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Volume 36 Issue 6
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LI Guo-wei, ZHOU Yang, RUAN Yu-sheng, HUANG Kai, YIN Jian-hua. Plane strain tests on creep characteristics of over-consolidated clay[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(6): 1028-1035. DOI: 10.11779/CJGE201406006
Citation: LI Guo-wei, ZHOU Yang, RUAN Yu-sheng, HUANG Kai, YIN Jian-hua. Plane strain tests on creep characteristics of over-consolidated clay[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(6): 1028-1035. DOI: 10.11779/CJGE201406006
shu

Plane strain tests on creep characteristics of over-consolidated clay

  • 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Highway and Railway Research Institute, Hohai University, Nanjing 210098; 3. Geotechnical Research Institute, Hohai University, Nanjing 210098; 4. Hongkong Polytechnic University, H K, China

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  • Received Date: October 11, 2013
  • Published Date: June 19, 2014
    Graphical Abstract
    • Abstract
  • It is more realistic that the clay unit cell of road embankment is in the state of plane strain. The creep characteristics of over-consolidated soils are studied through plane strain tests for the undisturbed soft clay. Four creep tests are carried out by using the plane strain creep apparatus, one is conducted on normally consolidated clay and three are on over-consolidated clay. The studies show that for the normally consolidated soils, the volumetric strain of creep in plane strain tests varies in the same way with the secondary consolidation under one-dimension condition, and that the clay presents less axial strain in plane strain tests than that in one-dimension tests when the principal stress ratio equals the ratio in K0 state. The definition of plane strain over-consolidation ratio (OCRp) is given, and it is used to describe the characteristics of over-consolidated soils. It is found that it is reasonable to determine the volumetric creep coefficient as well as axial creep coefficient directly by using OCRp. Compared with normally consolidated clay, under plane strain state, the over-consolidated clay has a lager Poisson's ratio and larger principal stress in the direction of limited deformation.
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