A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength
The joint roughness coefficient (JRC) is an important factor affecting the shear properties of rock joints, and its accurate estimation is a challenging task in rock engineering. Existing JRC evaluation approaches such as the empirical comparison method and the statistical parameter method have some...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/7897529 |
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| _version_ | 1832561983916867584 |
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| author | Jiu-yang Huan Ming-ming He Zhi-qiang Zhang Ning Li |
| author_facet | Jiu-yang Huan Ming-ming He Zhi-qiang Zhang Ning Li |
| author_sort | Jiu-yang Huan |
| collection | DOAJ |
| description | The joint roughness coefficient (JRC) is an important factor affecting the shear properties of rock joints, and its accurate estimation is a challenging task in rock engineering. Existing JRC evaluation approaches such as the empirical comparison method and the statistical parameter method have some unresolved defects. In this study, a new method is proposed for JRC estimation to overcome the deficiencies of existing approaches based on back calculation of shear strength. First, the 10 standard roughness joints are established in numerical rock samples generated by the bonded particle method (BPM). Secondly, the microscopic parameters of the intact rock and joints are calibrated, and a series of direct shear tests of joint samples are carried out under different normal stresses. Finally, the empirical relationships between shear strength and JRC are proposed under high correlation conditions. The results show that the modified smooth joint model (MSJM) is proved to better simulate the mechanical properties of rough joints than the smooth joint model (SJM). When the shear strength of target joint is substituted in the corresponding relationship, the JRC of joint along the shear direction can be conveniently obtained. In addition, the JRC values of 10 standard roughness joint profiles under shear direction of from right to left (FRTL) are obtained. By estimating the JRC of 9 target joints in the literature, it can be seen that the new method proposed in this paper can well reflect the directionality of roughness and it is convenient to apply. |
| format | Article |
| id | doaj-art-7eae97eecdfe4cf984fa43add6143653 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-7eae97eecdfe4cf984fa43add61436532025-02-03T01:23:44ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/78975297897529A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear StrengthJiu-yang Huan0Ming-ming He1Zhi-qiang Zhang2Ning Li3State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, ChinaThe joint roughness coefficient (JRC) is an important factor affecting the shear properties of rock joints, and its accurate estimation is a challenging task in rock engineering. Existing JRC evaluation approaches such as the empirical comparison method and the statistical parameter method have some unresolved defects. In this study, a new method is proposed for JRC estimation to overcome the deficiencies of existing approaches based on back calculation of shear strength. First, the 10 standard roughness joints are established in numerical rock samples generated by the bonded particle method (BPM). Secondly, the microscopic parameters of the intact rock and joints are calibrated, and a series of direct shear tests of joint samples are carried out under different normal stresses. Finally, the empirical relationships between shear strength and JRC are proposed under high correlation conditions. The results show that the modified smooth joint model (MSJM) is proved to better simulate the mechanical properties of rough joints than the smooth joint model (SJM). When the shear strength of target joint is substituted in the corresponding relationship, the JRC of joint along the shear direction can be conveniently obtained. In addition, the JRC values of 10 standard roughness joint profiles under shear direction of from right to left (FRTL) are obtained. By estimating the JRC of 9 target joints in the literature, it can be seen that the new method proposed in this paper can well reflect the directionality of roughness and it is convenient to apply.http://dx.doi.org/10.1155/2019/7897529 |
| spellingShingle | Jiu-yang Huan Ming-ming He Zhi-qiang Zhang Ning Li A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength Advances in Civil Engineering |
| title | A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength |
| title_full | A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength |
| title_fullStr | A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength |
| title_full_unstemmed | A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength |
| title_short | A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength |
| title_sort | new method to estimate the joint roughness coefficient by back calculation of shear strength |
| url | http://dx.doi.org/10.1155/2019/7897529 |
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