Spatial variation of void ratio and shear band thickness in sand using X-ray computed tomography
- LSU
A detailed study of spatial variation of void ratio and shear band thickness measurements is presented in this paper. A prismatic sand specimen that initially measured 57{center_dot}4 mm wide x 120{center_dot}5 mm long x 182{center_dot}1 mm high was sheared under plane-strain (biaxial) loading conditions. The specimen was prepared at a relative density of 79% using F-75 Ottawa sand. X-ray computed tomography was used to scan the specimen before shearing and after the onset of the shear band. The specimen failed through a single shear band with an inclination angle of 65{center_dot}6{sup o} measured from the direction of the minor principal stress. Computer algorithms were developed to calibrate CT images and quantify void ratio (e) variation within the specimen. CT data analysis revealed cross-sectional spatial variation in void ratio where density is higher in regions close to the edges of the specimen due to membrane effects and confining pressure with no significant variation in void ratio in the axial direction (top to bottom) before shearing. The shear band was easily identified from the CT images, and analysis of void ratio showed a noticeable jump in void ratio profile across the shear band. A detailed statistical summary of the thickness of the shear band and variation of void ratio across the shear band is presented and discussed.
- Research Organization:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1006591
- Journal Information:
- Geotechnique, Journal Name: Geotechnique Journal Issue: (4) ; 04, 2008 Vol. 58; ISSN 0016-8505; ISSN GTNQA8
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Three dimensional fabric evolution of sheared sand
Discrepancy in the Critical State Void Ratio of Poorly Graded Sand due to Shear Strain Localization
Elastic properties of unconsolidated porous sand reservoirs
Journal Article
·
Wed Oct 24 00:00:00 EDT 2012
· Granul. Matter
·
OSTI ID:1046858
Discrepancy in the Critical State Void Ratio of Poorly Graded Sand due to Shear Strain Localization
Journal Article
·
Fri Jul 31 20:00:00 EDT 2020
· Journal of Geotechnical and Geoenvironmental Engineering
·
OSTI ID:1681196
Elastic properties of unconsolidated porous sand reservoirs
Journal Article
·
Wed Nov 30 23:00:00 EST 1977
· Geophysics; (United States)
·
OSTI ID:5615029