Investigation of the failure mode of shale rocks in biaxial and triaxial compression tests

Arora, Shrey; Mishra, Brijes

doi:10.1016/j.ijrmms.2015.08.014

Cited by 47 publications

(21 citation statements)

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“…Over the past few decades, many researchers have devoted considerable effort to the study of failure and deformation of rock under different loading conditions from both the microscopic and mesoscopic points of view (Arora and Mishra, 2015;Cai and Liu, 2009;Kittitep and Decho, 2012;Loaiza et al, 2012;Tang and Hudson, 2010;Wong and Baud, 2012;Xie et al, 2012;Yang et al, 2008;Yang, Jing, and Wang., 2012;Zhong, Liu, and Ma., 2015). When the confining pressure is zero or very low, macroscopic failure is typically associated with axial splitting.…”

Section: An Investigation Of Failure Modes and Failure Criteria Of Romentioning

confidence: 99%

An investigation of failure modes and failure criteria of rock in complex stress states

Shi

Tang

2017

J. South. Afr. Inst. Min. Metall.

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Determination of rock mass strength is important in most rock engineering analyses that are based on solid mechanics. Better understanding of rock mass strength will facilitate proper engineering design of structures. The loading condition of rock is complex, and a rock failure criterion represents the strength of rock under different loading conditions. Many failure criteria have been proposed by researchers during the past decades. In rock engineering practice, the linear Mohr-Coulomb (MC) criterion and the nonlinear Hoek-Brown (HB) criterion are widely used in conditions where 2 = 3 , largely due to their simplicity in formulation and the large amount of experimental data available (Melkoumian, Priest, and Hunt, 2009), despite the fact that the physical sense of the former is obscure and the latter is of a purely empirical character. Both the abovementioned criteria suffer limitations arising from ignoring the effect of the intermediate principal stress ( 2 ) on rock strength (Chang and Haimson, 2012;Haimson, 2006;Tiwari and Rao, 2004). Much of the experimental evidence accumulated so far strongly suggests that 2 has a considerable effect on rock strength (Chang and Haimson, 2012;Tanapol, Chaowarin, and Kittitep, 2013;Tarasov and Potvin, 2013). To incorporate the influence of 2 , several general failure criteria have been proposed, among which the Drucker-Prager criterion, the modified Lade criterion, the 3D Hoek-Brown criterion, and the unified strength criterion are well-known (Xie and Chen, 2004). However, these failure criteria are not commonly employed in practice. According to several comparative studies, none of the existing 3D failure criteria has a significant advantage over others, from both mathematical and practical points of view.A perceived shortcoming of the traditional failure criteria is that they are established only on the basis of macroscopic experiments and combined theoretical analysis, and they do not attempt to microscopically analyse the failure mechanism and failure criterion of rock under different loading conditions. In fact, the study of deformation and failure of rock on the micro-meso scale can reveal the innate character and relationship between the macroscopic response, in the form of deformation or failure, and the intrinsic microscopic mechanism (Adelinet et al., 2013;Lin et al., 2015; Zhou and Linn, 2013; Zhou and Linn, 2014).An investigation of failure modes and failure criteria of rock in complex stress states by Z. Li*, J. Shi*, and A. Tang* Rock in engineering and geological environments is usually in complex stress states. Based on many experimental results for rock under different loading conditions, and combined with failure modes found in previous studies, stress triaxiality is introduced to describe different stress states, and the relationship between failure modes and stress triaxiality is analysed in detail. For a given kind of rock, with decreasing stress triaxiality the failure mechanism changes from tension fracture to local shear failure and general shear f...

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Section: An Investigation Of Failure Modes and Failure Criteria Of Romentioning

confidence: 99%

An investigation of failure modes and failure criteria of rock in complex stress states

Shi

Tang

2017

J. South. Afr. Inst. Min. Metall.

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“…Zhou et al and Tan et al researched the mechanical behavior of model specimens that meet the architectural features of layer‐crack structures. Arora and Mishra Du et al and Gong et al reproduced the failure process of layer‐crack structures through biaxial or triaxial laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the failure mechanism of layer‐crack structure

Guo

Tan

et al. 2019

Energy Science & Engineering

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Field investigations have proven that layer‐crack structures make an essential contribution to rock burst occurrence in brittle coal or rock mass. This paper first studies the mechanical behavior of layer‐crack red sandstone specimens with different geometric configurations of vertical fissures (ie, fissure width, fissure length, and fissure number) through uniaxial compression and Brazilian tests. Then, the digital speckle correlation method (DSCM) and acoustic emission (AE) technique are used to record the deformation and failure processes. Finally, the failure mechanisms of the layer‐crack structure are presented and discussed. Under compressive conditions, the failure process can be divided into compatible support, incompatible support, and postpeak unstable failure stages. An increase in fissure width, as well as fissure length or number, causes an increase in the inner damage accumulation and a decrease in the stiffness coefficient by decreasing the strain of the compatible support stage. Thus, the bearing capacity of the layer‐crack structure is weakened. Under tensile conditions, the tensile ability decreases linearly as the fissure length increases, but the vertical pressure acting on the fissure increases linearly as the fissure width increases. Thus, the tensile strength of the layer‐crack structure decreases as the fissure length (or width) increases.

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“…Heng et al (2015) conducted direct shear tests to study the mechanical properties of layer planes and the shear strength of shale with different layer orientations. More examples like Arora et al (2015), Geng et al (2016) and Al-Maamori et al (2019)…”

Section: Introductionmentioning

confidence: 99%

Mutual interference of layer plane and natural fracture in the failure behavior of shale and the mechanism investigation - A numerical study

Zhao¹,

Xie²,

Fan³

et al. 2019

Preprint

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• PFC-based numerical model are conducted to simulate the failure behavior of layered shale with natural fracture under Brazilian tests. • Complex interference of layer plane and natural fracture in failure strength and fracture pattern of shale are clarified. • Damage modes, micro cracks and sensitivity of tensile/cohesion strength are recognized quantitatively during loading/failure process.

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Investigation of the failure mode of shale rocks in biaxial and triaxial compression tests

Cited by 47 publications

References 1 publication

An investigation of failure modes and failure criteria of rock in complex stress states

An investigation of failure modes and failure criteria of rock in complex stress states

Experimental study on the failure mechanism of layer‐crack structure

Mutual interference of layer plane and natural fracture in the failure behavior of shale and the mechanism investigation - A numerical study

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