## Estimation of the joint roughness coefficient (JRC) of ...

Keywords Rock joint Joint roughness coefﬁcient (JRC) Roughness amplitude Vector similarity measure Introduction It has long been recognized that rock joints play an important role regarding mechanical properties and defor-mation behavior of rock masses (Du et al. 2000; Andrade

More## (PDF) Determination of joint roughness coefficient

Surface roughness of rock discontinuities is an important factor that determines the strength characteristics of rock mass. Joint roughness coefficient (JRC), which is

More## (PDF) Estimating joint roughness coefficients

24-10-2020 The JRC is a well-known criterion for explicitly measuring roughness of rock fractures (Barton and Choubey 1977) and can be calculated by an empirical equation correlated with fracture

More## Estimation of the joint roughness coefficient of

30-03-2017 is widely used and was proposed by Barton (1973) to estimate the peak shear strength of rock joints, (1) τ = σ n tan JRC log JCS σ n + φ b where τ is the peak shear strength of the rock joint, σ n is the effective normal stress, JRC is the joint roughness coefficient, JCS is the joint wall compressive strength, which is equal to the uniaxial compressive strength (UCS) of the rock for the fresh rock joints,

More## Quantitative estimation of joint roughness coefficient ...

Rock joint Joint roughness coefﬁcient (JRC) Quantitative estimation Statistical parameter 1. Introduction The rock joint roughness coefﬁcient (JRC) has been used for the estimation of the peak shear strength of rock joints since 1973 when Barton [1] put forward the following empirical equation, which is also called JRC–JCS model:

More## Expressions of Rock Joint Roughness Coefficient Using ...

because determining the joint roughness coefficient (JRC) effectively is a key parameter in the shear strength between rock joint surfaces. In this original study, we first propose neutrosophic interval probability (NIP) and define the confidence degree based on

More## Correlation between the Joint Roughness

Joint roughness coefficient (JRC) is a major factor that affects the mechanical properties of rock joints. Statistical methods that are used to calculate the JRC increasingly depend on a sampling interval (#x394;x).

More## Correlation of Joint Roughness Coefficient (JRC) and Peak ...

rock material itself appears “faded”, especially for the finer grain metamorphic rocks. The Joint Roughness Coefficients, JRC were also determined for all the natural discontinuity planes that were subjected to tilt testing. The results of testing are summarized in Table 1.

More## (PDF) Determination of joint roughness coefficient

C 42 Joint roughness coefficient Field measurements using Barton’s combs 88 N A standard method of JRC determination is related to field 89 43 Introduction measurements, which are performed using a profile gauge (for 90 U 44 Joint roughness coefficient (JRC) has been widely used in rock

More## Figure 1 from Correlation of joint roughness

Figure 1. Standard 15cm JRC comb profiler employed in this study - "Correlation of joint roughness coefficient (JRC) and peak friction angles of discontinuities of Malaysian Schists"

More## Estimation of the joint roughness coefficient (JRC) of ...

Keywords Rock joint Joint roughness coefﬁcient (JRC) Roughness amplitude Vector similarity measure Introduction It has long been recognized that rock joints play an important role regarding mechanical properties and defor-mation behavior of rock masses (Du et

More## (PDF) Determination of joint roughness

C 42 Joint roughness coefficient Field measurements using Barton’s combs 88 N A standard method of JRC determination is related to field 89 43 Introduction measurements, which are performed using a profile gauge (for 90 U 44 Joint roughness coefficient (JRC) has been widely used in rock example, Barton’s comb).

More## Correlation of Joint Roughness Coefficient (JRC) and Peak ...

rock material itself appears “faded”, especially for the finer grain metamorphic rocks. The Joint Roughness Coefficients, JRC were also determined for all the natural discontinuity planes that were subjected to tilt testing. The results of testing are summarized in Table 1.

More## Expressions of Rock Joint Roughness Coefficient Using ...

because determining the joint roughness coefficient (JRC) effectively is a key parameter in the shear strength between rock joint surfaces. In this original study, we first propose neutrosophic interval probability (NIP) and define the confidence degree based on the cosine measure between NIP and the ideal NIP.

More## Determining of the Joint Roughness Coefficient

This work intends to embed the estimation of the joint roughness coefficient (JRC) in the framework of random fields. The random field method is a probabilistic approach which involves modeling of the spatial variability of the pertinent physical quantities as a fundamental part of the (assumed) underlying probabilistic structure. Although this method is one of higher complexity

More## of Rs- Joint Roughness Using $4 Approach

The most commonly used measure of joint roughness in rock engineering practice is the joint roughness coefficient (JRC) proposed by N.R. Barton [ 11 and adopted by the International Society for Rock Mechanics (ISRM) [2]. This JRC concept has been implemented in a rock joint model developed by Barton and Choubey [3]. This rock joint model is ...

More## A re-examination of joint roughness coefficient (JRC)

For a particular joint profile, Anor is defined as the ratio of the respective profile amplitude to the maximum profile amplitude among the 10 JRC profiles. Profile 8 (JRC 14-16) has the maximum profile amplitude of 6.62 mm JRC k1 log(Z2) k2 Anor k3 k 4 where k1, k2, k3 and k4 are coefficients to be solved 31 32 JRC 41.17log(Z 2) 4.93A nor

More## Joint Roughness Coefficient (JRC) Scientific.Net

Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

More## Figure 1 from Correlation of joint roughness

Figure 1. Standard 15cm JRC comb profiler employed in this study - "Correlation of joint roughness coefficient (JRC) and peak friction angles of discontinuities of Malaysian Schists"

More## 1. Introduction - downloads.hindawi

The roughness of a rock joint directly affects the strength, deformation, and seepage characteristics of a rock mass. Barton and Choubey [1] established ten typical profiles through a back-calculation test to quantify the joint roughness coefficient (JRC).The JRC can be visually estimated from the standard profiles that correspond to values within [0, 20] in laboratory tests.

More## Estimating joint roughness coefficients -

01-10-1979 Relationship between the JRC and Z2 parameters for Barton and Choubey's 10 standard rock surface profiles. the joint roughness coefficient of a rock surface can be particularly well predicted by the parameters, Z2 and SF. The data are plotted in Figs 2 and 3.

More## Relationship between joint roughness

01-04-2015 Numerous empirical equations have been proposed to estimate the joint roughness coefficient (JRC) of a rock fracture based on its fractal dimension (D).A detailed review is made on these various methods, along with

More## Estimation of the joint roughness coefficient

20-02-2021 DOI: 10.1007/s10064-016-0947-6 Corpus ID: 3698367. Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures @article{Yong2017EstimationOT, title={Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures}, author={Rui Yong and J. Ye and Qi-feng Liang and

More## Joint roughness coefficient test device, Rock

It is used to calculate the JRC of a rock or joint. The device consists of an adjustable inclined plane, on which the rock sample (100 mm max dia.) is placed, separated along the surface where the roughness is to be measured. Then the plane is slowly tilted until sliding of the upper part of the sample on the lower one occurs.

More## Estimating the Joint Roughness Coefficient of

When translating digital roughness profiles of a closed rock joint along the shear direction, the overlapping translational areas can reasonably represent the main potential contact areas in shear tests. By translating Barton’s ten typical roughness profiles, a series of statistical parameters, including the overlapping areas (S*), overlapping number (N*), cumulative

More## (PDF) Determination of joint roughness

C 42 Joint roughness coefficient Field measurements using Barton’s combs 88 N A standard method of JRC determination is related to field 89 43 Introduction measurements, which are performed using a profile gauge (for 90 U 44 Joint roughness coefficient (JRC) has been widely used in rock example, Barton’s comb).

More## (PDF) Determination of j oint roughness

C 42 Joint roughness coefficient Field measurements using Barton’s combs 88 89 N A standard method of JRC determination is related to field 43 Introduction measurements, which are performed using a profile gauge (for 90 U 44 Joint roughness coefficient (JRC) has been widely used in rock example, Barton’s comb).

More## Estimation of the joint roughness coefficient

05-01-2021 Fig. 2 Schematic diagram of principle of the joint roughness profile digitization method on the basis of image pixel analysis. a Grayscale image of the joint profile; b magnified zoom in 1 cm length; c gray matrix; d the digitized points - "Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures"

More## A new method estimating the 2D Joint

01-12-2014 Joint Roughness Coefficient (JRC) is one of the principal parameters used to calculate the shear strength and conducting aperture of discontinuities.Originally, 10 standard discontinuity profiles were commonly associated with JRC values. However, as the original profiles provided a rough estimation of joint roughness, many researchers attempted to

More## Expressions of Rock Joint Roughness Coefficient Using ...

S S symmetry Article Expressions of Rock Joint Roughness Coefﬁcient Using Neutrosophic Interval Statistical Numbers Jiqian Chen 1, Jun Ye 1,2,*, Shigui Du 1 and Rui Yong 1 1 Key Laboratory of Rock Mechanics and Geohazards, Shaoxing University, 508 Huancheng West Road, Shaoxing 312000, China; [email protected] (J.C.); [email protected] (S.D.);

More## Jrc-1 Rock Joint Roughness Coefficient

JRC-1 Rock Joint Roughness Coefficient Apparatus (Tilt Test) Characristics: It is used to calculate the JRC of a rock or of a joint.The equipmen consists of an adjustable inclined plane,on which the rock sample (100mm dia.max)is placed,separeted along the surface where roughness is to be easure.Then the plane is slowly tilted until sliding of the upper part of the asmple on the lower one ...

More## Expressions of Rock Joint Roughness Coefficient

However, we cannot express them by the crisp values in classical probability and statistics. In geotechnical engineering, we need to try our best to approximate exact values in indeterminate environments because determining the joint roughness coefficient (JRC) effectively is a key parameter in the shear strength between rock joint surfaces.

More## Estimation of the joint roughness coefficient

20-02-2021 DOI: 10.1007/s10064-016-0947-6 Corpus ID: 3698367. Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures @article{Yong2017EstimationOT, title={Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures}, author={Rui Yong and J. Ye and Qi-feng Liang and M. Huang and S. Du}, journal={Bulletin of

More## Quantitative study on joint roughness coefficient

19-03-2019 Ten Barton's standard roughness rating profile curves have been digitized by the interpolation approach with MATLAB software. It is proved that the way of digitizing the JRC curve

More## Estimation of the joint roughness coefficient

DOI: 10.1007/s10064-016-0947-6 Corpus ID: 3698367. Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures @article{Yong2017EstimationOT, title={Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures}, author={Rui Yong and J. Ye and Qi-feng Liang and M. Huang and Shi-gui Du}, journal={Bulletin of Engineering ...

More## A new method for determination of joint

JRC calculated using equations suggested by Tse Cruden and by this research for standard roughness profile. Application of new equations to natural rock joints We digitized roughness profiles of 25 natural rock joints and JRC were calculated using equations 8 and 11.

More## Estimation of the joint roughness coefficient

05-01-2021 Fig. 2 Schematic diagram of principle of the joint roughness profile digitization method on the basis of image pixel analysis. a Grayscale image of the joint profile; b magnified zoom in 1 cm length; c gray matrix; d the digitized points - "Estimation of the joint roughness coefficient (JRC) of rock joints by vector similarity measures"

More## Joint roughness coefficient test device, Rock

It is used to calculate the JRC of a rock or joint. The device consists of an adjustable inclined plane, on which the rock sample (100 mm max dia.) is placed, separated along the surface where the roughness is to be measured. Then the plane is slowly tilted until sliding of

More## [PDF] Estimating the joint roughness coefficient

17-02-2021 The paper presents the results of different methods of determining the roughness of joints in quartzites, metagreywackes and phyllites obtained from road cuts in central Portugal. The evaluation of the joint roughness coefficient (JRC) was carried out using graphical and analytical procedures. Differences were found between the JRC graphic and the JRC calculated, depending on the method

More## Expressions of Rock Joint Roughness Coefficient Using ...

S S symmetry Article Expressions of Rock Joint Roughness Coefﬁcient Using Neutrosophic Interval Statistical Numbers Jiqian Chen 1, Jun Ye 1,2,*, Shigui Du 1 and Rui Yong 1 1 Key Laboratory of Rock Mechanics and Geohazards, Shaoxing University, 508 Huancheng West Road, Shaoxing 312000, China; [email protected] (J.C.); [email protected] (S.D.); [email protected] (R.Y.)

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