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Strain and pore pressure development on soft marine clay in triaxial tests with a large number of cycles

机译：大量循环的三轴试验中软质海洋粘土的应变和孔隙压力发展

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摘要

Soft marine clays may be subjected to tens of thousands of cyclic applications of waves or traffic loads over a long period of time. Therefore, its cyclic deformation behavior is one of the major concerns of geotechnical engineers. In this study, a series of high cycle (50,000 cycles) triaxial tests have been carried out on soft marine clay with various stress levels and different confining pressures to investigate the development of strain and pore water pressure. Some useful conclusions are obtained. Firstly, the development of resilient and permanent strain depends on the cyclic stress ratio (CSR) values. When CSR is small, the resilient strain nearly keeps at a constant value after 1000 cycles and the permanent strain increases slowly and almost linearly with increasing CSR. When CSR is large, the resilient strain increases even after 50,000 cycles and the permanent strain increases rapidly and exponentially with increasing CSR. Secondly, log (ε_p/N) and log N exhibit a nearly linear relationship after a certain number of cycles which is called the reference number of cycles. An empirical formula is established to predict the long-term permanent strain by making use of this relationship. Thirdly, the peak axial strain increases exponentially with the decrease of the distance between the effective stress path and the critical state line. A formula is proposed to characterize the relationship between the peak axial strain and the peak pore water pressure after 1000 cycles.
机译：软质海洋粘土可能会在很长一段时间内经受成千上万次波浪或交通荷载的循环施加。因此，其周期性变形行为是岩土工程师关注的主要问题之一。在这项研究中，已经对具有不同应力水平和不同围压的软质海洋黏土进行了一系列的高循环（50,000个循环）三轴试验，以研究应变和孔隙水压力的变化。得到一些有用的结论。首先，弹性应变和永久应变的发展取决于循环应力比（CSR）值。当CSR较小时，在1000次循环后，弹性应变几乎保持恒定值，并且永久应变随着CSR的增加而缓慢且几乎呈线性增加。当CSR大时，即使经过50,000次循环，弹性应变也会增加，并且永久应变会随着CSR的增加而迅速且呈指数增长。其次，log（ε_p/ N）和log N在一定数量的周期后呈现出近似线性的关系，这称为参考周期数。建立了经验公式，通过利用这种关系来预测长期永久应变。第三，峰值轴向应变随着有效应力路径和临界状态线之间距离的减小而呈指数增加。提出了一个公式来表征1000次循环后的峰值轴向应变和峰值孔隙水压力之间的关系。

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  • 来源
    《Ocean Engineering》 |2013年第1期|125-132|共8页
  • 作者

    Jun Wang; Lin Guo; Yuanqiang Cai; Changjie Xu; Chuan Gu;

  • 作者单位

    College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, PR China;

    College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, PR China;

    College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, PR China,Key Laboratory of Soft Soils and Ceoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310027, PR China;

    Key Laboratory of Soft Soils and Ceoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310027, PR China;

    College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cyclic loads; Triaxial tests; Marine clay; Cyclic strain; Cyclic pore pressure;

    机译：循环载荷;三轴测试;海洋黏土;循环应变循环孔隙压力;

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