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Continuous failure state direct shear tests [PDF]
Rock Mechanics and Rock Engineering, 1984 The paper deals with a new testing procedure aimed at determining the failure envelopes for peak and residual strength in direct shear tests. In a “continuous failure state” direct shear test the specimen is maintained in a state of permanent sliding while the shear and normal stress are being steadily changed.
Andreas Tisa, Kalman Kovári
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Discrete-continuum analysis of shear banding in the direct shear test
Géotechnique, 2007The direct shear test is a widely used method for determining peak and critical state strength parameters for soil and for soil-manufactured material interfaces. The objective of this research was to examine the direct shear test by way of a discrete-continuum approach.
Jianfeng Wang +2 more
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Acta Geotechnica, 2016
This paper presents a series of cyclic 2D direct shear tests on sand–rough material interfaces under constant normal load (CNL) and constant normal stiffness (CNS) conditions. The aim of these tests is to describe the behavior of the soil–pile contact subjected to a large number of cycles due to environmental or anthropic loadings.
Pra-Ai, S., Boulon, M.
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This paper presents a series of cyclic 2D direct shear tests on sand–rough material interfaces under constant normal load (CNL) and constant normal stiffness (CNS) conditions. The aim of these tests is to describe the behavior of the soil–pile contact subjected to a large number of cycles due to environmental or anthropic loadings.
Pra-Ai, S., Boulon, M.
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A Direct Shear Test with Drainage Control
1953Shearing strength data are presented as a function of intergranular pressure on the sample just before start of shear and maximum intergranular pressure in the past. Strengths by “controlled” direct shear tests, with prevention of change in sample thickness used to approximate a no-drainage condition during shear, are shown to be in reasonable ...
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Numerical modelling of the direct shear test
Rudarsko-metalurški zbornik, 1995Laboratory test results for the determination of shear strength on marly-limestone are presented. Apparatus AMP-1 was used, constructed for testing of medium size samples. These results were also used for numerical analyses with FLAC - finite difference code.
Kovačević Zelić, Biljana +1 more
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Direct shear testing of polished slickensided surfaces
Landslides, 2010A series of ring shear and direct shear tests were performed to measure the drained residual strength of three clay soils. For each of the soils, slickensided direct shear specimens were prepared by wire-cutting intact specimens, and polishing the resulting shear plane on a variety of surfaces to align the clay particles in the direction of shear ...
Thomas L. Brandon +3 more
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Fabric evolution in a numerical direct shear test
Computers and Geotechnics, 2009Abstract This paper presents a three-dimensional discrete element study on the mechanical behaviour and fabric changes of elongated particle assemblages in a direct shear test. Assemblages with elongated particles are prepared under different preparation methods: random placing and deposition.
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Multistage Direct Shear Testing of Unsaturated Soils
Geotechnical Testing Journal, 1988Abstract A conventional direct shear box was modified to accommodate the testing of an unsaturated soil. The design concepts and necessary modifications to the apparatus are described. A multistage testing procedure is outlined. Typical results from direct shear tests are presented. The results illustrate the relationship between suction
Delwyn G. Fredlund, KJ Gan
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Use of Borehole Shear Test to Obtain Shear Strength Data Comparison to Direct Shear Test
2018The knowledge of shear strength geotechnical parameters, cohesion and friction angle, is necessary for many engineering works and slope stability analysis. Traditionally, the Direct Shear Test (DST) in the laboratory is used to determine these parameters.
R. M. Sbroglia +4 more
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Direct shear machine for testing rock joints
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1985Abstract Most direct shear machines are designed for soil testing or research and have serious limitations when used for rock joint testing by commercial testing laboratories. To overcome some of these limitations, a machine has been designed that uses split cylindrical specimen holders to encapsulate rock specimens in the field ...
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