Journal Published Online: 11 October 2017
Volume 40, Issue 6

Effects of Strain Rates on the Undrained Shear Strength of Kaolin



In recent times, interest in dynamically installed foundation systems for deep-sea construction has increased; however, these foundation systems are still under development and need quantification of various soil parameters with different perspectives. For the design of dynamically installed foundations, it is essential to assess the strain-rate effect on very soft soils. The T-bar has been widely used to characterize soft offshore sediments, such as silt and clay, and there is extensive existing literature on the interpretation of test results. Strain-rate dependence has not previously been fully examined for T-bar tests in very soft clay at very high rates of penetration. This paper examines this aspect using a physical model test. A 65-cm-thick kaolin clay bed was formed using vacuum consolidation. A T-bar was driven into the clay bed at rates that varied from 0.1 cm/s to 60 cm/s. The tests revealed that the resistance factor increased by 9 % for every 10-fold increase in the penetration rate for the material tested in this research.

Author Information

Nanda, S.
KIIT University, Bhubaneswar, Odisha, India
Sivakumar, V.
Queen’s University, Belfast, United Kingdom
Hoyer, P.
Queen’s University, Belfast, Belfast, United Kingdom
Bradshaw, A.
University of Rhode Island, Kingston, RI
Gavin, K. G.
Delft University of Technology, Delft, the Netherlands
Gerkus, H.
University of Texas at Austin, Austin, TX
Jalilvand, S.
University College Dublin, Belfield, Ireland
Gilbert, R. B.
University of Texas at Austin, Austin, TX
Doherty, P.
Gavin & Doherty Geosolutions, Ireland
Fanning, J.
Queen’s University, Belfast, Belfast, United Kingdom
Pages: 12
Price: $25.00
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Stock #: GTJ20160101
ISSN: 0149-6115
DOI: 10.1520/GTJ20160101