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Study on Triaxial Creep Test and Constitutive Model of Compacted Red Clay

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Abstract

To study the stability of fill roadbeds for railway-private sidings at the Anning refinery in southwest China, a series of triaxial creep tests of compacted red clay was carried out using an SLB-1 stress–strain controlled triaxial shear permeability tester. In this paper, under different confining pressures, stress levels and drainage conditions, the creep characteristics of the red clay compaction were studied. The results showed that the creep characteristics of compacted red clay were significantly affected by confining pressure, stress level and drainage conditions, and the compacted red clay showed the characteristic of creep attenuation. The stress–strain isochronal curves indicated obvious nonlinear characteristics, which formed a cluster of curves with the uniformization procedure, whereas under drainage conditions, the stress–strain isochronal curves presented a certain linear relationship. Moreover, according to the stress–strain curves, the long-term strength of the compacted red clay was 0.54–0.72 times the instantaneous strength. Furthermore, taking the triaxial creep test of the compacted red clay under a confining pressure of 300 kPa as an example, the data were analyzed, and a new empirical creep model was established. Compared with the Burgers model and the Singh–Mitchell model, the calculated curve of the new empirical creep model is in good agreement with the experimental curve. The new model, which has fewer parameters that are easier to get, has the advantage of a higher accuracy. The new empirical model can better reflect and predict the creep characteristics of compacted red clay in the filling roadbeds of the special railway line at the Anning factory refinery in southwest China.

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Acknowledgements

The authors gratefully acknowledge the funding support provided by the National Natural Science Foundation of China (Grant No. 51508489) and High-level Talent Gathering Project in Hunan Province (2019RS1059).

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Authors and Affiliations

  1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China

    Zhilin Long, Yuzhu Cheng, Guoyue Yang, Dong Yang & Yunlong Xu

  2. Jianke Architectural Design Institute of Guangdong Province Co., Ltd, Guangzhou, 510000, China

    Yunlong Xu

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  1. Zhilin Long
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  2. Yuzhu Cheng
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  3. Guoyue Yang
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  4. Dong Yang
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Correspondence to Guoyue Yang.

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Long, Z., Cheng, Y., Yang, G. et al. Study on Triaxial Creep Test and Constitutive Model of Compacted Red Clay. Int J Civ Eng 19, 517–531 (2021). https://doi.org/10.1007/s40999-020-00572-x

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  • DOI: https://doi.org/10.1007/s40999-020-00572-x

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