Advances in Computed Tomography for Geomaterials: GeoX 2010

Strain Field Measurements in Sand under Triaxial Compression Using X-ray CT Data and Digital Image Correlation

Y. Watanabe¹ — N. Lenoir² — S. A. Hall³ — J. Otani¹

¹X-Earth Center, Kumamoto University2-39-1, Kurokami, Kumamoto CityKumamoto 860-8550, [e-mail]

 

²Civil and Environmental EngineeringNorthwestern UniversityEvanston, IL, [e-mail]

 

³Laboratoire 3S-RCNRS/Grenoble UniversityGrenoble, [e-mail]

ABSTRACT. This paper presents the results of an experimental study on strain localization in soil. The purpose is to characterize in space and time the internal strains and strain localization patterning in a sand undergoing triaxial compression at different confinement pressures. In-situ triaxial tests were conducted on Yamazuna sand at the X-Earth Center (Japan) at different confinement pressures. Complete 3D images of the specimen were obtained at several loading stages throughout the test and analyzed by 3D-volumetric digital image correlation (3D-DIC) in order to obtain 3D incremental displacement and strain fields. Based on the results of XRCT (x-ray computed tomography)/3D-DIC combination, the deformation process and especially the strain localization are quantitatively characterized in space and time under triaxial compression conditions.

 

KEYWORDS: strain localization, sand, in-situ triaxial test, digital image correlation

1. Introduction

In geotechnical engineering, characterization of the deformation behavior ...