6902, p 6902 (2021) |
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rock joint surface roughness sampling interval effect roughness anisotropy shear failure mode Technology T |
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rock joint surface roughness sampling interval effect roughness anisotropy shear failure mode Technology T Fan Chen Hongming Yu Yilin Yang Daoyong Wu Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface |
| description |
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 Z<sub>2</sub>′. |
| format |
article |
| author |
Fan Chen Hongming Yu Yilin Yang Daoyong Wu |
| author_facet |
Fan Chen Hongming Yu Yilin Yang Daoyong Wu |
| author_sort |
Fan Chen |
| title |
Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface |
| title_short |
Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface |
| title_full |
Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface |
| title_fullStr |
Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface |
| title_full_unstemmed |
Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface |
| title_sort |
influences of roughness sampling interval and anisotropy on shear failure mechanism of rock joint surface |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/5921c244324a4c2fac5d09b607fc1994 |
| work_keys_str_mv |
AT fanchen influencesofroughnesssamplingintervalandanisotropyonshearfailuremechanismofrockjointsurface AT hongmingyu influencesofroughnesssamplingintervalandanisotropyonshearfailuremechanismofrockjointsurface AT yilinyang influencesofroughnesssamplingintervalandanisotropyonshearfailuremechanismofrockjointsurface AT daoyongwu influencesofroughnesssamplingintervalandanisotropyonshearfailuremechanismofrockjointsurface |
| _version_ |
1718434084994154496 |