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Geomechanics and Engineering Volume 18, Number 3, June30 2019 , pages 299-313 DOI: https://doi.org/10.12989/gae.2019.18.3.299 |
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One-dimensional nonlinear consolidation behavior of structured soft clay under time-dependent loading |
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Weizheng Liu, Zhiguo Shi, Junhui Zhang and Dingwen Zhang
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| Abstract | ||
| This research investigated the nonlinear compressibility, permeability, the yielding due to structural degradation and their effects on consolidation behavior of structured soft soils. Based on oedometer and hydraulic conductivity test results of natural and reconstituted soft clays, linear log (1+e) ~ log sigma\'v and log (1+e) ~ log kv relationships were developed to capture the variations in compressibility and permeability, and the yield stress ratio (YSR) was introduced to characterize the soil structure of natural soft clay. Semi-analytical solutions for one-dimensional consolidation of soft clay under time-dependent loading incorporating the effects of soil nonlinearity and soil structure were proposed. The semi-analytical solutions were verified against field measurements of a well-documented test embankment and they can give better accuracy in prediction of excess pore pressure compared to the predictions using the existing analytical solutions. Additionally, parametric studies were conducted to analyze the effects of YSR, compression index (lambda_r and lambda_c), and permeability index (eta_k) on the consolidation behavior of structured soft clays. The magnitude of the difference between degree of consolidation based on excess pore pressure (Up) and that based on strain (Us) depends on YSR. The parameter lamda_c/eta_k plays a significant role in predicting consolidation behavior. | ||
| Key Words | ||
| nonlinear consolidation; soil structure; semi-analytical solutions; time-dependent loading | ||
| Address | ||
| Weizheng Liu and Zhiguo Shi: School of Civil Engineering, Central South University, Changsha, China Junhui Zhang:National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha, China Dingwen Zhang: School of Transportation, Southeast University, Nanjing, China | ||