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Shear Band Formation in Plane Strain Experiments of SandA series of biaxial (plane strain) experiments were conducted on three sands under low (15 kPa) and high (100 kPa) confining pressure conditions to investigate the effects of specimen density, confining pressure, and sand grain size and shape on the constitutive and stability behavior of granular materials. The three sands used in the experiments were fine-, medium-, and coarse-grained uniform silica sands with rounded, subangular, and angular grains, respectively. Specimen deformation was readily monitored and analyzed with the help of a grid pattern imprinted on the latex membrane. The overall stress-strain behavior is strongly dependent on the specimen density, confining pressure, sand grain texture, and the resulting failure mode(s). That became evident in different degrees of softening responses at various axial strains. The relationship between the constitutive behavior and the specimens' modes of instability is presented. The failure in all specimens was characterized by two distinct and opposite shear bands. It was found that the measured dilatancy angles increase as the sand grains' angularities and sizes increase. The measured shear band inclination angles are also presented and compared with classical Coulomb and Roscoe solutions.
Document ID
20000069798
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Alshibli, Khalid A.
(Alabama Univ. Huntsville, AL United States)
Sture, Stein
(Colorado Univ. Boulder, CO United States)
Date Acquired
August 19, 2013
Publication Date
June 1, 2000
Publication Information
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Publisher: American Society of Civil Engineers
Volume: 126
Issue: 6
ISSN: 1090-0241
Subject Category
Geophysics
Report/Patent Number
Paper-21167
Funding Number(s)
CONTRACT_GRANT: NAS8-38779
Distribution Limits
Public
Copyright
Other

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