The Influence of Shearing Velocity on Shear Behavior of Artificial Joints

Atapour, Hashem; Moosavi, M.

doi:10.1007/s00603-013-0481-9

Cited by 101 publications

(26 citation statements)

References 28 publications

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“…In recent studies, artificial rock joints are generally used to study the rate-dependent strength behaviour of rock joints. Plaster of Paris is used to model the rock joints of soft rocks (Atapour and Moosavi 2013;Atapour and Moosavi 2014;Mirzaghorbanali et al 2014;Tang and Wong 2016;Wang et al 2016) and concrete/mortar is used to model rock joints of hard rocks (Jafari et al 2004;Atapour and Moosavi 2013;Atapour and Moosavi 2014). From these studies on artificial rock joints, it has been concluded that, with increasing shear velocity, the shear resistance of the rock joints increases for harder rocks while it reduces for softer rocks.…”

Section: Introductionmentioning

confidence: 99%

Shear velocity-based uncertainty quantification for rock joint shear strength

Tiwari

Latha

2019

Bull Eng Geol Environ

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The shear strength of rock joints is an important property required in order to analyze the stability of rock slopes and tunnels. However, estimation of the shear strength of rock joints for in situ conditions is a complex task due to various influencing factors present in the field. Among these factors, the shear velocity or the shear displacement rate along the rock joints are important parameters which are relatively less studied since their effect is considered to be of second order compared to other factors. However, some recent studies in the literature suggest that shear velocity has a significant influence on the shear strength of rock joints, and hence the shear strength of joints estimated at low shear velocities in laboratories cannot be used under in situ conditions where the possibility of higher shear velocities exist due to the presence of different factors, such as blasting, excavation, and thermal and seismic loads. In this paper, we have addressed these issues in three steps. In the first step, an experimental study on jointed rock specimens is presented to investigate the influence of the displacement rate on the shear strength of rock joints. In the second step, a probabilistic method is developed based on the experimental results and the compiled data from the literature to estimate the in situ shear strength of joints under higher displacement rate conditions, i.e., blasting, excavation, and seismic loads from laboratory-estimated shear strength at the International Society for Rock Mechanics suggested low displacement rates. In the third step, a case study of a Himalayan rock tunnel was used to demonstrate the described approach. It was observed that the shear strength of discontinuities reduced with ncreasing shear velocity and that the rate dependency was higher for low-density rocks and under high confining stress. Further, a considerable effect was observed on the probability of failure of the rock tunnel when the effect of shear velocity was considered in the stability analysis.

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Section: Introductionmentioning

confidence: 99%

Shear velocity-based uncertainty quantification for rock joint shear strength

Tiwari

Latha

2019

Bull Eng Geol Environ

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“…An appropriate evaluation of shear behavior of rock joints is vital, for instance, when analyzing the stability of rock slopes, designing excavations in jointed rock, and designing rocksocked piles [1]. A considerable amount of work has been conducted to describe the shear behavior of rock joints [2][3][4][5][6][7][8]. However, in a variety of geomechanical engineering applications, such as rock quarrying, rock drilling, rock excavation, and rock blasting, rock joints may be stressed and failed dynamically [9].…”

Section: Introductionmentioning

confidence: 99%

“…With regard to shear behavior evaluation through laboratory investigation, the direct shear test and cyclic shear test have gained significant attention. Considering the spatial geometry and stress state of rock joints, direct shear tests [6,[16][17][18][19][20] and cyclic shear tests [7,8,[21][22][23][24][25] were conducted by different researchers from around the world. It should, however, be noted that the aforementioned shear test requires a costly shear test apparatus, and moreover, it involves a difficult, complex, and time-consuming procedure of sample collection and preparation.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Shear Strength of Rock Joints and Its Influence on Key Blocks

Wang

Xiu

2019

Geofluids

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Shear strength deterioration of rock joints and its induced instability of key blocks subjected to dynamic disturbance constitute the mechanism of many geological disasters such as rockburst, landslide, and rockfall. In this study, the influence of dynamic disturbance on rock joints was quantified in the form of stress, of which model was established by quasistatic method. The dynamic shear strength of rock joints was analyzed theoretically following the Coulomb-Navier criterion and further investigated experimentally by split Hopkinson pressure bar (SHPB) tests with impact velocities of 4.850 m/s, 8.722 m/s, 12.784 m/s, and 16.935 m/s. The effect of engineering disturbance on shear strength of rock joints was measured, and a degradation coefficient was used to describe it quantitatively. Considering the degradation of dynamic shear strength of rock joints and its influence on block stability, the method for determining key blocks under dynamic disturbance was given. Implementing this method into the program of Geotechnical Structure and Model Analysis-3D (GeoSMA-3D) developed by the authors’ team, the visualization of key blocks was achieved. From theoretical analysis and experimental investigation, it was figured out that the shear strength of rock joints is degraded under dynamic disturbance. The degradation of friction angle becomes more sensitive than that of cohesion. Additionally, numerical results show that the number of key blocks was increased with the increasing impact velocities.

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“…In the past decades, numerous studies have been performed to investigate the shear behavior of rock joints under different conditions: constant normal load (CNL) and constant normal stiffness (CNS) [16][17][18][19][20]. However, the seepage behavior coupling with stress was not comprehensively involved in these studies.…”

Section: Introductionmentioning

confidence: 99%

Shear-Flow Coupled Behavior of Artificial Joints with Sawtooth Asperities

Zhao

Zhang

et al. 2018

Processes

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The coupling between hydraulic and mechanical processes in rock joints has significantly influenced the properties and applications of rock mass in many engineering fields. In this study, a series of regular shear tests and shear-flow coupled tests were conducted on artificial joints with sawtooth asperities. Shear deformation, strength, and seepage properties were comprehensively analyzed to reveal the influence of joint roughness, normal stress, and seepage pressure on shear-flow coupled behavior. The results indicate that the shear failure mode, which can be divided into sliding and cutting, is dominated by joint roughness and affected by the other two factors under certain conditions. The seepage process makes a negative impact on shear strength as a result of the mutual reinforcing of offsetting and softening effects. The evolution of hydraulic aperture during the shear-flow coupled tests embodies a consistent pattern of four stages: shear contraction, shear dilation, re-contraction, and stability. The permeability of joint sample is considerably enlarged with the increase of joint roughness, but decreases with the addition of normal stress.

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The Influence of Shearing Velocity on Shear Behavior of Artificial Joints

Cited by 101 publications

References 28 publications

Shear velocity-based uncertainty quantification for rock joint shear strength

Shear velocity-based uncertainty quantification for rock joint shear strength

Dynamic Shear Strength of Rock Joints and Its Influence on Key Blocks

Shear-Flow Coupled Behavior of Artificial Joints with Sawtooth Asperities

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