Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters

Elena Peri, Søren Dam Nielsen, Benjaminn Nordahl Nielsen, Lars Bo Ibsen

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

The traditional way of designing foundations is based on a single representative strength and deformation parameters. Often the strength properties are derived from triaxial testing. A triaxial test using samples with slenderness ratio H/D = 1 and smooth ends is found to be more reliable by several studies in the literature. Despite of that, the majority of triaxial tests are conducted with the traditional H/D = 2 ratio and rough ends. There are consequences in choosing to use the set-up with H/D=1 and smooth ends or the traditional one. This paper shows that the settlements of a rigid footing can be up to six times higher when the design uses deformation properties of a triaxial test run with H/D = 1 and smooth ends. This is due to a much lower secant stiffness than the one resulting from test with H/D = 2. Depending on the interpretation and way of conducting the test, the bearing capacity of a strip footing calculated by using properties from the H/D = 2 ratio and rough ends set-up can be almost two times greater than the one returned by the set-up with H/D=1 and smooth ends.
OriginalsprogEngelsk
Titel7th International Symposium on Geotechnical Safety and Risk : ISGSR 2019
StatusAccepteret/In press - 2019

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Boundary conditions
Testing
Bearing capacity
Stiffness

Citer dette

Peri, E., Nielsen, S. D., Nielsen, B. N., & Ibsen, L. B. (Accepteret/In press). Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters. I 7th International Symposium on Geotechnical Safety and Risk: ISGSR 2019
Peri, Elena ; Nielsen, Søren Dam ; Nielsen, Benjaminn Nordahl ; Ibsen, Lars Bo. / Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters. 7th International Symposium on Geotechnical Safety and Risk: ISGSR 2019. 2019.
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abstract = "The traditional way of designing foundations is based on a single representative strength and deformation parameters. Often the strength properties are derived from triaxial testing. A triaxial test using samples with slenderness ratio H/D = 1 and smooth ends is found to be more reliable by several studies in the literature. Despite of that, the majority of triaxial tests are conducted with the traditional H/D = 2 ratio and rough ends. There are consequences in choosing to use the set-up with H/D=1 and smooth ends or the traditional one. This paper shows that the settlements of a rigid footing can be up to six times higher when the design uses deformation properties of a triaxial test run with H/D = 1 and smooth ends. This is due to a much lower secant stiffness than the one resulting from test with H/D = 2. Depending on the interpretation and way of conducting the test, the bearing capacity of a strip footing calculated by using properties from the H/D = 2 ratio and rough ends set-up can be almost two times greater than the one returned by the set-up with H/D=1 and smooth ends.",
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Peri, E, Nielsen, SD, Nielsen, BN & Ibsen, LB 2019, Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters. i 7th International Symposium on Geotechnical Safety and Risk: ISGSR 2019.

Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters. / Peri, Elena; Nielsen, Søren Dam; Nielsen, Benjaminn Nordahl; Ibsen, Lars Bo.

7th International Symposium on Geotechnical Safety and Risk: ISGSR 2019. 2019.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters

AU - Peri, Elena

AU - Nielsen, Søren Dam

AU - Nielsen, Benjaminn Nordahl

AU - Ibsen, Lars Bo

PY - 2019

Y1 - 2019

N2 - The traditional way of designing foundations is based on a single representative strength and deformation parameters. Often the strength properties are derived from triaxial testing. A triaxial test using samples with slenderness ratio H/D = 1 and smooth ends is found to be more reliable by several studies in the literature. Despite of that, the majority of triaxial tests are conducted with the traditional H/D = 2 ratio and rough ends. There are consequences in choosing to use the set-up with H/D=1 and smooth ends or the traditional one. This paper shows that the settlements of a rigid footing can be up to six times higher when the design uses deformation properties of a triaxial test run with H/D = 1 and smooth ends. This is due to a much lower secant stiffness than the one resulting from test with H/D = 2. Depending on the interpretation and way of conducting the test, the bearing capacity of a strip footing calculated by using properties from the H/D = 2 ratio and rough ends set-up can be almost two times greater than the one returned by the set-up with H/D=1 and smooth ends.

AB - The traditional way of designing foundations is based on a single representative strength and deformation parameters. Often the strength properties are derived from triaxial testing. A triaxial test using samples with slenderness ratio H/D = 1 and smooth ends is found to be more reliable by several studies in the literature. Despite of that, the majority of triaxial tests are conducted with the traditional H/D = 2 ratio and rough ends. There are consequences in choosing to use the set-up with H/D=1 and smooth ends or the traditional one. This paper shows that the settlements of a rigid footing can be up to six times higher when the design uses deformation properties of a triaxial test run with H/D = 1 and smooth ends. This is due to a much lower secant stiffness than the one resulting from test with H/D = 2. Depending on the interpretation and way of conducting the test, the bearing capacity of a strip footing calculated by using properties from the H/D = 2 ratio and rough ends set-up can be almost two times greater than the one returned by the set-up with H/D=1 and smooth ends.

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Peri E, Nielsen SD, Nielsen BN, Ibsen LB. Consequences of slenderness and boundary conditions in triaxial testing on the reliability of design parameters. I 7th International Symposium on Geotechnical Safety and Risk: ISGSR 2019. 2019