抗浮锚杆锚固界面渐进性破坏失效细观力学模型
The Micro-mechanical Mode for Progressive Failure at the Anchoring Interface of the Anti-floating Bolt
张志刚 1李娟 2乔建刚 3李景文3
作者信息
- 1. 河北省高速公路延崇筹建处,张家口 075400
- 2. 沧州交通学院土木建筑工程学院,黄骅 061199
- 3. 河北工业大学土木与交通学院,天津 300401
- 折叠
摘要
为了从微观上获得抗浮锚杆锚固界面渐进性破坏失效机理,提高抗浮锚杆的承载能力,基于微凸体侧接触理论,分析了锚固界面的细观力学机理,揭示了微凸体在弹性阶段、弹塑性阶段和塑性阶段,其法向分力、切向分力分别与变形之间的变化规律,从细观层面上建立了抗浮锚杆的抗拔承载力力学模型.结果表明:在弹性、弹塑性阶段,无量纲法向分力和切向分力随Z方向上的无量纲变形量呈非线性变化,而在塑性阶段近似呈线性变化;在相同的无量纲变形量下,无量纲法向分力和切向分力与接触角度有关系.利用微凸体接触力学,进行仿真模拟分析,为研究抗浮锚杆锚固界面渐进性破坏失效提供了一种思路.
Abstract
In order to obtain the progressive failure mechanism of the anti-floating bolt at the anchoring interface from a microscopic perspective and improve the bearing capacity of the anti-floating bolt,the micro-mechanical mechanism of anchoring interface was analyzed based on the theory of asperity side contact.The variation law between the normal and tangential component force of the asperity and deformation was revealed in the elastic,elastic-plastic and plastic stages.The mechanical model for pull-out capacity of the anti-floating bolt was established at a microscopic level.The results show that,in the elastic and elastic-plastic stages,the dimensionless normal and tangential force exhibit nonlinear changes with the dimensionless deformation of the Z direction,while in the plastic stage,it approximately exhibits linear changes.Under the same dimensionless deformation,the dimensionless normal and tangential component force are related to the contact angle.Using the asperity side contact mechanics,simulation analysis was conducted.It provides a way to study the progressive failure of the anti-floating bolt at the anchoring interface.
关键词
抗浮锚杆/细观力学/微凸体/法向/切向Key words
anti-floating bolt/micromechanics/asperity/normal/tangential引用本文复制引用
基金项目
国家重点研发计划(2017YFC0805404)
国家自然科学基金(52278342)
出版年
2024
NETL
NSTL
万方数据