考虑不同位置单根锚杆破坏对框架预应力锚杆柔性边坡支护结构的影响分析

Analysis on the influence of single anchor failure at different positions for grillage flexible supporting structure with prestressed anchors

本文基于FLAC-3D软件对某一边坡工程实例进行了数值模拟分析,从安全系数、边坡位移、锚杆轴力分析了不同位置单根锚杆破坏对该边坡的影响,从而为以后可靠度分析奠定一定的基础。根据数值模拟结果得出如下结论:越靠近边坡底部锚杆的破坏对该边坡安全系数的影响越大;最后一排锚杆的破坏对应的该点产生的坡体位移最大,不同位置锚杆的破坏,对相邻上下锚杆对应的土体位移影响较大;中间不同位置锚杆的破坏只对与该锚杆邻近的上下左右8根锚杆的轴力有主要影响,第一排锚杆和最后一排锚杆只对其邻近的5根锚杆的轴力影响较大,对其他锚杆的影响较小,可忽略不计。

Based on the numerical simulation analysis software FLAC-3D for certain project example,the influences of the single anchor failure at different positions on grillage flexible supporting structure with prestressed anchors are analyzed from three aspects such as the safety factor,the slope displacement and the anchor axial force,which provide the basis for the further reliability analysis.The following conclusions according to the results of numerical simulation are obtained： the impact of the anchor failure closer to the bottom of the slope on the safety factor is great;the slope displacement corresponding to the point of the failure of the last row anchor is maximum,and the failures of the anchors at different positions have great influence on the soil displacement corresponding to the adjacent anchors;for the axial force of anchor,the failure of the anchor at the middle position only has the major influence on the 8 anchors adjacent to the up and down,left and right.The failures of the first and the last row anchors only have influences on the adjacent 5 anchors,and have little impact on the other anchors.