土工基础

土工基础 ›› 2023, Vol. 37 ›› Issue (3): 488-491.

• 测试技术 • 上一篇    下一篇

含水率和压缩时间对钢-黏土界面剪切特性的影响研究

刘贤良1，郭聚坤1,2，王瑞2，徐俊杰1，许有广1   

  1. （1.山东交通职业学院公路与建筑系，山东潍坊 261206；2.长安大学公路学院，西安 710064)
  • 收稿日期:2021-12-05 修回日期:2021-12-20 出版日期:2023-06-30 发布日期:2023-07-06
  • 通讯作者: 郭聚坤（1986-），男，博士，副教授，研究方向为砂土力学性质。
  • 作者简介:刘贤良（2001-），男，本科，研究方向为结构物-土体界面剪切特性。
  • 基金资助:
    山东省自然科学基金青年项目（No.ZR2020QE257）；山东省交通运输科技项目（No.2020B23）

Effects of Water Content and Compression Time on Shear Properties of Interface between Steel and Clay#br#

LIU Xianliang1, GUO Jukun1,2, WANG Rui2,  XU Junjie1， XU Youguang1   

  1. （1.Department of Highway and Architecture, Shandong Transport Vocational College, Weifang 261206；
    2.School of Highway, Chang’an University, Xi’an 710064）
  • Received:2021-12-05 Revised:2021-12-20 Online:2023-06-30 Published:2023-07-06

摘要： 研究结构物与土体界面剪切特性对桩基承载力及稳定性具有重要工程意义。采用改进的直剪仪，考虑土体含水率和压缩时间两种因素，进行了钢与低液限黏土间的界面剪切试验，分析了界面剪切应力-剪切位移关系和界面剪切强度指标。结果表明：界面剪切应力-剪切位移关系可用双曲线模型表示，试验峰值剪切应力和模型峰值剪切应力均随法向应力和压缩时间的增大而增加，随含水率的增大先增加后减小，破坏比Rf集中在0.851～0.960范围内，初始剪切刚度集中在19.96～131.58之间。黏聚力和界面摩擦角均随含水率的增大呈现出先增加后减小的趋势，在最佳含水率附近最大，界面黏聚力和界面摩擦角与压缩时间呈正比例关系。


关键词: 钢, 低液限黏土, 剪切应力, 含水率, 压缩时间, 抗剪强度指标

Abstract: It is of great engineering significance to study the shear characteristics of the interface between structure and soil for the axial capacity and stability of the piled foundation. In this paper, the interface shear tests between steel and low liquid limit clay are performed by using the improved direct shear instrument, considering the two factors of the soil water content and the compression time. The relationship between the shear stress and the shear displacement, the shear strength index is analyzed respectively. The results show that the relationship between the shear stress and the shear displacement of the interface can be expressed by a hyperbolic model. The test peak shear stress and the model peak shear stress increase with the normal stress and the compression time and increase first and then decrease with the water content. The failure ratio ranges from 0.851 to 0.960, and the initial shear stiffness range from 19.96 to 131.58. The cohesion and the friction angle of the interface increase first and then decrease with the water content and reach the maximum near the optimal water content. The cohesion and the friction angle of interface are positively proportional to the compression time.

Key words: Steel, Low Liquid Limit Clay, Shear Stress, Water Content, Compression Time, Shear Strength Index

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