A modified failure criterion for transversely isotropic rocks

Saeidi, Omid; Rasouli, Vamegh; Vaneghi, Rashid Geranmayeh; Gholami, Raoof; Torabi, Seyed Rahman

doi:10.1016/j.gsf.2013.05.005

Cited by 106 publications

(38 citation statements)

References 20 publications

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“…The mechanical properties of these rocks vary with directions. A number of research studies have been carried out to reveal the influence of anisotropy on the strength properties in rocks under quasi-static loading [4,5,12,21,22,[45][46][47][48]59]. However, only few studies consider the combined effects of both water and anisotropy.…”

Section: Influence Of Bedding/foliation and Water Contentmentioning

confidence: 99%

Water effects on rock strength and stiffness degradation

2015

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Reduction in strength and stiffness in rocks attributed to an increase in water content has been extensively researched on a large variety of rock types over the past decades. Due to the considerable variations of texture and lithology, the extent of water-weakening effect is highly varied among different rock types, spanning from nearly negligible in quartzite to 90 % of uniaxial compressive strength reduction in shale. Readers, however, often face difficulties in comparing the data published in different sources due to the discrepancy of experimental procedures of obtaining the water saturation state and how the raw laboratory data is interpreted. In view of this, the present paper first reviews the terminologies commonly used to quantify the amount of water stored in rocks. The second part of the paper reviews the water-weakening effects on rock strengths, particularly focusing on uniaxial compressive strength and modulus, as well as tensile strength, under quasi-static loading and dynamic loading. The correlation relationships established among various parameters, including porosity, density and fabric of rocks, and external factors such as strain rate, surface tension and dielectric constant of the saturating liquid, absorption percentage and suction pressure, are reviewed and presented toward the end of the paper.

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Section: Influence Of Bedding/foliation and Water Contentmentioning

confidence: 99%

Water effects on rock strength and stiffness degradation

2015

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“…[3], it is assumed that the sphere is made of a transversely isotropic material m 1 ≠1 in which the elastic modulus E 0 is kept constant, but 0 E is varied such that the anisotropic parameter m 1 changes from 1 to 3. The assumed range of m 1 is reasonable because there are several cases in which m 1 is even higher than 3 [25,32,33]. For instance, the ratio of anisotropy m 1 for graphite is obtained as 3.5 [25].…”

Section: The Effect Of Inhomogeneity and Anisotropymentioning

confidence: 96%

General thermo-elastic solution of radially heterogeneous, spherically isotropic rotating sphere

Bayat

Toussi

2015

J Mech Sci Technol

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A thick walled rotating spherical object made of transversely isotropic functionally graded materials (FGMs) with general types of thermo-mechanical boundary conditions is studied. The thermo-mechanical governing equations consisting of decoupled thermal and mechanical equations are represented. The centrifugal body forces of the rotation are considered in the modeling phase. The unsymmetrical thermo-mechanical boundary conditions and rotational body forces are expressed in terms of the Legendre series. The series method is also implemented in the solution of the resulting equations. The solutions are checked with the known literature and FEM based solutions of ABAQUS software. The effects of anisotropy and heterogeneity are studied through the case studies and the results are represented in different figures. The newly developed series form solution is applicable to the rotating FGM spherical transversely isotropic vessels having nonsymmetrical thermo-mechanical boundary condition.

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“…The estimation of anisotropic mechanical properties for these rock masses is critically important in rock engineering applications such as rock slope, rock tunnel, underground excavation, etc. To fully capture the mechanical properties of anisotropic rock masses, many laboratory studies have been performed on the sedimentary rocks [4,5] and jointed rock masses [6][7][8]. The results obtained from those laboratory tests indicate that the weakness orientation largely influences the failure strength of rock masses.…”

Section: Introductionmentioning

confidence: 99%

Joint Elasticity Effect on the Failure Behaviours of Rock Masses using a Discrete Element Model

et al. 2018

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It is widely accepted that the mechanical properties and failure behaviours of a rock mass are largely dependent upon the geometrical and mechanical properties of discontinuities. The effect of joint elasticity on the failure behaviours of rock masses is investigated using a discrete element model, namely, the synthetic rock mass model. Here, uniaxial compression tests of the numerical model are carried out for the rock mass model with a persistent joint to analyse the role of joint elasticity in the failure process with various joint orientations, β. A strong correlation between the joint elasticity and failure strength is found from the simulation results: a positive relationship when the joint orientation β < φ j ; a negative relationship when the joint orientation φ j < β < 90 ° ; and a very limited effect when the joint orientation β = 90 ° . Additionally, it is shown that the joint elasticity is the governing factor in the transition of failure modes, especially from the sliding failure mode along the joint to the mixed sliding-tensile failure mode.

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A modified failure criterion for transversely isotropic rocks

Cited by 106 publications

References 20 publications

Water effects on rock strength and stiffness degradation

Water effects on rock strength and stiffness degradation

General thermo-elastic solution of radially heterogeneous, spherically isotropic rotating sphere

Joint Elasticity Effect on the Failure Behaviours of Rock Masses using a Discrete Element Model

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