A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients

Joint roughness determination is a fundamental issue in many areas of rock engineering, because joint roughness has significant influences on mechanical properties and deformation behavior of rock masses. Available models suggested in the literature neglected combined effects of shear direction, sca...

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Autores principales:	Huizhen Zhang, Changsuo Zhang, Zejin Yang, Zhiqiang Li, Chenlong Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	novel discontinuity roughness parameter joint roughness coefficients correlation Barton ten standard profiles anisotropy of roughness Technology T
Acceso en línea:	https://doaj.org/article/613d606338874dd19719a13149c4eac3
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spelling	oai:doaj.org-article:613d606338874dd19719a13149c4eac32021-11-25T17:27:24ZA Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients10.3390/en142276311996-1073https://doaj.org/article/613d606338874dd19719a13149c4eac32021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7631https://doaj.org/toc/1996-1073Joint roughness determination is a fundamental issue in many areas of rock engineering, because joint roughness has significant influences on mechanical properties and deformation behavior of rock masses. Available models suggested in the literature neglected combined effects of shear direction, scale of rock discontinuities, inclination angle, and amplitude of asperities during the roughness calculations. The main goals of this paper are to establish a comprehensive parameter that considers the characteristics of the size effect, anisotropy, and point spacing effect of the discontinuity roughness, and to investigate the correlation between the proposed comprehensive parameter and joint roughness coefficients. In this work, the Barton ten standard profiles are digitally represented, then the morphological characteristics of the discontinuity profiles are extracted. A comprehensive parameter that considers the characteristics of the size effect, anisotropy, and point spacing effect of the discontinuity roughness is established, and its correlation with joint roughness coefficients (JRC) is investigated. The correlation between the proposed discontinuity roughness parameter and the joint roughness coefficients can predict the JRC value of the natural discontinuities with high accuracy, which provides tools for comprehensively characterizing the roughness characteristics of rock discontinuities. The roughness index <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>v</mi><mi>h</mi><mo stretchy="false">[</mo><mo>−</mo><msup><mrow><mn>30</mn></mrow><mo>∘</mo></msup><mo>,</mo><mn>0</mn><mo stretchy="false">]</mo></mrow></msub></mrow></semantics></math></inline-formula> reflects the gentle slope characteristics of the rock discontinuity profiles in the shear direction, which ignores the segments with steep slopes greater than 30° on the discontinuity profiles. The influence of steep slope segments greater than 30° should be considered for the roughness anisotropy parameter in the future.Huizhen ZhangChangsuo ZhangZejin YangZhiqiang LiChenlong WangMDPI AGarticlenovel discontinuity roughness parameterjoint roughness coefficientscorrelationBarton ten standard profilesanisotropy of roughnessTechnologyTENEnergies, Vol 14, Iss 7631, p 7631 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	novel discontinuity roughness parameter joint roughness coefficients correlation Barton ten standard profiles anisotropy of roughness Technology T
spellingShingle	novel discontinuity roughness parameter joint roughness coefficients correlation Barton ten standard profiles anisotropy of roughness Technology T Huizhen Zhang Changsuo Zhang Zejin Yang Zhiqiang Li Chenlong Wang A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients
description	Joint roughness determination is a fundamental issue in many areas of rock engineering, because joint roughness has significant influences on mechanical properties and deformation behavior of rock masses. Available models suggested in the literature neglected combined effects of shear direction, scale of rock discontinuities, inclination angle, and amplitude of asperities during the roughness calculations. The main goals of this paper are to establish a comprehensive parameter that considers the characteristics of the size effect, anisotropy, and point spacing effect of the discontinuity roughness, and to investigate the correlation between the proposed comprehensive parameter and joint roughness coefficients. In this work, the Barton ten standard profiles are digitally represented, then the morphological characteristics of the discontinuity profiles are extracted. A comprehensive parameter that considers the characteristics of the size effect, anisotropy, and point spacing effect of the discontinuity roughness is established, and its correlation with joint roughness coefficients (JRC) is investigated. The correlation between the proposed discontinuity roughness parameter and the joint roughness coefficients can predict the JRC value of the natural discontinuities with high accuracy, which provides tools for comprehensively characterizing the roughness characteristics of rock discontinuities. The roughness index <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>v</mi><mi>h</mi><mo stretchy="false">[</mo><mo>−</mo><msup><mrow><mn>30</mn></mrow><mo>∘</mo></msup><mo>,</mo><mn>0</mn><mo stretchy="false">]</mo></mrow></msub></mrow></semantics></math></inline-formula> reflects the gentle slope characteristics of the rock discontinuity profiles in the shear direction, which ignores the segments with steep slopes greater than 30° on the discontinuity profiles. The influence of steep slope segments greater than 30° should be considered for the roughness anisotropy parameter in the future.
format	article
author	Huizhen Zhang Changsuo Zhang Zejin Yang Zhiqiang Li Chenlong Wang
author_facet	Huizhen Zhang Changsuo Zhang Zejin Yang Zhiqiang Li Chenlong Wang
author_sort	Huizhen Zhang
title	A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients
title_short	A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients
title_full	A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients
title_fullStr	A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients
title_full_unstemmed	A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients
title_sort	novel discontinuity roughness parameter and its correlation with joint roughness coefficients
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/613d606338874dd19719a13149c4eac3
work_keys_str_mv	AT huizhenzhang anoveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT changsuozhang anoveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT zejinyang anoveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT zhiqiangli anoveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT chenlongwang anoveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT huizhenzhang noveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT changsuozhang noveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT zejinyang noveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT zhiqiangli noveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients AT chenlongwang noveldiscontinuityroughnessparameteranditscorrelationwithjointroughnesscoefficients
_version_	1718412353351974912

A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients

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