The anisotropy of surface morphology characteristics of rock discontinuities

Aydan, Ömer; Shimizu, Yasuhiro; Kawamoto, T.

doi:10.1007/bf01019939

Cited by 52 publications

(11 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fracture roughness and, consequently, shear resistance are often anisotropic (Huang and Doong 1990;Jing et al 1992;Aydan et al 1996). This directional anisotropy in roughness is typically displayed using polar plots of roughness parameters obtained in different orientations.…”

Section: Oriented Roughness Measurementmentioning

confidence: 99%

Quantitative Measurements of Fracture Aperture and Directional Roughness from Rock Cores

Tatone

Grasselli

2012

Rock Mech Rock Eng

View full text Add to dashboard Cite

Section: Oriented Roughness Measurementmentioning

confidence: 99%

Quantitative Measurements of Fracture Aperture and Directional Roughness from Rock Cores

Tatone

Grasselli

2012

Rock Mech Rock Eng

View full text Add to dashboard Cite

“…However, existing research methods can only deal For example, assume that a NN is z = 8 + 5I, where I [0, 0.5]. Thus, its determinate part is 8, its indeterminate part is 5I, and then there is z [8, 10.5] for I [0, 0.5]. Furthermore, one can also specify some indeterminate range I [I L , I U ] to satisfy the actual applied requirements.…”

Section: Introductionmentioning

confidence: 99%

“…Various methods for determining the JRC values have been proposed by many scholars [2][3][4][5][6][7][8][9][10] since Barton [11] firstly introduced the concept of JRC. Since then there have also been many studies about the anisotropy and scale effect, which are two important characteristics of JRC in the sample sizes and measuring orientations.…”

Section: Introductionmentioning

confidence: 99%

Expression and Analysis of Joint Roughness Coefficient Using Neutrosophic Number Functions

Chen

Rui

et al. 2017

Information

View full text Add to dashboard Cite

Abstract:In nature, the mechanical properties of geological bodies are very complex, and its various mechanical parameters are vague, incomplete, imprecise, and indeterminate. In these cases, we cannot always compute or provide exact/crisp values for the joint roughness coefficient (JRC), which is a quite crucial parameter for determining the shear strength in rock mechanics, but we need to approximate them. Hence, we need to investigate the anisotropy and scale effect of indeterminate JRC values by neutrosophic number (NN) functions, because the NN is composed of its determinate part and the indeterminate part and is very suitable for the expression of JRC data with determinate and/or indeterminate information. In this study, the lower limit of JRC data is chosen as the determinate information, and the difference between the lower and upper limits is chosen as the indeterminate information. In this case, the NN functions of the anisotropic ellipse and logarithmic equation of JRC are developed to reflect the anisotropy and scale effect of JRC values. Additionally, the NN parameter ψ is defined to quantify the anisotropy of JRC values. Then, a two-variable NN function is introduced based on the factors of both the sample size and measurement orientation. Further, the changing rates in various sample sizes and/or measurement orientations are investigated by their derivative and partial derivative NN functions. However, an actual case study shows that the proposed NN functions are effective and reasonable in the expression and analysis of the indeterminate values of JRC. Obviously, NN functions provide a new, effective way for passing from the classical crisp expression and analyses to the neutrosophic ones.

show abstract

“…This controversial phenomenon was also found by the other researchers (Yang and Lo 1997;Lee et al 2001;Grasselli and Egger 2003;Li et al 2008;Xia et al 2014). In addition, roughness of a natural rock joint is anisotropic (Aydan et al 1996;Jing et al 1992;Kulatilake et al 1995a, b;Mah et al 2013). Even along one particular direction, the peak shear strength of a joint can be different in the forward and backward directions.…”

Section: Introductionmentioning

confidence: 95%

Experimental Study on Peak Shear Strength Criterion for Rock Joints

et al. 2015

View full text Add to dashboard Cite

The three-dimensional (3D) morphology of a rock joint has a great impact on its shear behavior. To study the relationship between the 3D morphological characteristics and the peak shear strength, several tilt tests were conducted on four groups of tensile fractures and direct shear tests were carried out under different constant normal loads (CNL). The normal load ranges from 0.325 to 8.0 MPa. In this study, fresh tensile fractures which were splitted from granite and sandstone samples were used. The morphology of each tensile fracture was measured before direct shear tests. A new peak shear strength criterion for rock joints is proposed using two 3D morphological parameters which are termed as the maximum apparent dip angle h Ã max and the roughness parameter C. The calculated peak strengths using the proposed criterion match well with the observed values. In addition, a comparison of the proposed model with the Grasselli's model (2003) and Xia's model (2014) shows that the proposed model is easier in the form and gives a rational improvement. At last, direct shear test data of tensile fractures which are collected from Grasselli (2003) are used to verify the proposed model. It is seen that the proposed model has a reliable estimate of the peak shear strength of tensile fractures and presumably for rock joints.

show abstract

The anisotropy of surface morphology characteristics of rock discontinuities

Cited by 52 publications

References 6 publications

Quantitative Measurements of Fracture Aperture and Directional Roughness from Rock Cores

Quantitative Measurements of Fracture Aperture and Directional Roughness from Rock Cores

Expression and Analysis of Joint Roughness Coefficient Using Neutrosophic Number Functions

Experimental Study on Peak Shear Strength Criterion for Rock Joints

Contact Info

Product

Resources

About