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Practical method and application study for predicting cyclic accumulative deformations of the saturated soft clay

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Abstract

The distribution of saturated soft clay is greatly wide in China. The current main measures adopted to deal with soft soil foundations may lead to environmental pollution, even some engineering accidents may happen on soft soil foundations. In order to solve engineering problems of saturated soft soil foundations well, researches of mechanical properties of them are necessary. One of the most important mechanical characteristics of saturated soft clay is its cyclic accumulative deformation under cyclic loadings. For saturated soft clay, the cyclic accumulative deformation is similar to the creep behavior under static loadings. Therefore, the cyclic accumulative deformation is equivalent to the creep, the number of loading cycles is seen as the time, and this study develops a practical method for predicting the cyclic accumulative deformation of saturated soft clay with the creep theory. The method is a pseudostatic elasto-plastic finite element method implemented by ABAQUS software. A fitted equation between cyclic accumulative strain and number of loading cycles and the empirical relationship of parameters of fitted equation were established with a series of cyclic triaxial compression tests. Then with this empirical relationship of parameters, the method developed by this study was employed to predict the cyclic accumulative deformation under cyclic triaxial tension tests. Predicted results were in good agreement with test results, and the effectiveness of this method was thus validated for different stress states. The method was then applied in analyzing the cyclic accumulative deformation for soft soil foundation of a pile-supported wharf structure.

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Acknowledgements

The research reported in this manuscript is funded by Science Commission Fund of Chongqing (Grant No.cstc2016jcyjA0123) and Open Fund of Key Laboratory of regulation technology for inland waterway in transportation industry of Chongqing Jiaotong University (Grant No. NHHD-201506).

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Authors and Affiliations

  1. Key Laboratory of Hydraulic and Waterway Engineering of Ministry of Education, Key Laboratory of regulation technology for inland waterway in transportation industry, Chongqing Jiaotong University, Chongqing, 400074, China

    Lin-lin He

  2. State Key Laboratory for Simulation & Safety of Hydraulic Engineering, Tianjin Key Laboratory of Harbor & Ocean Engineering, Tianjin University, Tianjin, 300072, China

    Lin-lin He & Yuan-zhan Wang

  3. CNOOC Research Institute, Beijing, 100028, China

    Shu-zhao Li & Zhao-yang Wang

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  1. Lin-lin He
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  2. Yuan-zhan Wang
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  3. Shu-zhao Li
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  4. Zhao-yang Wang
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Correspondence to Lin-lin He.

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He, Ll., Wang, Yz., Li, Sz. et al. Practical method and application study for predicting cyclic accumulative deformations of the saturated soft clay. J. Mt. Sci. 14, 2348–2358 (2017). https://doi.org/10.1007/s11629-016-3972-9

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  • DOI: https://doi.org/10.1007/s11629-016-3972-9

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