Rock failure modes under uniaxial compression, Brazilian, and point load tests

Basu, Arindam; Mishra, Deepak; Roychowdhury, K.

doi:10.1007/s10064-013-0505-4

Cited by 217 publications

(95 citation statements)

References 29 publications

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“…Only one main crack appeared in tension test, which is almost perpendicular to the tensile direction, but several oblique cracks appeared in compression tests. All cracks observed in our simulation are similar to those observed in experiments presented in [47,48]. The properties of specimen A-E from the simulations are listed in Table 3.…”

Section: Specimen Preparationsupporting

confidence: 83%

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Ouyang

Chen

2017

Applied Sciences

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Abstract:The bonded-particle model (BPM) is a very efficient numerical method in dealing with initiation and propagation of cracks in rocks and can model the fracture processes and most of macro parameters of rocks well. However, typical discrete element method (DEM) underestimates the ratio of the uniaxial compressive strength to the tensile strength (UCS/TS). In this paper, a new DEM method with a nonlinear elastic tensile model embedded in BPM is proposed, which is named as nonlinear elastic tensile bonded particle model (NET-BPM). The relationships between micro parameters in NET-BPM and macro parameters of specimens are investigated by simulating uniaxial compression tests and direct tension tests. The results show that both the shape coefficient of the nonlinear elastic model and the bond width coefficient are important in predicting the value of UCS/TS, whose value ranging from 5 to 45 was obtained in our simulations. It is shown that the NET-BPM model is able to reproduce the nonlinear behavior of hard rocks such as Lac du Bonnet (LDB) granite and the quartzite under tension and the ratio of compressive Young's modulus to tensile Young's modulus higher than 1.0. Furthermore, the stress-strain curves in the simulations of LDB granite and the quartzite with NET-BPM model are in good agreement with the experimental results. NET-BPM is proved to be a very suitable method for modelling the deformation and fracture of rock-like materials.

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Section: Specimen Preparationsupporting

confidence: 83%

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Ouyang

Chen

2017

Applied Sciences

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“…There are various studies in the literature proposing relationship between I s(50) and UCS on different rock types but not on conglomerates individually: Oztruk and Altinpinar [6], Ferentinou and Fakir [7], Basu et al [8], Akram and Bakar [9], Quane and Russel [10], Kahraman [11], Fener et al [12], Basu and Aydin [13], Agustawijaia [14], Cobanoglu and Celik [15], Sabatakakis et al [16], Kahraman and Gunaydin [17]. Table 1 lists some of the equations correlating the UCS to I s(50) .…”

Section: Introductionmentioning

confidence: 99%

Prediction of the uniaxial compressive strength and Brazilian tensile strength of weak conglomerate

Minaeian

Ahangari

2017

Geo-Engineering

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“…sample and results in a high tensile stress. Central and layer activation mode might be seen in the samples which contain anisotropy and layering [27,28].…”

Section: Resultsmentioning

confidence: 97%

Water Saturation Induced Changes in the Indirect (Brazilian) Tensile Strength and the Failure Mode of Some Igneous Rock Materials

Yasar

Komurlu

2020

GSE

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The present study concentrates on water induced strength reduction and variation of the failure mode in indirect (Brazilian) tension tests of several igneous rock materials under three moisture cases of ovendry, air-dry and fully saturated states. In this respect, two andesite and three tuff materials which contain no visible flaws were subjected to indirect tensile strength tests using the Brazilian disc method. Once the tension tests were carried out, photographs of the broken samples were taken to investigate the changes in the failure mode. As a result, it was found that tensile strengths of the samples were highly reduced with the presence of the water and the natural humidity. Additionally, it has been deduced that the failure mode of the samples mainly shifts to central fracturing with the presence of natural moisture and saturation. Although the central crack is the ideal type for the theory of Brazilian tensile strength determination, indefinite contact properties like contact angle and frictions are some notable issues to make only considering failure shapes for the validity of the test results misleading.

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Rock failure modes under uniaxial compression, Brazilian, and point load tests

Cited by 217 publications

References 29 publications

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Prediction of the uniaxial compressive strength and Brazilian tensile strength of weak conglomerate

Water Saturation Induced Changes in the Indirect (Brazilian) Tensile Strength and the Failure Mode of Some Igneous Rock Materials

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