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Calibrating a T-bar factor for calcareous silt subjected to simple shear

conference contribution
posted on 12.10.2020, 00:00 by MA Mohiuddin, MS Hossain, Shah Neyamat Ullah, Y Kim, Y Hu
Field tests suggest that the T-bar factor may vary over a large range for calcareous soils. As the T-bar penetrates very deep into soft soil, a full flow-round mechanism is formed around the T-bar. Examining the stress states around this mechanism suggests that soil elements are subjected to a varying stress state, and the element behaviour represents a combination of triaxial compression, simple shear, and triaxial extension conditions. This paper reports results of T-bar penetrometer tests performed at an elevated gravity of 150-g (where g is earth’s gravity) in a geotechnical centrifuge on a calcareous silty sediment collected from the North West Shelf of Australia. Once the centrifuge tests were completed, a tube sample was cored from the centrifuge strongbox. Two specimens were prepared from two reference depths, and undrained monotonic simple shear tests were carried out. The undrained shear strengths obtained from the simple shear tests were used to back analyse the T-bar bearing factor (NT-bar). A mean T-bar factor of 9.92 was found for the calcareous silt tested. A threedimensional large deformation finite element analysis was conducted to find out the T-bar factor in an ideal soil, showing the potential for undertaking further parametric analyses using an appropriate constitutive model to develop a robust interpretation framework for Tbar test data.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Start Page

1651

End Page

1657

Number of Pages

7

Start Date

11/10/2020

Finish Date

16/10/2020

eISSN

1098-6189

ISBN-13

9781880653845

Location

Online

Publisher

International Society of Offshore and Polar Engineers (ISOPE)

Place of Publication

Online

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Western Australia

Era Eligible

Yes

Name of Conference

30th International Society of Offshore and Polar Engineers (ISOPE 2020)

Exports

CQUniversity

Exports