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Interpreting T-bar tests in ultra-soft clay

This technical note describes a simple methodology for reliably measuring the undrained strength of ultra-soft consolidating clay in the geotechnical centrifuge, using the T-bar penetrometer. This methodology relies on the T-bar resistance force owing to soil strength being equal, albeit in the oppo...

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Main Authors: Sahdi, F., Gaudin, C., Boylan, N.
Format: E-Article
Published: ICE Publishing 2014
Subjects:
GE Environmental Sciences
Q Science (General)
Online Access:http://ir.unimas.my/id/eprint/1578/
http://www.icevirtuallibrary.com/content/article/10.1680/ijpmg.13.00012
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id my.unimas.ir.1578
record_format eprints
spelling my.unimas.ir.15782015-03-11T04:22:21Z http://ir.unimas.my/id/eprint/1578/ Interpreting T-bar tests in ultra-soft clay Sahdi, F. Gaudin, C. Boylan, N. GE Environmental Sciences Q Science (General) This technical note describes a simple methodology for reliably measuring the undrained strength of ultra-soft consolidating clay in the geotechnical centrifuge, using the T-bar penetrometer. This methodology relies on the T-bar resistance force owing to soil strength being equal, albeit in the opposite direction, during penetration and extraction when the soil is fully remoulded. The other components of resistance from soil buoyancy, bar self-weight and soil lateral pressure on the T-bar axial strain gauge act in the same direction regardless of the direction of bar movement. The method uses cycles of penetration and extraction to determine the correction required to eliminate these effects. The methodology was validated by comparing the strength inferred from 81 T-bar penetrometer tests with a large strain numerical simulation of consolidation and the resulting gain in soil strength. ICE Publishing 2014 E-Article NonPeerReviewed Sahdi, F. and Gaudin, C. and Boylan, N. (2014) Interpreting T-bar tests in ultra-soft clay. International Journal of Physical Modelling in Geotechnics, 14 (1). pp. 13-19. ISSN 2042-6550 http://www.icevirtuallibrary.com/content/article/10.1680/ijpmg.13.00012
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
topic GE Environmental Sciences
Q Science (General)
spellingShingle GE Environmental Sciences
Q Science (General)
Sahdi, F.
Gaudin, C.
Boylan, N.
Interpreting T-bar tests in ultra-soft clay
description This technical note describes a simple methodology for reliably measuring the undrained strength of ultra-soft consolidating clay in the geotechnical centrifuge, using the T-bar penetrometer. This methodology relies on the T-bar resistance force owing to soil strength being equal, albeit in the opposite direction, during penetration and extraction when the soil is fully remoulded. The other components of resistance from soil buoyancy, bar self-weight and soil lateral pressure on the T-bar axial strain gauge act in the same direction regardless of the direction of bar movement. The method uses cycles of penetration and extraction to determine the correction required to eliminate these effects. The methodology was validated by comparing the strength inferred from 81 T-bar penetrometer tests with a large strain numerical simulation of consolidation and the resulting gain in soil strength.
format E-Article
author Sahdi, F.
Gaudin, C.
Boylan, N.
author_facet Sahdi, F.
Gaudin, C.
Boylan, N.
author_sort Sahdi, F.
title Interpreting T-bar tests in ultra-soft clay
title_short Interpreting T-bar tests in ultra-soft clay
title_full Interpreting T-bar tests in ultra-soft clay
title_fullStr Interpreting T-bar tests in ultra-soft clay
title_full_unstemmed Interpreting T-bar tests in ultra-soft clay
title_sort interpreting t-bar tests in ultra-soft clay
publisher ICE Publishing
publishDate 2014
url http://ir.unimas.my/id/eprint/1578/
http://www.icevirtuallibrary.com/content/article/10.1680/ijpmg.13.00012
_version_ 1644508890911473664
score 13.211869

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