土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (6): 772-776.

• 测试技术 • 上一篇    下一篇

软土粘滞系数的测量方法及影响因素研究

刘 羊1，孙 茜2，王晓文3   

  1. (1.广州市城市规划勘测设计研究院，广州 510060；2.南京理工大学紫金学院,南京 210023；3.镇江市住房和城乡建设局，江苏镇江 212003)
  • 收稿日期:2020-07-24 修回日期:2020-08-04 出版日期:2021-12-30 发布日期:2021-12-24
  • 作者简介:刘 羊(1993-)，男，硕士研究生，助理工程师，研究方向为岩土工程。
  • 基金资助:
    江苏省高等学校自然科学研究面上项目（18KJB170006）

Study of Testing Method and Influence Factors of Viscosity Coefficient of Soft Soil

LIU Yang1, SUN Qian2， WANG Xiaowen3   

  1. (1.Guangzhou Urban Planning Survey & Design Institute, Guangzhou 510060；
    2.Zijin College, Nanjing University of Science & Technology, Nanjing 210023；
    3.Zhenjiang Housing and Urban Rural Development Bureau, Zhenjiang 212003)
  • Received:2020-07-24 Revised:2020-08-04 Online:2021-12-30 Published:2021-12-24

摘要： 粘滞系数是软土一个十分重要的物理力学指标，准确确定软土粘滞系数对于描述软土的蠕变和流变特性以及建立相应的本构模型有着十分重要的作用。鉴于前人确定粘滞系数的方法有着一定的局限性或争议，根据粘滞系数的定义提出一种利用应变控制式直剪仪测量粘滞系数的新方法，并依据此法研究剪切位移、竖向应力、含水量及固结对于软土粘滞系数的影响。试验结果表明，软土的粘滞系数随着剪切位移的增大而增大，并呈现对数相关关系；随着竖向应力的增大而逐渐增大，并呈现线性相关关系；随着含水量的增大而逐渐减小；固结会使软土粘滞系数增大。

关键词: 软土, 粘滞系数, 直剪试验, 含水量, 竖向应力, 剪切位移, 固结

Abstract: Viscosity coefficient is a very important physical and mechanical index of soft soils. The accurate determination of the viscosity coefficient of the soft soil plays an important role in describing the creep and rheological properties of the soft soil and establishing the corresponding constitutive model. The previous methods had either limitations or disputes on their applicability, therefore, a new method to determine the viscosity coefficient is proposed by using the direct shear test according to the definition of viscosity coefficient, and the study on the influence of the shear displacement, vertical stress, consolidation, and the moisture content for the viscosity coefficient of the soft soil was investigated. The results show that the viscosity coefficient of the soft soil increases with the increase of the shear displacement and presents a logarithmic correlation; increases with the increase of the vertical stress, and presents a linear correlation; and decreases with the increase of moisture content, consolidation makes the viscosity coefficient of the soft soil larger.

Key words: soft soil, viscosity coefficient, direct shear test, moisture content, vertical stress, shear displacement, consolidation

中图分类号: