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Geomechanics and Engineering Volume 7, Number 3, September 2014 , pages 279-295 DOI: https://doi.org/10.12989/gae.2014.7.3.279 |
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Time-dependent behaviour of interactive marine and terrestrial deposit clay |
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Xiaoping Chen, Qingzi Luo and Qiujuan Zhou
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| Abstract | ||
| A series of one-dimensional consolidation tests and triaxial creep tests were performed on Nansha clays, which are interactive marine and terrestrial deposits, to investigate their time-dependent behaviour. Based on experimental observations of oedometer tests, normally consolidated soils exhibit larger secondary compression than overconsolidated soils; the secondary consolidation coefficient (Cα) generally gets the maximum value as load approaches the preconsolidation pressure. The postsurcharge secondary consolidation coefficient (Cα') is significantly less than Cα. The observed secondary compression behaviour is consistent with the Cα/Cc concept, regardless of surcharging. The Cα/Cc ratio is a constant that is applicable to the recompression and compression ranges. Compared with the stage-loading test, the single-loading oedometer test can evaluate the entire process of secondary compression; Cα varies significantly with time and is larger than the Cα obtained from the stage-loading test. Based on experimental observations of triaxial creep tests, the creep for the drained state differs from the creep for the undrained state. The behaviour can be predicted by a characteristic relationship among axial strain rate, deviator stress level and time. | ||
| Key Words | ||
| secondary consolidation coefficient; creep; time-dependent; interactive marine and terrestrial deposit clay; laboratory | ||
| Address | ||
| (1) Xiaoping Chen, Qingzi Luo: MOE Key Laboratory of Disaster Forecast and Control in Engineering, College of Science and Engineering, Jinan University, Guangzhou, 510632, PR China; (2) Qiujuan Zhou: Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou, 510635, PR China. | ||