静载与循环荷载作用下的锚杆拉拔数值模拟分析  

Numerical Simulation Analysis of Anchor Rod Drawing under Static Load and Cyclic Load

作　　者：陶春晨 翟树利 苏汉军 TAO Chun-chen;ZHAI Shu-li;SU Han-jun(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou,Hebei 075000;Beiwang Construction Group Co.,Ltd.,Chengde 067000,Hebei)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]北旺建设集团有限公司,河北承德067000

出　　处：《河北建筑工程学院学报》2020年第2期25-29,共5页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：河北建筑工程学院研究生创新基金(XY202007)。

摘　　要：为研究土层锚杆在静载与循环荷载作用下的锚固机理。采用FLAC3D有限差分软件建立单根锚杆拉拔计算模型,对静载与循环荷载作用下锚杆不同位置的轴力及水泥砂浆-土体界面剪应力及其分布规律进行数值模拟研究。静载作用下锚杆数值分析结果表明:锚杆顶端的轴力最大,并且沿着锚固深度呈逐渐减小趋势;随着拉拔力增大,界面剪应力峰值沿锚固深度移动,土层锚杆两端界面发生塑性破坏;锚杆周围土体位移逐渐增大,且土体发生位移的区域传递到到远离锚杆的区域。循环荷载作用下锚杆数值分析结果表明:正弦波的频率与幅值对界面剪应力有较大影响,界面剪应力沿着锚固深度呈先增后减的趋势。在锚固长度的1/10处,界面剪应力达到峰值,锚固体两端的界面剪应力较小,锚固体两端发生塑性破坏。In order to study the anchoring mechanism of soil anchor under static load and cyclic load.Using FLAC3D finite difference software to establish a single bolt pull-out calculation model,the axial force of anchor rod at different positions and the shear stress and its distribution law of cement mortar soil interface under static load and cyclic load are studied.The results of numerical analysis of anchor under static load show that,the axial force at the top of the bolt is the largest,and decreases gradually along the anchoring depth;with the increase of drawing force,the peak value of interfacial shear stress moves along the anchoring depth,and plastic failure occurs at both ends of soil anchor;the displacement of soil around the anchor increases gradually,and the displacement area of soil transfers to the area far away from the anchor.The results of numerical analysis of anchor under cyclic load show that,the frequency and amplitude of sine wave have great influence on the interfacial shear stress,and the interfacial shear stress increases first and then decreases along the anchoring depth.At 1/10 of the anchorage length,the interfacial shear stress reaches the peak value,and the interfacial shear stress at both ends of the anchorage is small,and plastic failure occurs at both ends of the anchorage.

关 键 词：静载 循环荷载 界面剪应力 

分 类 号：TU472[建筑科学—结构工程]