Development of vertical and horizontal disk transducers for wave velocity measurements in a large rectangular specimen

Troyee Dutta, Masahide Otsubo, Reiko Kuwano, Takeshi Sato

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

For the accurate design of structures subjected to both static and dynamic loadings, elastic wave velocity and small strain stiffness are essential parameters. Numerous techniques have been developed to estimate wave velocities of geomaterials. Bender elements which are widely adopted for wave velocity measurements are invasive in nature and are not suitable for coarse-grained materials. In the present study, new design configuration of disk transducer has been introduced to measure both vertical and horizontal wave velocities for coarse granular soils considering multidirectional oscillation of propagating waves. An innovative arrangement of both compression and shear type elements has been installed in a large-sized triaxial apparatus having rectangular specimens of size 236×236×500 mm to assess the wave velocities. The materials described are Toyoura sand (D50 = 0.24 mm) and Oiso gravel (D50 = 11.8 mm). This arrangement enables measurements of nine types of wave velocities, and thus the stiffness anisotropy to be quantified. For Oiso gravel, horizontal wave velocities are greater than vertical wave velocities for both shear and compression waves. For Toyoura sand, shear wave velocities are higher in horizontal direction of propagation, whereas similar compression wave velocities are observed from both horizontal and vertical directions.
Original languageEnglish
Title of host publication7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019
EditorsErdin Ibraim, Alessandro Tarantino
PublisherEDP Sciences
Number of pages6
ISBN (Electronic)9782759890644
DOIs
Publication statusPublished - 2019
Externally publishedYes
EventInternational Symposium on Deformation Characteristics of Geomaterials 2019 - Glasgow, United Kingdom
Duration: 26 Jun 201928 Jun 2019
Conference number: 7th

Publication series

NameE3S Web of Conferences
Volume92
ISSN (Print)2555-0403
ISSN (Electronic)2267-1242

Conference

ConferenceInternational Symposium on Deformation Characteristics of Geomaterials 2019
Abbreviated titleIS-Glasgow 2019
CountryUnited Kingdom
CityGlasgow
Period26/06/1928/06/19

Cite this