A shear-displacement criterion for soil-infilled rock discontinuities

Indraratna, Buddhima; Oliveira, David; Brown, E. T.

doi:10.1680/geot.8.p.094

Cited by 44 publications

(30 citation statements)

References 11 publications

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“…The changes in the macroscopic mechanical characteristics result from changes in the microstructure (Indraratna et al, 2010;Liu and Xu, 2014;Wu et al, 2013). Rocks in practical engineering are generally subjected to joint action of two or more factors.…”

Section: Discussionmentioning

confidence: 99%

Analysis on damage mechanical characteristics of marble exposed to high temperature

Shi

2015

International Journal of Damage Mechanics

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Study on the mechanical response of rock under the combined effects of high temperature and mechanical load using the method of damage mechanics is a relatively new research direction of rock mechanics. The thermal damage and mechanical damage are indicated by the uniaxial compression mechanical test of marble after exposure to high temperature. The overall damage evolution equation of rock is deduced and high-temperature damage constitutive equation is established on the basis of the macroscopic phenomenological damage mechanics and nonequilibrium statistical methods. The evolution law of the damage characteristics of rock after exposure to high temperature, taking the temperature and mechanical load as the control variable, is discussed. The results show that the effect of temperature on the mechanical properties of marble can be accurately described through the definition of thermal damage using elastic modulus. The high-temperature damage constitutive model curves are similar to the experimental curves, reflecting well the brittleness of marble. Additionally, the constitutive relations of rock after exposure to high temperature have close relationships with the elastic modulus, compressive strength, and peak strain. The overall damage of rock changes along two evolutionary pathways of high temperature and strain, reflecting the mutual combined influences of high temperature and strain on the material damage extension, can accurately reveal the damage mechanical behavior and the damage propagation law of rock material after exposure to high temperature.

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Section: Discussionmentioning

confidence: 99%

Analysis on damage mechanical characteristics of marble exposed to high temperature

Shi

2015

International Journal of Damage Mechanics

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“…ese soft fillings significantly weaken the shear strength of jointed rock and make the rock present more obvious heterogeneity and anisotropy. Infilled joints generally become the weakest position under shear which will easily trigger the whole instability of engineering rock [1][2][3][4]. erefore, the study of shear properties of infilled joints is of significance in both stability evaluation and reinforcement of engineering rock.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the in lled ratio, that is, the ratio of lling thickness, t, and the asperity height, a, is a signi cant factor controlling the shear properties of in lled joints. A large number of direct shear test results [1,3,[12][13][14][15][16] showed that the in lled ratio, t/a, has a critical value. If the in lled ratio is less than the critical value, the shear failure strength of in lled joints is typically higher than the shear strength of llings but lower than that of asperity.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis Method of Shear Properties of Infilled Joints under Constant Normal Stiffness Condition

Wang

Zhang

2018

Advances in Civil Engineering

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e direct shear test is implemented in this paper for infilled joints under constant normal stiffness (CNS) condition with the finite difference software FLAC3D. e CNS condition was performed based on a servoprogram developed by FISH language. e effects of initial normal stress, undulating angle, and infilled ratio on the shear failure mode of infilled joints under CNS are revealed based on numerical simulation. It is found that the shear strength of infilled joints will grow along with the increase of the undulating angle and the decrease of the infilled ratio. e numerical analysis method is also able to quantify the effect of multiple factors (initial normal stress and infilled ratio) on shear properties of infilled joints. e model shows a good agreement with the experimental results available in the literatures. erefore, this study proposed and verified a numerical analysis method capable of studying the effects of normal stress, undulating angles, and infilled ratio on the shear behavior of infilled rock joints.

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“…These discontinuities largely weaken the overall stability of rock masses (Barton 1974), which is one of the largest concerns in mining and civil engineering. Factors dominating the joint shear behaviour have been investigated for decades (Phien-wej et al 1990;de Toledo and de Freitas 1993;Indraratna et al 2001Indraratna et al , 2010, however the influence of infill saturation/water condition has not been recognised until recently (Alonso et al 2013;Indraratna et al 2014;Khosravi et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Shear Behavior of Rock Joints Filled with Unsaturated Soil

2018

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Weak infilled discontinuities commonly exist in rock masses, in which the infill degree of saturation largely influences the overalljoint shear behavior and ground stability. However, so far, research on the shear of infilled joints at unsaturated conditions is rare, especiallythose performed in numerical simulation. To the authors'knowledge, no attempts have been made to investigate the shear-induced variationsin unsaturated soil parameters, which are vital for proposing the infilled-joint constitutive models. For thefirst time, a series of constant watercontent direct shear tests on the unsaturated infilledjoint soil were conducted using the numerical software Fast Lagrangian Analysis ofContinua (FLAC)/Two-Phase Flow. Intrinsic soil-water retention and permeability models were updated in the FISH subroutine to considerporosity. Results highlight the disadvantage of the built-in models in FLAC. Initial infill saturation and other factors, including physical shearrate, joint roughness, infill thickness, and normal stress, all showed effects on the joint shear strength consistent with literature reports. Shear-induced variations in the mean values of Bishop effective stress and permeability of the infill layer were emphasized Abstract: Weak infilled discontinuities commonly exist in rock masses, where the infill degree of saturation largely influences the overall joint shear behaviour and ground stability. However so far, researches on the shear of infilled joints at unsaturated conditions are rare, especially those carried out in numerical simulation. Also to the authors' knowledge, no attempts have been made to investigate the shear-induced variations in unsaturated soil parameters that are vital for proposing the infilled-joint constitutive models. For the first time, a series of constant water content direct shear tests on the unsaturated infilled-joint soil were conducted using the numerical software FLAC/Two-Phase Flow. Intrinsic soil-water retention and permeability models were updated in FISH subroutine to consider porosity. Results highlight the disadvantage of the built-in models in FLAC. Initial infill saturation and other factors including physical shear rate, joint roughness, infill thickness and normal stress all showed effects on the joint shear strength consistent with literature reports. Shear-induced variations in the mean values of Bishop effective stress and permeability of the infill layer were emphasised.

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A shear-displacement criterion for soil-infilled rock discontinuities

Cited by 44 publications

References 11 publications

Analysis on damage mechanical characteristics of marble exposed to high temperature

Analysis on damage mechanical characteristics of marble exposed to high temperature

Numerical Analysis Method of Shear Properties of Infilled Joints under Constant Normal Stiffness Condition

Numerical Simulation of the Shear Behavior of Rock Joints Filled with Unsaturated Soil

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