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True Triaxial Tests on Natural Shanghai Clay
2018Drained true triaxial tests on undisturbed and remolded Shanghai silty clay were carried out to investigate the influence of intermediate principle stress on the strength and deformation of natural clay. Test results show that not only the shear strength, but also the volume change of Shanghai clay decreases with the increase of Lode angle θ. The shear
Guan-lin Ye +3 more
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DEM simulations of sandstone under true triaxial compressive tests
Acta Geotechnica, 2016Numerically simulated true triaxial compression tests (σ 1 ≥ σ 2 ≥ σ 3) are conducted in this study to elucidate the failure mechanism of sandstone using 3D discrete element method (DEM), in particular the effect of the intermediate principal stress (σ 2 ...
K. Duan, C. Y. Kwok, X. Ma
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A Small True Triaxial Apparatus with Wave Velocity Measurement
Geotechnical Testing Journal, 2005Abstract This paper describes a new cubical, true triaxial apparatus recently developed at the University of Western Australia (UWA). The apparatus is a stand-alone unit of the rigid type, where three pairs of pistons can be pressurized to impose three independent, rectilinear stresses on a sample of 250 mm side length. The sample can be
MA Ismail, SS Sharma, M Fahey
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Results of true triaxial strength tests on rock salt
Engineering Fracture Mechanics, 1990Abstract Knowledge of the thermomechanical properties of rock salt is important for the dimensioning of a permanent repository for radioactive wastes in a salt dome and for the necessary safety analysis, as well as for the design of mines and caverns.
U Hunsche, H Albrecht
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A True Triaxial Cell for Soil and Rock
1988The design and performance of a membrane-piston, high-pressure (σ2 − σ3 ≦ 300 MN/m2) cell are presented. This device is similar to the one used for standard triaxial tests differing only in the stresses, σ2 and σ3, which are independently applied through flexible polyvinyl chloride (PVC) fluid cushions on prismatic specimens.
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True Triaxial Stresses and the Brittle Fracture of Rock
Pure and Applied Geophysics, 2006This paper reviews the efforts made in the last 100 years to characterize the effect of the intermediate principal stress σ2 on brittle fracture of rocks, and on their strength criteria. The most common theories of failure in geomechanics, such as those of Coulomb, and Mohr, disregard σ2 and are typically based on triaxial testing of cylindrical rock ...
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Why does the World Need a True Triaxial Tester?
Particle & Particle Systems Characterization, 2007AbstractThe necessity for intensified research in the field of powder flow behavior is illustrated in this paper. It is argued that recent developments with respect to discrete element modeling, measurement techniques (AFM) and multidisciplinary approaches are particularly helpful in the understanding of powder flow behavior.
Richard Janssen, Marco Verwijs
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Behaviour of carbonated rocks under true triaxial compression
2011A true triaxial testing device has been developed in the nineties in the mining department of the Faculty of Engineering, Mons-Belgium. Since then data have been gathered from several rocks, among which various carbonated rocks exhibiting different mechanical behaviours.
Descamps, Fanny +4 more
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Development of a True Triaxial Testing Facility for Composite Materials
2000An electromechanical testing facility capable of applying any combination of tensile and/or compressive forces to three mutually orthogonal axes of a thickness-tapered composite cruciform specimen was designed, fabricated, assembled, and evaluated. Any stress ratio in biaxial (σ1 - σ2) or triaxial (σ1 - σ2 - σ3) stress space can be explored using this ...
JS Welsh, DF Adams
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A true triaxial cell for testing cylindrical rock specimens
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1995In this paper a new true triaxial cell, capable of routine testing of cylindrical rock core plugs under realistic 3-D polyaxial stress states, has been conceived by the author, the design of which is outlined. The cell presents the opportunity to develop enhanced realism when testing cylindrical rock specimens.
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