Rock tensile strength and its relationship to a number of alternative measures of rock strength

Hobbs, D. W.

doi:10.1016/0148-9062(67)90009-5

Cited by 42 publications

(17 citation statements)

References 5 publications

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“…The simple processing of samples enables a quick experimental check-up of the theoretical presumptions and their numerical analyses (Hiramatsu and Oka, 1966;Barla and Innaurato 1973;Sundaram and Corrales 1980;Lavrovetal, 2002;Yue et al, 2003;Yu et al, 2006;Lanaro et al, 2009;Yu et al, 2009;Markides and Kourkoulis, 2012;Li and Wong, 2013;). However, the sensitivity to the testing conditions requires a careful explanation of the material behaviour during the testing and finding the solutions for removal of the flaws (Hobbs, 1964(Hobbs, , 1965(Hobbs, , 1967. ; Hudson, 1969;Hudson et al, 1972;Yanagidani et al, 1978;Lajtai, 1980;Pandey and Singh, 1986;Newman and Bennett, 1990 In the future it is expected that more attention will be paid to other differences among the specific types of rock materials, such as the petrographic characteristics, for example.…”

Section: Discussionmentioning

confidence: 99%

“…Afterwards, such a criterion was used in the rock mechanics in its original and modified forms, suggested by McClintock and Walsh (1962). A large number of papers on the Brazilian test comprises this criterion (Hobbs, 1964(Hobbs, , 1965(Hobbs, and 1967Fairhurst 1964;Colback, 1966;Linetal, 2015). Although other criteria are more frequently used today, the area of tensile strength is modified according to Griffith, as it was done, e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Assuming that the material is homogeneous, linearly elastic and isotropic, Hondros (1959) performed a complete solution of the stress in the case when the load was distributed over the finite arcs with diametric compression, comprising both, the discs and the cylinders. Hobbs (1964Hobbs ( , 1965Hobbs ( and 1967 was engaged in calculations of tensile strength on several occasions. He calculated it by diametrical compression of a disk with a central hole (ring test).…”

Section: Historical Overview Of Development Of Brazilian Testmentioning

confidence: 99%

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Current Cognition of Rock Tensile Strength Testing by Brazilian Test

Briševac

Kujundžić

Čajić³

2015

MGPB

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Tensile strength of intact rock materials has been determined by the indirect method more frequently than by the direct method. This paper presents a historical review of the development of the indirect method called the Brazilian test, comprising the period from 1943 to the present day. It stresses some aspects which are essential for interpreting the results of the Brazilian test due to the different degrees of stress during the testing and the direct method of determining tensile strength. The estimate of the direct tensile strength and the influence of sample saturation on the results of indirect tensile strength testing have been specifically elaborated.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Historical Overview Of Development Of Brazilian Testmentioning

confidence: 99%

See 1 more Smart Citation

Current Cognition of Rock Tensile Strength Testing by Brazilian Test

Briševac

Kujundžić

Čajić³

2015

MGPB

View full text Add to dashboard Cite

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“…Hobbs investigated the variation of the tensile strength of the laminated rock using Griffith crack theory [62], Nova and Zaninetti proposed an anisotropic tensile failure criterion for schistose rock [63], and Lee and Pietruszczak proposed the tensile equivalent of the SPW theory and a novel 3-D tensile failure function for transversely isotropic rocks [21]. In this paper, the tensile equivalent of the SPW theory was used, which assumes that every physical plane with the exception of weakness plane has identical tensile strength.…”

Section: Modeling Of "Bts" Under Tensile Failure Modesmentioning

confidence: 99%

Brazilian Tensile Strength of Anisotropic Rocks: Review and New Insights

Peng

Zhu

et al. 2018

Energies

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Strength anisotropy is one of the most distinct features of anisotropic rocks, and it also normally reveals strong anisotropy in Brazilian test Strength ("BtS"). Theoretical research on the "BtS" of anisotropic rocks is seldom performed, and in particular some significant factors, such as the anisotropic tensile strength of anisotropic rocks, the initial Brazilian disc fracture points, and the stress distribution on the Brazilian disc, are often ignored. The aim of the present paper is to review the state of the art in the experimental studies on the "BtS" of anisotropic rocks since the pioneering work was introduced in 1964, and to propose a novel theoretical method to underpin the failure mechanisms and predict the "BtS" of anisotropic rocks under Brazilian test conditions. The experimental data of Longmaxi Shale-I and Jixi Coal were utilized to verify the proposed method. The results show the predicted "BtS" results show strong agreement with experimental data, the maximum error is only~6.55% for Longmaxi Shale-I and~7.50% for Jixi Coal, and the simulated failure patterns of the Longmaxi Shale-I are also consistent with the test results. For the Longmaxi Shale-I, the Brazilian disc experiences tensile failure of the intact rock when 0 • ≤ β w ≤ 24 • , shear failure along the weakness planes when 24 • ≤ β w ≤ 76 • , and tensile failure along the weakness planes when 76 • ≤ β w ≤ 90 • . For the Jixi Coal, the Brazilian disc experiences tensile failure when 0 • ≤ β w ≤ 23 • or 76 • ≤ β w ≤ 90 • , shear failure along the butt cleats when 23 • ≤ β w ≤ 32 • , and shear failure along the face cleats when 32 • ≤ β w ≤ 76 • . The proposed method can not only be used to predict the "BtS" and underpin the failure mechanisms of anisotropic rocks containing a single group of weakness planes, but can also be generalized for fractured rocks containing multi-groups of weakness planes.

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“…Among the CO2 sequestration methods, mineral route of carbonation, especially of alkaline earth oxide bearing rocks, has proven to be an effective means [4,[8][9][10][11][12][13]. The high compressive and tensile strength of secondary carbonate rocks [14][15][16], formed as a result of mineral trapping, suggests the possibility of using mineral carbonation to form a sustainable binder for construction.…”

Section: Introductionmentioning

confidence: 99%

Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

Das

Stone

Convey

et al. 2014

Materials Characterization

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The pore-and micro-structural features of a novel binding material based on the carbonation of waste metallic iron powder is reported in this paper. The binder contains metallic iron powder as the major ingredient, followed by additives containing silica and alumina to facilitate favorable reaction product formation. Compressive strengths sufficient for a majority of concrete applications are attained. The material pore structure is investigated primarily through mercury intrusion porosimetry whereas electron microscopy is used for microstructural characterization. Reduction in the overall porosity and the average pore size with an increase in carbonation duration from 1 day to 4 days are noticed. The pore structure features are used in predictive models for gas and moisture transport (water vapor diffusivity and moisture permeability) through the porous medium which dictates its long-term durability when used in structural applications. Comparisons of the pore structure with those of a Portland cement paste are also provided. The morphology of the reaction products in the iron-based binder, its elemental composition and the distribution of constituent elements in the microstructure are also reported.

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Rock tensile strength and its relationship to a number of alternative measures of rock strength

Cited by 42 publications

References 5 publications

Current Cognition of Rock Tensile Strength Testing by Brazilian Test

Current Cognition of Rock Tensile Strength Testing by Brazilian Test

Brazilian Tensile Strength of Anisotropic Rocks: Review and New Insights

Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

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