全长注浆锚杆布设方式对边坡稳定性的影响分析

为了分析锚杆倾角、布设位置和布设形式对边坡稳定性的影响,通过FLAC3D建立数值计算模型,利用双弹簧cable单元建立锚杆系统,计算边坡安全系数以及锚杆的力学响应。表明:(1)锚固边坡存在最优锚固角,其随锚杆长度的增加而逐渐增大;锚杆倾角超过最优锚固角后,边坡的安全系数与锚杆倾角符合线性关系;锚杆轴力沿杆体呈先增大后减小的趋势,最大值出现在杆体中间;(2)随着锚杆布设位置的下移,边坡安全系数呈先增大后减小的趋势,当锚杆布设在坡面中下部时得到的安全系数最大;(3)下排锚杆对安全系数的影响较大;长短相间锚杆破坏了原始滑动面的连续性,改变滑动面形状和位置,引起不同的加固效应。

Effect of wholly grouted cable layout mode on stability of slope

To study the effect s o f inclinat io n, installat ion po sit ion and layout type o f cable o n slope stability, a numerical calculat io n model w as founded by FLAC3D, and the double-springs cable element w as usedto simulate the cable system. T he safety factor o f the slo pe w as calculated as w el l as the cable mechanicalresponses. The analysis result s show that the opt imal cable inclinat ion ( OCO) exists and it increases w iththe cable length, that if the cable inclinat ion ex ceeds the OCO, the r elat ionship betw een the slope safetyfactor and the cable inclinat ion is linear, and that the ax ial st ress alo ng the cable shaft increases at f irstthen decreases, and the max imum v alue exhibit s at the middle of the cable shaf t . T he result s also indicatethat the safety factor o f the slope incr eases at f irst then decreases w ith the locat ion of the cable movingdownw ards, that w hen the cable locates at the middle and the low er part s of the slo pe sur face, the safetyfactor o f the slope reaches the max imum value, that cables in the low er par t have larger impact on the safetyfactor , and that the long-sho rt cable changes the continuity of the slope sl ip plane, as w ell as it s shapeand the location, w hich leads to different reinfor cement ef fects