Compressive failure model for brittle rocks by shear faulting and its evolution of strength components

Zhang, Ping; Li, Ning; Li, Xibing; Nordlund, Erling

doi:10.1016/j.ijrmms.2009.01.002

Cited by 17 publications

(8 citation statements)

References 39 publications

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“…Note that laboratory studies support the aforementioned two-phase proposal. Characteristically, Zhang et al (2009) have recently presented a physical theory for brittle failure that aims to explain both the phenomenological and micro-structural observations. Based on experimental results, the authors conclude that "the localized failure process of rock experiences two stages: the brittle breakage stage (bond rupture) and the sliding stage (frictional resistance of failure plane mobilization).…”

Section: An Explanation Of the Observed Pre-seismic Khz Eme Silencementioning

confidence: 99%

On the puzzling feature of the silence of precursory electromagnetic emissions

Eftaxias

Potirakis

Chélidzé

2013

Nat. Hazards Earth Syst. Sci.

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Abstract. It has been suggested that fracture-induced MHzkHz electromagnetic emissions (EME), which emerge from a few days up to a few hours before the main seismic shock occurrence permit a real-time monitoring of the damage process during the last stages of earthquake preparation, as it happens at the laboratory scale. Despite fairly abundant evidence, electromagnetic (EM) precursors have not been adequately accepted as credible physical phenomena. These negative views are enhanced by the fact that certain "puzzling features" are repetitively observed in candidate fractureinduced pre-seismic EME. More precisely, EM silence in all frequency bands appears before the main seismic shock occurrence, as well as during the aftershock period. Actually, the view that "acceptance of "precursive" EM signals without convincing co-seismic signals should not be expected" seems to be reasonable. In this work we focus on this point. We examine whether the aforementioned features of EM silence are really puzzling ones or, instead, reflect well-documented characteristic features of the fracture process, in terms of universal structural patterns of the fracture process, recent laboratory experiments, numerical and theoretical studies of fracture dynamics, critical phenomena, percolation theory, and micromechanics of granular materials. Our analysis shows that these features should not be considered puzzling.

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Section: An Explanation Of the Observed Pre-seismic Khz Eme Silencementioning

confidence: 99%

On the puzzling feature of the silence of precursory electromagnetic emissions

Eftaxias

Potirakis

Chélidzé

2013

Nat. Hazards Earth Syst. Sci.

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“…Figure 10 shows the number of cracks in the rock during biaxial compression. e stress is defined as σ ci when the number of microcracks is 1% of the microcracks at the peak strength [29]. In the stage of stable crack growth, the number of cracks increases slowly with the increase in axial strain, and the relationship between the number of cracks and the axial strain is approximately linear.…”

Section: Calculation Of σ CI Using Crack Number Versus Axialmentioning

confidence: 99%

Discrete Element Modeling of Crack Initiation Stress of Marble Based on Griffith’s Strength Theory

Wang

Tan

You

et al. 2020

Advances in Civil Engineering

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Investigating the crack initiation stress of rocks is vital for understanding the gradual damage process of rocks and the evolution law of internal cracks. In this paper, the particle flow code method is used to conduct biaxial compression tests on a marble model with an elliptical crack under different confining pressures. According to the evolution status of microcracks in the rock during compression, four characteristic stresses are defined to reflect the gradual damage process of the marble. Two different methods are used to obtain crack initiation stress of rocks, and the calculation results are compared with those based on Griffith’s strength theory to verify the accuracy of this theory under compressive stress. Based on the numerical simulation results, the evolution law for the strength parameters of marble with the degree of damage is described. According to the proportional relationship between the peak stress and crack initiation stress, a new method for predicting the initiation stress is proposed, whose effectiveness is verified. Overall, the results of this study can serve as a useful guide for solving the important problems of slab cracking and rockburst encountered in underground space engineering.

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“…Basic modes of crack extension are sketched in Figure 1. In the rock mechanics and the fracture mechanics literature, a large number of studies have been devoted to the study of initiation, propagation and coalescence of cracks in rocks and brittle materials under different loading conditions (Gehle and Kutter 2003;Kulatilake et al 2001;Le et al 2018;Lee and Jeon 2011;Lee and Ravichandran 2003;Manouchehrian et al 2014;Park and Bobet 2010;Wang et al 2011;Wong and Einstein 2009;Wong and Chau 1998;Wu et al 2019c;Yang et al 2013;Zhang et al 2009;Zhuang et al 2014). These studies revealed many fracturing characteristics of rocks and led to the improvement of safety in rock structures.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Rock Specimens with a Notched Hole Under Compression - A Numerical Study

Manouchehrian

Kulatilake

2021

Preprint

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Discontinuities are natural structures that exist in rocks and can affect the stability of rock structures. In this article, the influence of notch presence on the failure evolution around a hole in compressed rock specimens is investigated numerically. Firstly, the uniaxial compressive test on a rock specimen with a circular hole is modeled and the failure evolution in the specimen is simulated. In a separate model, notches are created at the surface of the hole. Results show that when the notches are created in the model, failure zone around the hole is transferred to a distance away from the surface of the hole. In addition, a parametric study is carried out to investigate the influence of the notch length and the confining pressure on the fracturing behavior of the specimen. Numerical results presented in this article indicate that the presence of notches at the surface of the hole and their dimensions can affect the fracturing mechanism of the specimen. In some cases, the failure at the boundary of the hole is prevented when the notches of certain dimensions are added to the hole. The insights gained from this numerical study may be helpful to control the failure around underground excavations.

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Compressive failure model for brittle rocks by shear faulting and its evolution of strength components

Cited by 17 publications

References 39 publications

On the puzzling feature of the silence of precursory electromagnetic emissions

On the puzzling feature of the silence of precursory electromagnetic emissions

Discrete Element Modeling of Crack Initiation Stress of Marble Based on Griffith’s Strength Theory

Failure Mechanism of Rock Specimens with a Notched Hole Under Compression - A Numerical Study

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