The shear strength of rock and rock joints

Barton, Nick

doi:10.1016/0148-9062(76)90003-6

Cited by 677 publications

(224 citation statements)

References 24 publications

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“…The empirical shear strength criterion for fractures under high confining pressures proposed by Barton (1976) and Barton & Choubey (1977) can not be applied to the test results obtained here because as the confining stresses increase the τ-σ n relations for the three rock types tend to be non-linear. An alternative empirical criterion is proposed to represent the fracture shear strengths as a function of normal stress, as follows:…”

Section: Empirical Criterionmentioning

confidence: 91%

“…Their results may not truly represent the friction behavior and movement of the fractures at great depth where the fractures are under high normal stresses and confinements. The triaxial shear test method (Barton, 1976;Brady & Brown, 2006;Jaeger et al, 2007; has therefore been developed to simulate the frictional resistance of rock fractures under confinements. The cylindrical rock core containing an inclined fracture or weakness plane can be axially loaded in a triaxial pressure cell with a wide range of applied confining pressures.…”

Section: Introductionmentioning

confidence: 99%

“…The normal stress at which the shear strengths are measured can be controlled by the applied axial stress and confining pressures. Barton (1976) states that under higher confining pressures the behavior of rock ceases to be brittle as the brittle-ductile transition is reached. The Mohr envelopes describing failure of intact rock eventually reach a point of no gradient on crossing a certain line, defined as the critical state line.…”

Section: Introductionmentioning

confidence: 99%

“…The triaxial shear test results obtained by suggest that the back-predicted joint compressive strength (JCS) from triaxial shear tests under high confining pressures is larger than the rock uniaxial compressive strength which might be attributed to the size effect. Barton (1976) and Barton & Chouby (1977) propose a shear strength criterion for the fractures under high confining stresses. They replace the joint compressive strength (JCS) parameter by the difference between the maximum and minimum principal stresses at failure of intact rock (σ 1 -σ 3 ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Displacement Velocity on Rock Fracture Shear Strengths under Large Confinements

Kleepmek¹,

Hamrat²,

Fuenkajorn³

2016

ESR

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Triaxial shear tests are performed to assess the effects of displacement velocity and confining pressure on shear strengths and dilations of tension-induced fractures and smooth saw-cut surfaces prepared in granite, sandstone and marl specimens. A polyaxial load frame is used to apply confining pressures between 1 and 18 MPa with displacement velocities ranging from 1.15×10 -5 to 1.15×10 -2 mm/s. The results indicate that the shearing resistances of smooth saw-cut surfaces tend to be independent of the displacement velocity and confining pressure. Under each confinement the peak and residual shear strengths and dilation rates of rough fractures increase with displacement velocities. The sheared-off areas increase when the confining pressure increases, and the displacement rate decreases. The velocity-dependent shear strengths tend to act more under high confining pressures for the rough fractures in strong rock (granite) than for the smoother fractures in weaker rocks (sandstone and marl). An empirical criterion that explicitly incorporates the effects of shear velocity is proposed to describe the peak and residual shear strengths. The criterion fits well to the test results for the three tested rocks.

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Section: Empirical Criterionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Displacement Velocity on Rock Fracture Shear Strengths under Large Confinements

Kleepmek¹,

Hamrat²,

Fuenkajorn³

2016

ESR

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“…일반적으로 불연속면 에서의 전단강도는 불연속면 표면에 나타난 요철(거칠 기)이 중요한 요인으로 알려져 있다. 요철의 크기에 의 해서 내부마찰각은 달라지며, 요철이 클수록 내부마찰 각도 커지게 된다 (Patton, 1966;Barton, 1976 …”

Section: 공 크기와 마찰계수의 관계unclassified

Pattern of Shear-induced Fracture Development in en Echelon Array : Discrete-element Approach

Kwon¹,

You²,

Kwon³

et al. 2015

Journal of Korean Society For Rock Mechanics

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Rock masses include various rock discontinuities such as faults, joints, and bedding planes. These discontinuities appear as complex structures in geometry. In this study, growth patterns of fractures between two stepping shear fracture tips are numerically modeled using PFC2D (Particle Flow Code). The numerical model showed not only incipient growth of fractures at the tips of preexisting fractures but also subsequent growth of the new fractures. It is observed from all of the experiments that the incipient fractures are tensile cracks developed at 30～57° to the preexisting fractures and the subsequent growth of these fractures were at low angles to the preexisting fractures this study.

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Assessment of some failure criteria for strongly anisotropic geomaterials

Duveau

Shao

Henry

1998

Mech. Cohes.-Frict. Mater.

125

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This paper is devoted to the assessment of some representative failure criteria in the framework of modelling the failure behaviour of strongly anisotropic geomaterials. Experimental data concerning the failure behaviour of a typical strongly anisotropic rock; the schist of Angers are first presented. Nine widely used failure criteria are then selected and classified into three groups, the mathematical continuous models, the empirical continuous models and the discontinuous weakness planes based models. This classification is made up according to the main assumptions and techniques used in each criterion to describe the strength anisotropy. The calibration of each one is carried out with respect to the laboratory data of Angers schist. Qualitative and quantitative comparisons between the selected criteria and with the experimental data are provided. © 1998 John Wiley & Sons, Ltd.

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The shear strength of rock and rock joints

Cited by 677 publications

References 24 publications

Effects of Displacement Velocity on Rock Fracture Shear Strengths under Large Confinements

Effects of Displacement Velocity on Rock Fracture Shear Strengths under Large Confinements

Pattern of Shear-induced Fracture Development in en Echelon Array : Discrete-element Approach

Assessment of some failure criteria for strongly anisotropic geomaterials

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