A new failure criterion for transversely isotropic rocks

Cazacu, Oana; Cristescu, N.; Shao, Jian-Fu

doi:10.1016/s0148-9062(98)00145-4

Cited by 12 publications

(8 citation statements)

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“…Lekhnitskii et al [8] general equation of anisotropic elastic theory is derived, which provides a theoretical basis for the study of anisotropic problems. On these bases, Nova [9] and Cazacu et al [10] and Lee and Pietruszczak [11] put forward different anisotropic strength criteria. Vernik and Nur [12] studied the wave velocity anisotropy of black organic shale and concluded that the anisotropy of black shale is mainly caused by its own microstructure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Difference of Shale Mechanical Properties

Liu

Sun

et al. 2021

Advances in Civil Engineering

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This paper studies the anisotropic characteristics of shale and the difference in mechanical performance between deep shale and outcrop shale. The outcrop shale was collected from the Shuanghe section in Changning County, southern Sichuan, and the deep shale was collected from the Wells Yi201 and Lu202. Study their basic mechanical parameters, failure modes, and wave velocity responses through laboratory tests. Research shows that with the increase of bedding angle, the deformation mode has the trend from elastic deformation to plastic deformation in high-stress state. When the bedding angles are 0°, 30°, and 45°, the weak bedding surface plays a leading role in the formation of the failure surface trend. As the bedding angle increases to 60° and 90°, its influence is weakened. The tensile strength, elastic modulus, and wave velocity decrease with the increase of bedding angle. The compressive strength and Poisson’s ratio have the law of U-type change, there are higher values at 0° and 90°, and the lowest values are at 30°. The brittleness index first increases and then decreases with the increase of the bedding angle. The tensile strength and Poisson’s ratio of outcrop shale and deep shale are close, but the compressive strength of deep shale is only 1/3 of outcrop shale, the elastic modulus is only 3/4 of outcrop shale, and the failure of deep shale is accompanied by instability failure.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Difference of Shale Mechanical Properties

Liu

Sun

et al. 2021

Advances in Civil Engineering

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“…Over the past several decades, numerous tests, numerical simulations, and analytical calculations on failure modes and mechanical properties have been completed [4][5][6][7]. e fracture behaviour under triaxial pressure has been found to differ from that under uniaxial pressure [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Confining Pressure on the Dynamic Compression Properties of Transversely Isotropic Rocks

Zhang

Feng

et al. 2019

Advances in Civil Engineering

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e dynamic compression properties of transversely isotropic rocks and their dependence on the confining pressure and bedding directivity are important in deep underground engineering activities. In this study, a slate is characterized using a split Hopkinson pressure bar (SHPB) test. Five groups of samples with preferred bedding directions (dip angles of 0°, 30°, 45°, 60°, and 90°) are subjected to coupled axial impact loading (low, medium, and high) under confining pressure (0, 5, and 10 MPa). e failure mode, dynamic strength, and Young's modulus are investigated. e test results show that the tensile splitting effect is significant when there is no confining pressure. However, under a confining pressure (5 and 10 MPa) condition, the cracks that develop along the loading direction can be significantly constrained and the samples are forced to fail along the bedding plane. With increasing confining pressure, the critical dynamic strength significantly increases, and Young's modulus increases when θ ≥ 45°while it decreases when θ ≤ 30°.

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“…According to the assumption and the treatment method, they can be divided into two main categories, continuity criteria and discontinuity criteria. For continuity failure criteria, some progress has been made in its mathematical approach and empirical theory (Nova et al, 1980;Cazacu et al, 1998;Pietruszczak et al, 2002;Parisio et al, 2018). However, for the rock mass with strong discontinuity, the simulation of their anisotropic strength property by continuity criteria, and the value of relevant parameters still need to be further enhanced.…”

Section: Introductionmentioning

confidence: 99%

Investigation Into Deformation and Failure Characteristics of the Soft-Hard Interbedded Rock Mass Under Multiaxial Compression

Shao

et al. 2022

Front. Earth Sci.

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The influence of loading path, intermediate principal stress and weak layers on the deformation property and failure characteristics of soft-hard interbedded rock mass is initially discussed in this study. First, the laboratory experiments of multiaxial compression failure are carried out to soft-hard interbedded rock samples of Jinping. Three failure modes of rock samples caused by different distribution forms of weak layers under uniaxial compression and deformation property and failure characteristics of rock samples in different loading paths under biaxial compression are analyzed. Then, considering the property of strain softening, numerical models are established based on the elastic-brittle-plastic constitutive relation. The effect of weak layer dip angle, quantity, distribution form, and volume ratio on strength characteristics is further investigated. The results reveal that the failure mode of Jinping soft-hard interbedded rock samples generally follows the pattern of multi-fracture splitting under uniaxial compression, and the pattern of tension-shear damage under biaxial compression. The intermediate principal stress is positively correlated with the vertical failure loading. The number of weak layers has no significant effect on the “U” type strength characteristics of samples. However, as the number of weak layers increases, there is a tendency for the minimum of vertical failure loading to move forward in the direction of smaller dip.

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A new failure criterion for transversely isotropic rocks

Cited by 12 publications

References 0 publications

Experimental Study on the Difference of Shale Mechanical Properties

Experimental Study on the Difference of Shale Mechanical Properties

Effect of the Confining Pressure on the Dynamic Compression Properties of Transversely Isotropic Rocks

Investigation Into Deformation and Failure Characteristics of the Soft-Hard Interbedded Rock Mass Under Multiaxial Compression

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