土工基础

›› 2018, Vol. 32 ›› Issue (6): 629-632.

• 工程实录 • 上一篇    下一篇

考虑结构性软粘土的流变特性研究及工程应用

  

  1. （1.安徽理工大学，安徽淮南 232001；2.浙江大学城市学院，杭州 310020；
    3.浙江省水利河口研究院，杭州 100142）
  • 收稿日期:2018-02-05 修回日期:2018-03-11 出版日期:2018-12-20 发布日期:2018-12-21
  • 通讯作者: 唐 杰（1995-），男，硕士研究生，研究方向为岩土工程。
  • 作者简介:魏新江（1965-），男，教授，博士，博士生导师，研究方向为岩土工程。
  • 基金资助:

    国家自然科学基金项目(51408549)，浙江省自然科学基金(LY16E090005，LY18E080024)

A Soft Clay Constitutive Model Considering Rheological and Structural Properties and Its Engineering Applications

  1. (1.Anhui University of Science and Technology, Huainan, 232001；2.City College, Zhejiang University, Hangzhou, 310020；
    3.Zhejiang Institute of Hydraulics and Estuary, Hangzhou, 100142)
  • Received:2018-02-05 Revised:2018-03-11 Online:2018-12-20 Published:2018-12-21

摘要： 在边界面弹塑性理论的基础上，将修正剑桥模型屈服面作为边界面，引入形状参数以控制椭圆屈服面横轴的长度，通过引入结构性参数用以计算结构性损伤应变，提出一种考虑软粘土结构性和流变特性的边界面本构模型。通过室内一维压缩和三轴流变试验来获取模型的基本参数，计算温州某海堤工程的现场堆载预压的地表长期沉降值。将模型计算值与现场实测值进行对比，结果表明该模型比传统不考虑软土结构性和流变特性的边界面模型，更能真实的反映天然结构软粘土的长期变形特性。

关键词: 本构模型, 温州软粘土, 结构性, 流变特性, 堆载预压, 地表沉降值

Abstract: A soft clay constitutive model is developed based on the elastoplasticity theory and using modified CamClay model as the boundary surface. In the model, a shape factor is introduced to define the horizontal axis length of the ellipse yield surface, at the time a structural parameter is used to describe the structural damage strain. The parameters can be calibrated by conducting the laboratory one dimensional consolidation and triaxial rheological tests. This model was used to estimate the longterm settlement of a sea levee improved by surcharging method. The results indicate that the new constitutive model has the advantage of describe the behavior of the structural soft clays, compared with the conventional soft clay models.

Key words: Constitutive Model, Wenzhou Soft Clay, Structural Property, Rheological Property, Surcharge Preloading, Ground Surface Settlement Value