Geomechanics and Engineering

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Interpretation of coefficient of consolidation from CRS test results

  • Jia, Rui (Institute of Lowland and Marine Research, Saga University) ;
  • Chai, Jinchun (Department of Civil Engineering and Architecture, Saga University) ;
  • Hino, Takenori (Institute of Lowland and Marine Research, Saga University)
  • Received : 2012.04.24
  • Accepted : 2012.10.27
  • Published : 2013.02.25
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Abstract

Constant rate of strain (CRS) consolidation tests were conducted for undisturbed Ariake clay samples from three boreholes in Saga Plain of Kyushu Island, Japan. The coefficients of consolidation ($c_{\nu}$) were interpreted from the CRS test results by small- and large-strain theory. Large-strain theory was found to interpret smaller $c_{\nu}$ values and less strain rate effect on $c_{\nu}$ than that by small-strain theory. Comparing the theoretical strain distributions within a soil specimen to those obtained by numerical simulation shows that the small-strain theory can be used only for the dimensionless parameter $c_{\nu}/\dot{\varepsilon}H_0^2{\geq}50$ (where $\dot{\varepsilon}$ is strain rate and $H_0$ is the specimen height), and the large-strain theory can be used for a larger range of strain rates. Applying the criterion to undisturbed Ariake clay with a $c_{\nu}$ value of about $1{\times}10^{-7}\;m^2/s$, it is suggested that the large-strain theory should be adopted for calculating the $c_{\nu}$ value when $\dot{\varepsilon}$ > 0.03%/min.

Keywords

References

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