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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| Format: | Article |
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MDPI AG
2021-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/22/7631 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T05:32:30Z |
| format | Article |
| id | doaj.art-613d606338874dd19719a13149c4eac3 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T05:32:30Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-613d606338874dd19719a13149c4eac32023-11-22T23:11:06ZengMDPI AGEnergies1996-10732021-11-011422763110.3390/en14227631A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness CoefficientsHuizhen Zhang0Changsuo Zhang1Zejin Yang2Zhiqiang Li3Chenlong Wang4Shanxi College of Technology, Shuozhou 036012, Shanxi, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, ChinaCollege of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, ChinaCollege of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, ChinaJoint 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.https://www.mdpi.com/1996-1073/14/22/7631novel discontinuity roughness parameterjoint roughness coefficientscorrelationBarton ten standard profilesanisotropy of roughness |
| spellingShingle | Huizhen Zhang Changsuo Zhang Zejin Yang Zhiqiang Li Chenlong Wang A Novel Discontinuity Roughness Parameter and Its Correlation with Joint Roughness Coefficients Energies novel discontinuity roughness parameter joint roughness coefficients correlation Barton ten standard profiles anisotropy of roughness |
| title | 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_short | 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 |
| topic | novel discontinuity roughness parameter joint roughness coefficients correlation Barton ten standard profiles anisotropy of roughness |
| url | https://www.mdpi.com/1996-1073/14/22/7631 |
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