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Implementation of image processing technique for measuring membrane penetration in triaxial testing on gravelly soils

Haeri, S. M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. Publisher: 19th ICSMGE Secretariat , 2017
  3. Abstract:
  4. The volume change that occurs due to membrane penetration into peripheral voids of gravelly specimens during hydrostatic compression test in a conventional triaxial apparatus is studied by performing a set of hydrostatic compression tests on gravelly specimens with different initial relative densities. During the isotropic loading on the specimens, the total volume changes of the specimens were determined by measuring the amount of water seeping out of the specimens at different loading steps. Image processing technique was implemented simultaneously to determine the skeletal volume changes of the specimens. In this regard specimens were compressed to isotopic pressures from 10 to 500 kPa following a step-loading mode. Images of the specimens were captured continuously at different confining pressures. The volumetric membrane penetration was then calculated for each specimen at each confining pressure. The normalized membrane penetration and the ratio of volumetric skeletal strains to axial strains were determined and compared for the tested specimens. The results indicate that an increase in relative density of the specimen leads to an increase in the ratio of volumetric skeletal strains to axial strains and a decrease in the normalized membrane penetration
  5. Keywords:
  6. Gravelly soil ; Membrane Compliance ; Compression testing ; Geotechnical engineering ; Hydraulics ; Membranes ; Rock pressure ; Soil liquefaction ; Soil mechanics ; Soil testing ; Soils ; Different confining pressures ; Gravelly soils ; Hydrostatic compression ; Image processing technique ; Isotropic consolidation ; Liquefaction resistance ; Membrane compliances ; Membrane penetration ; Image processing
  7. Source: 19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017, 17 September 2017 through 22 September 2017 ; 2017 , Pages 381-384
  8. URL: https://www.issmge.org/uploads/publications/1/45/06-technical-committee-01-tc101-23.pdf