全长注浆锚杆布设方式对边坡稳定性的影响分析  

Effect of wholly grouted cable layout mode on stability of slope

作　　者：林杭[1] 曹平[1] 李江腾[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《解放军理工大学学报（自然科学版）》2010年第2期137-141,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50774093);高等学校博士学科点专项科研基金资助项目(20060533071);中国博士后科学基金资助项目(20060400264);湖南省研究生创新基金资助项目(1343-74236000014)

摘　　要：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。To study the effects of inclination, installation position and layout type of cable on slope stability, a numerical calculation model was founded by FLAC3D, and the double-springs cable element was used to simulate the cable system. The safety factor of the slope was calculated as well as the cable mechanical responses. The analysis results show that the optimal cable inclination （OCO） exists and it increases with the cable length, that if the cable inclination exceeds the OCO, the relationship between the slope safety factor and the cable inclination is linear, and that the axial stress along the cable shaft increases at first then decreases, and the maximum value exhibits at the middle of the cable shaft. The results also indicate that the safety factor of the slope increases at first then decreases with the location of the cable moving downwards, that when the cable locates at the middle and the lower parts of the slope surface, the safety factor of the slope reaches the maximum value, that cables in the lower part have larger impact on the safety factor, and that the long-short cable changes the continuity of the slope slip plane, as well as its shape and the location, which leads to different reinforcement effects.

关 键 词：全长注浆锚杆 锚杆倾角 布设位置 布设形式 

分 类 号：TU457[建筑科学—岩土工程]