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Title: Comparison of strain-rate dependent stress-strain behavior from Ko-consolidated compression and extension tests on natural Hong Kong Marine deposits
Authors: Yin, JH 
Cheng, CM
Keywords: Ko-consolidation
Marine deposits
Shear banding
Strain-rate effects
Triaxial compression
Triaxial extension
Issue Date: 2006
Publisher: Taylor & Francis
Source: Marine georesources & geotechnology, 2006, v. 24, no. 2, p. 119-147 How to cite?
Journal: Marine georesources & geotechnology 
Abstract: This article presents results from a series of Ko-consolidated compression and extension triaxial tests on specimens from undisturbed samples of Hong Kong Marine Deposits (HKMD). To investigate the strain-rate effects, a total of seven Ko-consolidated triaxial tests were conducted including four compression tests and three extension tests. After Ko-consolidation, the triaxial test specimens were sheared at step-changed axial strain rates under three different confining pressures of 50 kPa, 150 kPa, and 400 kPa, respectively. The step-changed strain rates were applied in the following order: +2%/h, +0.2%/h, +20%/h, -2%/h (unloading) and +2%/h (reloading) for the four compression tests and -2%/h, -0.2%/h, -20%/h, +2%/h (unloading) and -2%/h (reloading) for the three extension tests. The results are reported and analyzed in the paper. The results show that the strain rate effects, the stress-strain characteristics, and the effective stress paths of the specimens for tests in a compression state are different from those for tests in an extension stage. One order of magnitude increase in axial strain rate causes an average 8.6% increase in undrained shear strength for compression tests and a 12.1% increase for extension tests. It is also found that the failure mode of the specimens in compression is different from that in extension. The stress-strain behavior of specimens shows strain-softening and a clear shear band in compression tests, but strain-hardening without any clear shear band in extension tests for the same absolute value of axial strain.
ISSN: 1064-119X
EISSN: 1521-0618
DOI: 10.1080/10641190600704780
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