A modified empirical criterion for strength of transversely anisotropic rocks with metamorphic origin

Saeidi, Omid; Vaneghi, Rashid Geranmayeh; Rasouli, Vamegh; Gholami, Raoof

doi:10.1007/s10064-013-0472-9

Cited by 41 publications

(14 citation statements)

References 26 publications

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“…He introduced an instructive analysis of the case in which rocks contain a well-defined parallel discontinuity. Many investigations (Duveau and Shao 1998;Tien and Kuo 2001) continued Jaeger's work to express the strength along discontinuities, as well as the proposing of new empirical criteria to determine the strength of transversely anisotropic rocks (Saeidi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

New methodology for estimating the shear strength of layering in slate by using the Brazilian test

Garcia-Fernandez

González‐Nicieza

Álvarez‐Fernández

et al. 2018

Bull Eng Geol Environ

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A new method is proposed in order to estimate the shear strength of schistosity planes in slate in terms of Mohr-Coulomb cohesion and internal friction angle. The procedure consists in carrying out the Brazilian method under different loading-foliation angles, for which experimental tests were achieved in slates from the northwest of the Iberian Peninsula (Spain). The experimental fracture patterns were analytically studied and justified by simulating the stress field in the discontinuity planes contained in the whole sample, taking into account the first failure registered in the tests. By combining experimental and analytical studies and a procedure based on the representation of the threshold state of stresses-in the elastic regime-in the failure plane, it is possible to estimate the foliation's strength envelope through a lineal adjustment according to the Mohr-Coulomb criterion and, thus, to characterize the layering. Finally, the proposed procedure was validated by the direct shear test. The cohesion and the internal friction angle obtained with this convenctional test were very close to that calculated by the proposed method, verifying the methodology developed by the authors. This procedure may be interesting in various engineering applications, either in the study of the properties of cleavage in slate, which is commonly used as an industrial rock, or in dam foundations, underground excavations and slope engineering, since one of the main failures in civil engineering is due to sliding along weak planes. KeywordsBrazilian test . Slate . Foliation . Internal friction angle . Cohesion . Strength parameters finished thickness. For this reason, slate is commonly used as 39 roofing or flooring, being an important economic sector in 40 Spain, which is the world leader in roofing slate production. 41 Besides its popular use in building, slate is frequently encoun-42 tered in various engineering applications, such as dam foun-43 dations, underground excavations and slope engineering 44 (Chen et al. 2016). Thus, to establish the mechanical proper-45 ties of jointed rocks along weak planes is important for 46 the exploitation, design and construction of civil engineering 47 works. 48 Direct shear testing is the favorable way to characterize the 49 discontinuities. The portable shear box described by Brown 50 and Walton (1975) is one of the most used testing systems in 51 order to calculate the cohesion and the internal friction angle 52 by assuming the Mohr-Coulomb criterion. Once the specimen * C. Gonzalez-Nicieza

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Section: Introductionmentioning

confidence: 99%

New methodology for estimating the shear strength of layering in slate by using the Brazilian test

Garcia-Fernandez

González‐Nicieza

Álvarez‐Fernández

et al. 2018

Bull Eng Geol Environ

View full text Add to dashboard Cite

show abstract

“…The above analysis has demonstrated the applicability of the modified Mohr-Coulomb criterion proposed in this paper for different rocks. This modified Mohr-Coulomb criterion addresses, to some extent, the limitations of the [58][59][60][61] Some well-known failure criteria, including the Parabolic Mohr-Coulomb criterion, 41 Revised Mohr-Coulomb criterion, 42 simplified failure criterion, 62 and Modified Hoek-Brown criterion 63 have been proposed and investigated for years. Therefore, it is worthwhile to compare the performances of the proposed modified criterion and these nonlinear criteria.…”

Section: Comparison Between Strength Criteriamentioning

confidence: 99%

Modified Mohr–Coulomb criterion for nonlinear strength characteristics of rocks

Xie,

Lin,

Chen

et al. 2024

Fatigue Fract Eng Mat Struct

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The classical Mohr–Coulomb criterion has an extremely wide range of applications in the field of engineering geology, while it cannot accurately characterize rock failure under high confining stresses. Therefore, a nonlinear modification is implemented based on the Mohr–Coulomb criterion for achieving wider usage in all stress environments. The cohesion and internal friction angle are firstly calculated by regression based on the triaxial experiments of diorite and other typical rocks in different confining stress ranges, and the variation modes of cohesion and internal friction angle are then formalized and integrated into the classical Mohr–Coulomb criterion. Using the experimental results of 435 triaxial compression tests in existing publications, the predictions of the modified criterion are compared with those of the previous nonlinear criteria, which show that the predicted values of the modified criterion are in good agreement with the measured strength. Compared with the previous nonlinear criteria, the modified criterion has a wider application range and always maintains a higher accuracy.

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“…Thirdly, a series of new strength criteria and a constitutive model, which considers the influence of confining pressure, was proposed, for example, the GZZ strength criterion, the uniform strength criterion, and the elastoplastic damage constitutive model, etc. (Saeidi et al, 2013;Singh et al, 2015). In addition, several scholars devoted to the influence of confining pressure on the creep mechanical behavior and gas tightness characteristics of soft rock, such as Lyu and Liu, have investigated the creep gas tightness characteristics through experiments and proposed a corresponding creep-damage constitutive model (Lyu et al, 2021;Lyu et al, 2022).…”

Section: Open Access Edited Bymentioning

confidence: 99%

Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

et al. 2023

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The accurate understanding of the influence of confining pressure on the mechanical characteristics of soft rock and how to comprehensively consider this influence in the elastoplastic analysis of tunnels are the fundamental premises for the effective evaluation of the deformation control and stability of soft rock tunnels. Therefore, this paper firstly investigates the effect of confining pressure on the deformation and strength characteristics of phyllite and slate, using triaxial experiment results and proposed variable models for the mechanical parameters (E, v, c, φ) of soft rock with confining pressure variation. Secondly, according to the second stress state around tunnels and these variable models for the mechanical parameters of soft rock, a new elastoplastic solution for tunnels is devised, which simultaneously considers the effect of confining pressure on the deformation and strength characteristics of the surrounding rock. Finally, with the proposed elastoplastic solution, the effect of multiple factors (initial pressure, supporting force, and tunnel radius) on the stress and displacement of tunnel surrounding rock is analyzed.

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A modified empirical criterion for strength of transversely anisotropic rocks with metamorphic origin

Cited by 41 publications

References 26 publications

New methodology for estimating the shear strength of layering in slate by using the Brazilian test

New methodology for estimating the shear strength of layering in slate by using the Brazilian test

Modified Mohr–Coulomb criterion for nonlinear strength characteristics of rocks

Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

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