Analysis of simple shear tests with cell pressure confinement

J. Antonio Harb Carraro

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The high cost of offshore infrastructure provides continuous encouragement for optimisation of design practices. Development of a more rational method to interpret results from simple shear tests with cell pressure confinement can reduce costs and improve reliability of offshore infrastructure. This paper addresses a commonly overlooked issue affecting design parameter selection: specimen shape varies from right cylinder to oblique cylinder after loading along a single shearing direction. Thus, horizontal stresses are not always equal to the cell pressure and their magnitude varies throughout the specimen’s lateral surface. An analysis is proposed that accounts for changing specimen geometry and lateral surface area during shearing and for the actual effect of cell pressure during testing. The analysis also describes how the intermediate principal stress can be assessed. Test results for medium dense silica sand are interpreted following de Josselin de Jong’s alternative shearing mechanism hypothesis. Conventional interpretation methods yield conservative design parameters for this soil. Failure states develop when the intermediate principal effective stress is halfway between major and minor principal effective stresses. Typical results for the soil tested show equipment performance meets standard direct simple shear requirements for shear strain rate, vertical stress and specimen height control.

Original languageEnglish
Pages (from-to)169-180
Number of pages12
JournalGeomechanics and Geoengineering
Volume12
Issue number3
DOIs
Publication statusPublished - 3 Jul 2017

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shear test
effective stress
Shearing
infrastructure
shear strain
strain rate
cost
Soils
Silica sand
soil
surface area
silica
Shear strain
geometry
sand
Costs
Strain rate
analysis
Geometry
Testing

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Harb Carraro, J. Antonio. / Analysis of simple shear tests with cell pressure confinement. In: Geomechanics and Geoengineering. 2017 ; Vol. 12, No. 3. pp. 169-180.
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Analysis of simple shear tests with cell pressure confinement. / Harb Carraro, J. Antonio.

In: Geomechanics and Geoengineering, Vol. 12, No. 3, 03.07.2017, p. 169-180.

Research output: Contribution to journalArticle

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