锚杆布置形式对多级边坡加固效果的影响分析

Analysis on the Influence of Anchor Rod Layout Forms on the Reinforcement Effect of Multi-stage Slope

为了研究不同锚杆布置形式下的边坡加固效果,以资溪花山界(赣闽界)至里木高速公路深路堑边坡为研究对象,运用有限差分软件FLAC3D建立数值计算模型,结合现场实测数据,分析了锚杆布置形式对锚杆轴力分布规律以及深挖路堑边坡稳定性的影响。结果表明:锚杆轴力沿其长度方向不是均匀分布;锚杆长度的增加能够显著改善锚杆本身的加固效果,同一布设位置、相同长度锚杆的加固效果不受锚杆整体布置形式的影响;相同长度、布设位置不同的锚杆在极限状态下发挥着相近的作用;在锚杆总长度保持不变的情况下,锚杆布置形式的改变对边坡稳定性的影响很小。

In order to study the effect of slope reinforcement in different anchor rod layout forms, a numerical calculation model for the slope was established by using finite difference software FLAC3D, based on the deep cut slope of Huashanjie--Limu Highway of Zixi. The effect of anchor rod layout forms on the distribution law of the anchor axial force and the stability of deep excavation cut slope was analyzed combining with the site test data. The results show that the axial force of the anchor rod does not distribute uniformly along its length ; with the increase of anchor length, its reinforcement effect can be improved significantly, and the reinforcement effect of the anchor rod with same length and layout position is not affected by the overall layout form of the anchor rod; anchors with the same length but in different positions play a similar role in the limit state; when the total length of anchors remains constant, the change of anchor layout forms has little influence on the stability of slope.