杜云楼,冯国瑞,康红普,张玉江,ZHANG Xihong

• 1:太原理工大学矿业工程学院
• 2:山西省绿色采矿工程技术研究中心
• 3:Centre for Infrastructural Monitoring and Protection
• 4:School of Civil and Mechanical Engineering

摘要(Abstract)：

黏结长度是影响锚杆承载性能的关键因素之一,研究不同黏结长度锚杆的拉拔承载特性对锚杆支护设计具有重要意义。为此,基于锚固界面的"三线性"黏结-滑移模型,采用FLAC3D数值软件研究了不同黏结长度锚杆的拉拔承载特性。研究结果表明:黏结长度会显著影响锚杆拉拔载荷-位移曲线的形态和发展过程,增大锚杆黏结长度能够提高其承载能力,提高锚杆抵抗失效的能力。随着黏结长度的增加,锚杆峰值拉拔载荷先快速增大后稳定增大,锚杆软化载荷和摩擦载荷先逐渐增大后保持不变,锚杆存在临界黏结长度。拉拔载荷作用下,锚杆轴力沿锚杆长度方向逐渐降低,峰值剪应力最先出现在锚杆加载端,并逐渐向锚杆自由端移动。随着黏结长度的增加,锚杆轴力作用范围增大,锚杆剪应力的不均匀性增加。研究结果可为锚杆支护设计提供有益参考。

关键词(KeyWords)： 黏结-滑移关系;拉拔试验;黏结长度;承载特性

Abstract:

Keywords:

基金项目(Foundation): 国家杰出青年科学基金资助项目(51925402);; 国家自然科学基金资助项目(U1710258,52004172);; 中国博士后科学基金资助项目(2020M 682215)

作者(Author): 杜云楼,冯国瑞,康红普,张玉江,ZHANG Xihong

DOI: 10.13532/j.jmsce.cn10-1638/td.20210125.001

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