长江科学院院报 ›› 2020, Vol. 37 ›› Issue (2): 119-125.DOI: 10.11988/ckyyb.20181066

• 岩土工程 • 上一篇    下一篇

滨海软土黏滞系数非线性特性及其表达

刘素梅1, 胡慧莹1, 李春光2, 王力1   

  1. 1.武汉大学 土木建筑工程学院,武汉 430072;
    2.中国科学院 武汉岩土力学研究所,武汉 430071
  • 收稿日期:2018-10-08 出版日期:2020-02-01 发布日期:2020-04-09
  • 通讯作者: 胡慧莹(1994-),女,黑龙江佳木斯人,硕士研究生,主要从事纤维混凝土耐久性及软土流变研究。E-mail:13080664364@163.com
  • 作者简介:刘素梅(1972-),女,湖北汉川人,副教授,博士,主要从事纤维混凝土耐久性、结构工程抗震、软土力学性能研究。E-mail:liusumei_2002@yahoo.com
  • 基金资助:
    中央高校专项基金(2042016kf1121)

Nonlinear Characteristics and Expression of Viscosity Coefficient of Coastal Soft Clay

LIU Su-mei1, HU Hui-ying1, LI Chun-guang2, WANG Li1   

  1. 1.School of Civil Engineering, Wuhan University, Wuhan 430072, China;
    2.Institute of Rock andSoil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2018-10-08 Online:2020-02-01 Published:2020-04-09

摘要: 通过对滨海软土三轴蠕变相关试验数据进行分析,发现黏滞系数不仅与时间有关,还与土所受到的偏压和围压有关。应变率与时间的关系呈现了非常明显的双对数线性关系,因此,黏滞系数是关于时间的幂函数;黏滞系数线性地依赖于偏压的变化,而与围压呈指数关系。最后建立了黏滞系数与时间、偏应力、围压之间的非线性关系表达式,并探讨了其相关参数的意义及取值范围。建立的黏滞系数表达式适用于描述非线性特征明显、应力水平较高的软土黏滞系数随时间、应力的变化规律,可推广到滨海软土直剪蠕变试验中。研究成果可为建立变黏滞系数的滨海软土及其他地区软土的非线性流变模型奠定基础。

关键词: 滨海软土, 黏滞系数, 三轴蠕变, 直剪蠕变, 非线性流变模型

Abstract: Analysis on triaxial creep test data of coastal soft soil reveals that viscosity coefficient is not only related to time, but also to the deviatoric pressure and confining pressure of soil. The relation between strain rate and time is of perfect double logarithmic linear characteristics. Hence, viscosity coefficient is a power function of time. Sensitivity analysis of deviatoric pressure unveils that viscosity coefficient is linearly dependent on deviatoric pressure and exponentially on confining pressure. Last but not the least, the nonlinear relations between viscosity coefficient with time, deviatoric stress and confining pressure are established and applied to the direct shear creep test of coastal soft soil. The proposed expression is applicable to describe the variation of viscosity coefficient of soft soil with apparent nonlinear characteristics and high stress level along with time and stress. In addition, factors affecting the relevant parameters are also put forward. The research findings lay a foundation for building the nonlinear rheological model coastal soft soil

Key words: coastal soft clay, viscosity coefficient, triaxial creep, direct shear creep, nonlinear rheological model

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