土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (6): 1074-1078.

• 测试技术 • 上一篇    下一篇

钢-低液限黏土界面剪切性状试验研究

徐俊杰1，郭聚坤1,2，王 瑞2，许有广1，刘贤良1，刘志强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:2022-12-13 修回日期:2023-03-13 出版日期:2024-12-31 发布日期:2024-12-20
  • 通讯作者: 郭聚坤（1986-），男，博士，副教授，研究方向为土体力学特性。
  • 作者简介:徐俊杰（2001-），男，本科，研究方向为黏土力学性质。
  • 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）；潍坊市高新区科技惠民计划项目 (No.2021KJHM29)

Experimental Study on Direct Shear Behaviors of Interface Between Steel and Low Liquid Limit Clay

XU Junjie1, GUO Jukun1,2, WANG Rui2, XU Youguang1, LIU Xianliang1， LIU Zhiqiang1   

  1. (1.Department of Highway and Architecture, Shandong Transportation Vocational College, Weifang 261206；
    2.School of Highway, Chang’an University, Xi’an 710064)
  • Received:2022-12-13 Revised:2023-03-13 Online:2024-12-31 Published:2024-12-20

摘要： 研究结构物-土体界面剪切性状对于基础工程设计、施工等具有重要意义。利用改进的直剪仪，考虑界面类型、土体含水率两个因素，进行了钢低液限黏土界面剪切试验，分析了剪切律、强度律及体变律等三种规律。结果表明： 剪切应力随剪切位移增加呈现“快速增长-慢速增长-保持稳定”三个阶段，且剪切应力～剪切位移关系可用Gompertz模型进行表达；土体处于最佳含水率时，界面抗剪强度及指标最大；粗糙界面的界面抗剪强度及指标比光滑界面大；粗糙界面下土体产生的剪缩特性比光滑界面更为明显；土体剪缩特性随含水率的增加表现的愈发显著。

关键词: 钢, 低液限黏土, 含水率, 粗糙度, 剪切律, 强度律, 体变律

Abstract: It is of great significance to study the shear behavior of the structure-soil interface for foundation engineering design and construction. With the improved direct shear apparatus, considering the interface type and the soil water content, the direct shear tests of interface between steel and low liquid limit clay were performed, and the rate of shear, stress strain relationship and the volume change were analyzed. The results show that the shear stress presents three stages; namely, fast increase, slow increase and maintain stability, with the shear displacement. The relationship between the shear stress and the shear displacement can be expressed by the Gompertz model. When the soil mass is at the optimum water content, the interface shear strength and the index are the largest. The shear strength and the index of the rough interface are larger than those of the smooth interface. The shear shrinkage of the soil under the rough interface is more obvious than that under the smooth interface. The shear shrinkage characteristics of the soil become more significant with the water content.

Key words: Steel, Low Liquid Limit Clay, Water Content, Roughness, Rate of Shear, Stress Strain Relationship, Volume Change

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