马永明,郭聚坤,王瑞,左珅,李晋,魏道凯

• 1:山东交通学院交通土建工程学院
• 2:山东交通职业学院公路与建筑系
• 3:长安大学公路学院
• 4:宁夏大学土木与水利工程学院

摘要(Abstract)：

【目的】粗糙度和粒径是影响砂土地基桩侧摩阻力的关键因素，探究其对界面宏观力学特性和细观剪切机理的影响具有重要意义。【方法】利用改进的直剪设备，研究了考虑结构物表面纹理宽度与颗粒粒径影响的钢-砂界面宏观剪切性状和内在变化机理，借助PFC软件研究了界面细观行为演化规律。【结果】结果表明：细砂和中砂粒组的界面峰值剪切应力随纹理宽度增大而增加，粗砂粒组则呈现先增加后减小的变化规律；在纹理宽度与砂粒径的不同相对尺寸关系下，界面剪切机理与砂-砂剪切、颗粒-纹理嵌锁作用及纹理棱角阻碍作用密切相关；光滑界面的摩擦角随粒径增大而减小，粗糙界面的摩擦角基本与粒径成正比例关系；配位数和受界面剪切影响的颗粒范围随粒径的增大而增加，粒径较大的砂颗粒在试验中后期的界面处出现力链断裂现象。【结论】纹理的设计能够显著提升界面抗剪强度，具有粗糙纹理的桩表面更有利于中、粗砂地基桩基承载力的发挥。

关键词(KeyWords)： 钢;砂;粒径;纹理;剪切机理;细观行为;力学性能;变形

Abstract:

Keywords:

基金项目(Foundation): 山东省自然科学基金青年项目(ZR2020QE257);; 山东省交通运输科技项目(2020B23);; 山东交通学院研究生科技创新项目(2022YK022);; 国家自然科学基金项目(41572275)

作者(Author): 马永明,郭聚坤,王瑞,左珅,李晋,魏道凯

DOI: 10.13928/j.cnki.wrahe.2024.07.016

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