An empirical failure criterion for rocks and jointed rock masses

Sheorey, P.R.; Biswas, Apratim; Choubey, Vishnu D.

doi:10.1016/0013-7952(89)90003-3

Cited by 84 publications

(52 citation statements)

References 7 publications

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“…The Coulomb criterion and Hoek-Brown criterion have been widely applied in rock engineering [3][4][5][6], and they assume that the intermediate principal stress has no influence on rock failure. The conventional triaxial compression tests of cylindrical specimens are carried in laboratories all over the world, and vast data of various rocks have been presented, meanwhile numerous strength criteria have been proposed and studied [7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the accuracy of some conventional triaxial strength criteria for intact rock

Mingqing¹

2011

International Journal of Rock Mechanics and Mining Sciences

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Section: Introductionmentioning

confidence: 99%

Comparison of the accuracy of some conventional triaxial strength criteria for intact rock

Mingqing¹

2011

International Journal of Rock Mechanics and Mining Sciences

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“…Так, в статье (Sheorey, Biswas, & Choubey, 1989) показано, как пять параметров испытания на трехосное сжатие, в частности проч-ность на сжатие, разрыв и сдвиг, коэффициент тре-ния и сцепление могут быть связаны между собой тремя уравнениями. Соблюдение критерия разруше-ния изучалось в условиях породного массива уголь-ных пластов, горных выработок и целиков.…”

Section: обзор исследованийunclassified

Failure criteria for structurally heterogeneous materials

Shashenko¹,

Kovrov²,

Rakishev³

2016

Min. miner. depos.

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Purpose. To analyze the current research regarding rock failure criteria and justify the analytical failure criterion for structurally heterogeneous materials in three dimensional stress-strain state.Methods. The study is based on an integrated approach with the use of analysis and synthesis of literature on the issues related to failure of the rock with heterogeneous structure, and application of analytical and empirical failure criteria to assess the strength of rocks. Findings.The analytical failure criterion is compared with the results of testing rocks in three dimensional stress-strain state. It is proposed to assess the degree of danger of the rock media failure for any point of homogeneous rock mass in the vicinity of mine working through the safety factor n , by comparing the value of equivalent stress e σ with tensile strength in uniaxial compression c R . Application of structural attenuation coefficient c k allows to pass from assessment of the rock sample strength to the evaluation of strength of the real structurally inhomogeneous rock mass.Originality. Failure criterion for structurally heterogeneous bodies with defects in the form of joint system which allows to adequately assess stability of the rock mass is proposed. Practical implications.Comparison of the analytical criterion with the results of laboratory testing of structurally heterogeneous materials in three dimensional stress state allows to predict rock failure in the massif with the accuracy of 94%. Keywords: failure criteria, structurally heterogeneous material, safety factor, tensile strength in uniaxial compression, equivalent stress, coefficient of the rock mass structural attenuation ВВЕДЕНИЕПри монотонном нагружении критерий разруше-ния представляет собой точечное условие потери несущей способности нагруженного твердого тела. Выбор адекватного критерия разрушения горных пород является одной из ключевых проблем в геоме-ханике. В случае одноосного напряженного состоя-ния критерий разрушения оценивается предельным (нормативным) значением напряжения, при котором теряется структурная целостность исследуемого тела. Это пределы прочности на одноосное сжатие, растя-жение и сдвиг. В геомеханике объектом исследова-ния, как правило, является объемное напряженно-деформированное состояние неоднородного массива горных пород, поэтому от выбора и применения кри-терия разрушения зависит точность геотехнических расчетов. Приоритет дается тем критериям, которые достаточно хорошо описывают поведение как одно-родного, так и неоднородного породного массива находящегося в объемном напряженном состоянии.Цель данной работы заключается в анализе суще-ствующих исследований критериев разрушения гор-ных пород и обосновании аналитического критерия разрушения для структурно неоднородных материа-лов, находящихся в объемном напряженно деформи-рованном состоянии.

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“…Failure is assessed using a well known empirical rock failure criterion proposed by Balmer (1952) and Sheorey et al (1989). According to the criterion, for a given rock, the major principal stress required for the rock to fail (r 1 ) is given by:…”

Section: Failure Criterionmentioning

confidence: 99%

Numerical Studies on Chip Formation in Drag-Pick Cutting of Rocks

Loui

Karanam

2011

Geotech Geol Eng

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A two dimensional non-linear finite element simulation model has been developed using a mathematical model for progressive rock failure for understanding the mode and sequence of rock failure under a drag pick cutter. Rock cutting simulation has also been done using linear elastic modeling using local stability factor contouring. It has been observed from the simulation results that during negative rake angle cutting the chipping occurs by shear failure of the elements. Whereas, in positive rake angle cutting, some elements were observed to fail in shear and some under tension. The predicted peak cutting force using the developed models was found to be up to 25% higher than the experimental values. The effect of input parameters such as rake angle, flank wear, depth of cut and rock properties on the predicted peak cutting force has been studied, verified from earlier experimental studies and compared with some earlier proposed theories on rock cutting. The elastic stress analysis model based on the stability factor contouring method has also been found to be an effective tool to bracket the expected peak cutting force for a given operational and rock parameters but failed to simulate the effect of pick geometry (rake angle) correctly. The non-linear simulation model using progressive rock element failure is superior to elastic linear stress analysis model by simulating the correct trends for all the rock and machining parameters.

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An empirical failure criterion for rocks and jointed rock masses

Cited by 84 publications

References 7 publications

Comparison of the accuracy of some conventional triaxial strength criteria for intact rock

Comparison of the accuracy of some conventional triaxial strength criteria for intact rock

Failure criteria for structurally heterogeneous materials

Numerical Studies on Chip Formation in Drag-Pick Cutting of Rocks

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