科研之友
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摘要
A practical use of the isotache concept in creep settlement prediction is newly introduced in this study. The isotache concept introduces a unique relationship between the strain and the consolidation pressure corresponding to the strain rate in association with viscosity. The authors have proposed a method to simply introduce the isotache concept, which uses a compression curve normalized by preconsolidation pressure [epsilon-log(sigma'/sigma(p)')] and a strain rate dependency relationship between the preconsolidation pressure (sigma(p)') and strain rate ((epsilon) over dot = d epsilon/dt). The strain rate dependency relationship is modeled as an equation based on power law. According to the authors' method, the slope of the strain rate dependency relationship (log sigma(p)'-log epsilon(over dot)), which coincides with C-alpha e/C-c, can be calculated as a function of strain rate, showing that C-alpha e/C-c is not constant but decreases with decreasing strain rate. In engineering practice, consolidation settlement is generally estimated based on the compression curve obtained from the 24-h incremental loading oedometer test, which corresponds to a strain rate of about 1x10(-7) s(-1). Using the compression index C-c at the consolidation pressure and initial void ratio e(0), creep settlement can be easily calculated as a function of C-c = (1+e(0)) and in situ strain rate (several orders of magnitude smaller than 1x10(-7) s(-1)). This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/.
- 出版日期2015-10
