Geomechanics and Engineering

  • 제7권3호
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  • Pages.279-295
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  • 2014
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Time-dependent behaviour of interactive marine and terrestrial deposit clay

  • Chen, Xiaoping (MOE Key Laboratory of Disaster Forecast and Control in Engineering, College of Science and Engineering, Jinan University) ;
  • Luo, Qingzi (MOE Key Laboratory of Disaster Forecast and Control in Engineering, College of Science and Engineering, Jinan University) ;
  • Zhou, Qiujuan (Guangdong Technical College of Water Resources and Electric Engineering)
  • 투고 : 2013.09.24
  • 심사 : 2014.05.30
  • 발행 : 2014.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

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 ($C_{\alpha}$) generally gets the maximum value as load approaches the preconsolidation pressure. The postsurcharge secondary consolidation coefficient ($C_{\alpha}$') is significantly less than $C_{\alpha}$. The observed secondary compression behaviour is consistent with the $C_{\alpha}/C_c$ concept, regardless of surcharging. The $C_{\alpha}/C_c$ 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; $C_{\alpha}$ varies significantly with time and is larger than the $C_{\alpha}$ 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.

키워드

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