STUDY OF STRAIN LOCALIZATION AND MICROSTRUCTURAL CHANGES IN PARTIALLY SATURATED SAND DURING TRIAXIAL TESTS USING MICROFOCUS X-RAY CT

SOILS AND FOUNDATIONS

YOSUKE HIGO¹  FUSAO OKA¹  YOSHIKI MATSUSHIMA¹  TAISUKE SANAGAWA¹  SAYURI KIMOTO¹ 

[1] Department of Civil and Earth Resources Engineering, Kyoto University

关键词: microfocus X-ray CT;    microstructural changes;    partially saturated sand;    strain localization;    triaxial tests;    (IGC: D3/D6);   

DOI  :  10.3208/sandf.51.95

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(28)Cited-By(1)It is well known that strain localization and microstructural changes are important issues in the onset of failure problems. In particular, unsaturated soil exhibits more brittle failure due to the collapse of the water meniscus, caused by shearing or the infiltration of water, than saturated soil. The aim of this paper is to observe the strain localization behavior and the microstructural changes in partially saturated soil during the deformation process using microfocus X-ray CT. The microfocus X-ray CT system employed in this study has a very high spatial resolution of 5 μm, which is enough to visualize the sand particles and the other particles individually. In addition, X-ray CT scans can be performed under triaxial conditions. The strain localization of fully saturated, partially saturated, and air-dried sand specimens during triaxial compression tests is observed and discussed. The microstructure of unsaturated soil, consisting of soil particles, pore water, and pore air, is successfully observed in partial CT scans. Through a comparison of the microstructures in the shear bands and in the initial state, the microstructural changes are discussed.

【 授权许可】

Unknown