Joint profiles and their roughness parameters

Yu, Xianbin; Vayssade, Bernard

doi:10.1016/0148-9062(91)90598-g

Cited by 242 publications

(93 citation statements)

References 10 publications

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“…Compte tenu de la comparaison visuelle, il est possible que deux personnes différentes affectent à un même profil des valeurs différentes pouvant, dans certains cas, conduire à des estimations de la résistance de la fracture très éloignée l'une de l'autre (Tse et Cruden 1979). Cette estimation est donc très imprécise, subjective et contestable (Yu et Vayssade 1990).…”

Section: Modèle Empirique Jrc-jcs De Barton (1973)unclassified

“…Pour essayer de répondre à cette question, de nombreux travaux (Tse et Cruden. 1979, Cunha et al 1990, Maerz et al 1990 On trouve dans la littérature plusieurs autres relations empiriques, en particulier dans Yu et Vayssade (1990), où de nombreuses équations de régression du JRC sur RL (rugosité linéaire), Z2 (racine carrée des carrés de la moyenne de la dérivée première des hauteurs des aspérités), SDi (écart type), SF (fonction de structure). Les définitions et interprétations physiques possibles de ces paramètres sont données au Chapitre II et en particulier dans le Tableau II-2.…”

Section: éQuation 1-19unclassified

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Comportement mecanique d une fracture en cisaillement

Lopez¹

2000

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Section: Modèle Empirique Jrc-jcs De Barton (1973)unclassified

Section: éQuation 1-19unclassified

Comportement mecanique d une fracture en cisaillement

Lopez¹

2000

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“…Among these, amplitude parameters (R z , λ and D h-L ) show a lower sensitivity to the sampling interval (SI) than slope (Z 2 , β 100% , and σ I ) and elongation parameters (δ) in the determination of two-dimensional (2D) JRC (Li et al 2016;Zheng and Qi 2016;Liu et al 2017). Correlations between these parameters and JRC can be found in Tse and Cruden (1979), Yu and Vayssade (1991), Wakabayashi and Fukushige (1992), Tatone and Grasselli (2010), and Zhang et al (2014), and in the reviews by Li and Zhang (2015), Li and Huang (2015), and Zheng and Qi (2016). However, these correlations are all based on 2D roughness profiles, i.e., cross-sections along straight lines over the joint surface.…”

Section: Introductionmentioning

confidence: 99%

Estimating the three-dimensional joint roughness coefficient value of rock fractures

2017

Bull Eng Geol Environ

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Measurement and estimation of the joint roughness coefficient (JRC) is a critical but also difficult challenge in the field of rock mechanics. Parameters for estimating JRC based on a profile derived from a fracture surface are generally twodimensional (2D), where a single or multiple straight profiles derived from a surface cannot reflect the roughness of the entire surface. It is therefore necessary to derive the threedimensional (3D) roughness parameters from the entire surface. In this article, a detailed review is made on 3D roughness parameters along with classification and discussion of their usability and limitations. Methods using Triangulated Irregular Network (TIN) and 3D wireframe to derive 3D roughness parameters are described. Thirty-eight sets of fresh rock blocks with fractures in the middle were prepared and tested in direct shear. Based on these, empirical equations for JRC estimation using 3D roughness parameters have been derived. Nine parameters (θ s , θ g , θ 2s , S sT , S sF , V an , Z sa , Z rms , and Z range ) are found to have close correlations with JRC and are capable of estimating JRC of rock fracture surfaces. Other parameters (Z ss , Z sk , V svi , V sci , S dr and S ts ) show no good correlations with JRC. The sampling interval has little influence when using volume and amplitude parameters (V an , Z sa , Z rms , and Z range ) for JRC estimation, while it influences to some extent when other parameters (θ s , θ g , θ 2s , S sT and S sF ) are used. For their easy calculation, the equations with amplitude parameters are recommended to facilitate rapid estimation of JRC in engineering practice.

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“…A view of of the exposure from where samples were collected is shown in Fig.1. Prior to cutting the samples, weathering grades of the joint surface materials were assigned following the six-fold classification schemes by ANON,1995 [17] and ISRM, 2007 [18]. This was substantiated quantitatively by rebound hammer test (impact energy 0.735Nm).…”

Section: Introductionmentioning

confidence: 99%

Assessment of frictional resistance of granite rock joints with reference to weathering

Kumar¹,

Basu²

2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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Abstract-Shearing resistance of rock joints is considered as one of the key aspects of rock masses as it is related to the stability of rock mass particularly at shallow surface condition. The shear behaviour of rock joints depends upon a number of influencing parameters and weathering state of discontinuity surface is one of them. However, over the years of research, the said issue has not been explored much. Hence this research presents primary findings aimed to explore the shearing resistance of unfilled rock joints regarding granites of different weathering grades. Multistage CNL direct shear tests were performed on six natural granite rock joints of two different but adjacent weathering grades at three different normal stress conditions ranging between 0.21 MPa -0.7 MPa. It should be noted that the weathering grade of discontinuity surface was categorized following the six-fold weathering grade classification scheme, which was also substantiated with Schimdt rebound values. The data obtained from shear test was analysed in terms of stress ratio and peak friction angle, which shows the adverse effect of weathering with increasing normal stress condition. However, at low normal stress condition, such consequences were not significant.

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Joint profiles and their roughness parameters

Cited by 242 publications

References 10 publications

Comportement mecanique d une fracture en cisaillement

Comportement mecanique d une fracture en cisaillement

Estimating the three-dimensional joint roughness coefficient value of rock fractures

Assessment of frictional resistance of granite rock joints with reference to weathering

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