A Laboratory Shear Cell Used for Simulation of Shear Strength and Asperity Degradation of Rough Rock Fractures

Different failure modes during fracture shearing have been introduced including dilation, sliding, asperity cut-off and degradation. Several laboratory studies have reported the complexity of these failure modes during shear tests performed under either constant normal load (CNL) or constant normal...

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Bibliographic Details
Published in:Rock mechanics and rock engineering 2013-07, Vol.46 (4), p.683-699
Main Authors: Asadi, M. S., Rasouli, V., Barla, G.
Format: Article
Language:English
Subjects:
Applied sciences
Asperity
Biodegradation
Buildings. Public works
Civil Engineering
Computer simulation
Degradation
Earth and Environmental Science
Earth Sciences
Exact sciences and technology
Failure modes
Fracture mechanics
Fracture toughness
Geophysics/Geodesy
Geotechnics
Measurements. Technique of testing
Original Paper
Rock
Rocks
Shear
Shear strength
Shear tests
Simulation
Soil mechanics. Rocks mechanics
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Summary:Different failure modes during fracture shearing have been introduced including dilation, sliding, asperity cut-off and degradation. Several laboratory studies have reported the complexity of these failure modes during shear tests performed under either constant normal load (CNL) or constant normal stiffness (CNS) conditions. This paper is concerned with the mechanical behaviour of synthetic fractures during direct shear tests using a modified shear cell and related numerical simulation studies. The modifications made to an existing true triaxial stress cell (TTSC) in order to use it for performing shear tests under CNL conditions are presented. The large loading capacity and the use of accurate hydraulic pumps capable of applying a constant shear velocity are the main elements of this cell. Synthetic mortar specimens with different fracture surface geometries are tested to study the failure modes, including fracture sliding, asperity degradation, and to understand failure during shearing. A bonded particle model of the direct shear test with the PFC2D particle flow code is used to mimic the tests performed. The results of a number of tests are presented and compared with PFC2D simulations. The satisfactory results obtained both qualitatively and quantitatively are discussed.
ISSN:0723-2632
1434-453X
DOI:10.1007/s00603-012-0322-2