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Published in:
2018 | OriginalPaper | Chapter
Undrained Behavior of Macau Marine Clay with Various Strain Rates and Different Stress Histories
Authors : Shengshen Wu, Thomas Lok, Annan Zhou
Published in: Proceedings of the 4th Congrès International de Géotechnique - Ouvrages -Structures
Publisher: Springer Singapore
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Abstract
Hydro-mechanical behaviors of a saturated clay with various strain-rate and different stress histories are investigated through a series of consolidated-undrained and K0 consolidated undrained (K0CU) tests which were conducted on reconstituted specimens. The samples were taken from an excavation site in Macau and reconstituted in the laboratory to provide homogenous specimens. A total of four CU tests and four K0CU tests were undertaken on 38 mm diameter samples. The samples were saturated first by use back pressure saturation method (back pressure 200 kPa), after saturation, they were loaded to a confining stress 400 kPa and then unload to 50 kPa, 100 kPa, 200 kPa, 400 kPa (OCR = 8, 4, 2, 1) and finally were sheared at constant shear rate (0.1%/h, 1%/h, 10%/h) to failure. In this research the responses of marine clay under various strain rates under different OCRs on the strain-rate effects will be discussed, parameters for accounting the strain-rate effects on undrained shear strength will be proposed.