Investigation of diatomaceous sand using elastic and electromagnetic waves in oedometer tests
Investigation of diatomaceous sand using elastic and electromagnetic waves in oedometer tests
The small-strain and electromagnetic behaviours of soils significantly change due to compression. The objective of the present study is to investigate the small-strain stiffness and electrical resistivity of diatomaceous sand by modifying the conventional setup of oedometer tests (1D-compression tests). The specimens used are mixtures of sand and 0% and 20% diatom by weight. The vertical displacement is directly observed by a digital gauge at the top of the compression cap during compression. At the end of every loading step, shear waves (S-waves) are measured via a pair of bender elements installed in top and bottom compression caps. In addition, the electrical resistance is measured via a pair of electrodes installed horizontally at the middle of the compression cylinder. The test results show that the S-wave velocity increases exponentially to compression loads but decreases due to the presence of diatom. In addition, the electrical resistivity increases with the decrease in void ratios and decreases due to diatom added. The present study suggests that S-wave velocity and electrical resistivity of diatomaceous sand can be characterized by modifying conventional oedometer tests.
Ngoc Quy Hoang; Sang Yeob Kim; Dongsoo Lee; J. S. Lee
8th International Symposium on Deformation Characteristics of Geomaterials (ISDCG2023)
I.1) Advances in laboratory testing techniques (equipment and procedures)
Laboratory Testing
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