Experimental Studies on the Mechanical Behaviour of Rock Joints with Various Openings

Li, Y.; Oh, Joung; Mitra, R.; Hebblewhite, Bruce

doi:10.1007/s00603-015-0781-3

Cited by 42 publications

(25 citation statements)

References 51 publications

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“…Shear stiffness is calculated using the basic frictional strength and the maximum elastic shear displacement. However, many studies have suggested that joint shear stiffness and the maximum elastic shear displacement rely strongly on rock strength, in situ stress magnitude, joint size, and morphological properties of asperities . Therefore, more variables are to be considered for accurate prediction of shear stiffness and the maximum elastic shear displacement.…”

Section: Discussionmentioning

confidence: 97%

“…However, many studies have suggested that joint shear stiffness and the maximum elastic shear displacement rely strongly on rock strength, in situ stress magnitude, joint size, and morphological properties of asperities. [34][35][36][37][38] Therefore, more variables are to be considered for accurate prediction of shear stiffness and the maximum elastic shear displacement. In this study, the transitional normal stress is estimated based on the work of Grasselli and Egger 24 and Flamand.…”

Section: Advantages and Limitationsmentioning

confidence: 99%

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Analytical modelling of the shear behaviour of rock joints with progressive degradation of two‐order roughness

Liang

Tang

et al. 2019

Num Anal Meth Geomechanics

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Summary We present an analytical model for the shear behaviour of rock joints with progressive degradation of two‐order asperities including waviness and unevenness. Critical waviness and critical unevenness are used to respectively represent the mechanical involvements of waviness and unevenness during shear. The degradation process of two‐order asperities are predicted by considering the stepwise relationship among dilation angle, sheared and unsheared asperity areas, and plastic tangential work. The dilation angle of each asperity decreases as plastic tangential work accumulates. The progressive degradation transiting from critical unevenness to critical waviness is realised through examining the dilation angle and the unsheared area of critical unevenness. The model's predictions are compared with the experimental data from direct shear tests on both regular‐ and irregular‐shaped joints. Good agreement between analytical and experimental curves demonstrate the credence of the proposed model. Therefore, the model, after implemented in finite and discrete element codes, is practicable for the stability assessment of rock‐engineering structures.

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Section: Discussionmentioning

confidence: 97%

Section: Advantages and Limitationsmentioning

confidence: 99%

Analytical modelling of the shear behaviour of rock joints with progressive degradation of two‐order roughness

Liang

Tang

et al. 2019

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

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“…Due to long-time stress relief or natural and engineered disturbances such as earthquakes, nearby excavation, and blasting [1][2][3][4], rock fractures are dislocated or opened. Opened rock fractures exhibit substantially lower shear resistance than the tightly mated ones since asperity interlocking is weakened because of surface dislocation [3,5]. To predict the stability of rock slopes, the shear strength of rock fractures under opened states should be quantified.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, dilation and shear-off occur simultaneously for rock fractures submitted to shear under nonextreme normal stress confinement [1,2,11]. When the rock fractures are opened, the contact area between asperities is reduced [2,5]. Compared with the closed rock fractures, the asperities of opened rock fractures are more easily to be sheared off rather than to dilate due to shear stress concentration [5].…”

Section: Introductionmentioning

confidence: 99%

“…When the rock fractures are opened, the contact area between asperities is reduced [2,5]. Compared with the closed rock fractures, the asperities of opened rock fractures are more easily to be sheared off rather than to dilate due to shear stress concentration [5]. Consequently, the shear resistance of opened rock fractures decreases and the strength reduction depends on the degree of opening [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Prediction of the Shear Failure of Opened Rock Fractures and Implications for Rock Slope Stability Evaluation

2019

Advances in Civil Engineering

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Rock slope commonly fails due to the shear failure of rock fractures. Shear strength of rock fractures are reduced substantially once the fracture surfaces are mismatched or opened. We propose a new criterion to predict the shear strength of rock fractures in different opening states. The degree of interlocking representing the true asperity contact area is incorporated into the modified model of Saeb and Amadei. The effect of fracture opening on asperity dilation and degradation is separately considered. The transitional stress that is a critical parameter involved in the model is analytically determined based on energy consideration. The new model is validated with experimental results from direct shear tests on synthetic fractures with regular-shaped asperities. Good agreement between the analytical solution and the experimental data confirms the capacity of the proposed model. Therefore, the model has great potential for assessing the stability of rock slopes where fractures are often opened due to stress relief and engineering disturbances.

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A Fractal Model for the Shear Behaviour of Large-Scale Opened Rock Joints

Mitra

et al. 2016

Rock Mech Rock Eng

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Experimental Studies on the Mechanical Behaviour of Rock Joints with Various Openings

Cited by 42 publications

References 51 publications

Analytical modelling of the shear behaviour of rock joints with progressive degradation of two‐order roughness

Analytical modelling of the shear behaviour of rock joints with progressive degradation of two‐order roughness

Prediction of the Shear Failure of Opened Rock Fractures and Implications for Rock Slope Stability Evaluation

A Fractal Model for the Shear Behaviour of Large-Scale Opened Rock Joints

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