Feitao Zeng

École Polytechnique de Montréal

Hoek–Brown failure criterionUltimate tensile strengthApproximation errorHysteresisGeologyQuadratic equationExtrapolationMathematical analysisWork (thermodynamics)Mohr–Coulomb theoryBrittlenessTangentClosure (computer programming)Pyramid (geometry)Deformation (engineering)Oil shaleNonlinear systemComposite materialVoid ratioAbsorption of waterExtraction (military)MoistureCylinder stressIsotropyGeotechnical engineeringMaterials scienceModulusYoung's modulusTriaxial shear testConstitutive equationDeformation (meteorology)Overburden pressureRange (statistics)GeometryStress pathState (functional analysis)Shear bandStiffnessStrength theoryFriction angleMultiaxial testingFuture studiesStrength testingPrincipal stressAstm standardTriaxial compressionMulti axialCompressive strengthMathematicsStability (probability)Direct shear testRock mass classificationElastic modulusPistonCompression (geology)Stress–strain curveDisplacement (vector)MechanicsCohesion (geology)Structural engineeringLinear equationEffective stressAnisotropyContour lineStress (mechanics)StopingShear (geology)ThermodynamicsWedge (mechanical device)

13Publications

4H-index

88Citations

Publications 10

#1Ruofan Wang (École Polytechnique de Montréal)

Abstract Pillar recovery requires stable backfill upon side exposure in open stoping mining methods. Until now, the solutions used to estimate the required strength of side-exposed backfill are mainly based on a wedge model where the effect of rock-wall closure was neglected. In this paper, the influence of mine depth and adjacent extraction on the stability of side-exposed backfill is analyzed through numerical modeling with FLAC 3D. The failure mechanism and cohesion at failure (cf) of backfil...

A modified Hoek-Brown failure criterion for unsaturated intact shale considering the effects of anisotropy and hydration

#1Qiangui Zhang (SWPU: Southwest Petroleum University)H-Index: 6

#2Yao Bowei (SWPU: Southwest Petroleum University)H-Index: 1

Last. Zhao Pengfei (SWPU: Southwest Petroleum University)H-Index: 3

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Abstract The mechanical strength of shale is highly influenced by anisotropy and hydration, which cannot be ignored for the stability evaluation of the geotechnical structures related to shale after water invasion. In the present work, a modified Hoek-Brown failure criterion for unsaturated intact shale considering the effects of anisotropy and hydration has been developed in order to obtain an accurate strength evaluation for unsaturated intact shale. In this proposed failure criterion (abbrevi...

Determination of the Shear Strength of Rockfill from Small-Scale Laboratory Shear Tests: A Critical Review

#1Akram Deiminiat (École Polytechnique de Montréal)

#2Li Li (École Polytechnique de Montréal)

Last. Robert P. Chapuis (École Polytechnique de Montréal)H-Index: 34

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Determining the shear strength of rockfill is a key task for the design and stability analysis of rockfill structures. When direct shear tests are performed, the well-established ASTM standard requires that specimen width and thickness must be at least 10 and 6 times the maximum particle size (dmax), respectively. When the value of dmax is very large, performing such tests in laboratory with field rockfill becomes difficult or impossible. Four scaling-down techniques were proposed in the past to...

Geomechanical behaviors of shale after water absorption considering the combined effect of anisotropy and hydration

#1Qiangui Zhang (SWPU: Southwest Petroleum University)H-Index: 6

#2Xiangyu Fan (SWPU: Southwest Petroleum University)H-Index: 6

Last. Feitao Zeng (École Polytechnique de Montréal)H-Index: 4

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Abstract Geomechanical behaviors of shale in many geotechnical engineering areas, such as shale gas extraction, tunnel excavation, slope engineering, are highly influenced by anisotropy and hydration. In this work, a number of ϕ25 mm × 50 mm shale specimens were prepared with three levels of moisture contents and seven bedding plane orientations (β, in degrees) relative to the axial direction. A series of compression tests for these specimens was then conducted under four different confining pre...

#1Feitao Zeng (École Polytechnique de Montréal)H-Index: 4

#2Brian L. Folta (Golder Associates)H-Index: 1

Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32

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A true triaxial apparatus was designed and fabricated to achieve multi-axial stress states with prismatic specimens. The device, which is a modification of the University of Minnesota plane-strain apparatus, is equipped with piston assemblies that generate the intermediate principal stress. A closed-loop, servo-hydraulic load frame is used to control the major principal stress, while the minor principal stress is developed by fluid pressure. A stress path was developed to perform experiments und...

#1Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32

#2Feitao Zeng (DUT: Dalian University of Technology)H-Index: 4

Last. Yuan Li (USTB: University of Science and Technology Beijing)H-Index: 3

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Abstract A failure criterion typically is phenomenological since few models exist to theoretically derive the mathematical function. Indeed, a successful failure criterion is a generalization of experimental data obtained from strength tests on specimens subjected to known stress states. For isotropic rock that exhibits a pressure dependence on strength, a popular failure criterion is a linear equation in major and minor principal stresses, independent of the intermediate principal stress. A gen...

#1Feitao Zeng (UMN: University of Minnesota)H-Index: 4

#2Yuan Li (USTB: University of Science and Technology Beijing)H-Index: 3

Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32

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AbstractPaul-Mohr-Coulomb (PMC) failure criterion provides enhanced representations of pyramidal failure surfaces, with recognizable material parameters, by considering all three principal stresses...

#1Feitao Zeng (DUT: Dalian University of Technology)H-Index: 4

#2Ali Tarokh (UMN: University of Minnesota)H-Index: 8

Last. Joseph F. LabuzH-Index: 32

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Recognition of the Stress-Strain Curve Based on the Local Deformation Measurement of Soil Specimens in the Triaxial Test

#1Longtan Shao (DUT: Dalian University of Technology)H-Index: 8

#2G. Liu (DUT: Dalian University of Technology)H-Index: 1

Last. Xing-sen Guo (DUT: Dalian University of Technology)H-Index: 6

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A digital image technique was developed and used to measure the deformation distribution over the entire surface of soil specimens in triaxial tests. The measured deformation process shows that the specimen apparently exhibits three states during the test, i.e., pre-failure, in-failure, and post-failure, in correspondence to the different features of its deformation. The deformation feature in each state is then analyzed by the displacement and strain contours. Additionally, the stress level, S,...

#1Feitao Zeng (DUT: Dalian University of Technology)H-Index: 4

#2Longtan Shao (DUT: Dalian University of Technology)H-Index: 8

In this paper, digital image technology was used in the surface-deformation measurement of soil, making it possible to monitor the axial, radial, and volumetric deformations and the deformation distribution over the entire surface of specimens in triaxial tests. A series of cyclic triaxial tests on silica powder and Fujian sand were conducted to investigate the stress-strain behavior of sand in pre-failure deformation, particularly in the unloading elastic behavior. The sand gradually tended tow...