预应力锚索框架梁边坡支护数值模拟

基于贵阳市小河区某公路滑坡,拟采用预应力锚索框架梁进行治理。通过FLAC-3D软件对这一支护体系进行效果评价,得出位于支挡面上部的结构体系受力较大,其中竖梁所受弯矩要大于横梁,运用时宜加强竖梁的设计。支挡面顶部的滑体位移要大于底部,由于锚索不能承受压力,致使框架梁发生转动,因此设计时宜把底部一排的锚索换成全黏结锚杆。锚固长度为6 m时支护效果最佳,增大锚固长度对支护效果没有实质性的提高。

Numerical Simulation of Slope Supporting for Prestressed Anchor with Frame Beam

Prestressed anchor with frame beam was used to evaluate the stability of the highway landslide in Xiaohe District,Guiyang City.The slope supporting system was evaluated by the software FLAC-3D.The results showed that the stress of structure system on the top of supporting surface was larger than that on the bottom,flexural moment of the vertical beam was larger than horizontal beam,so the design of vertical beam should be enhanced;the landslide displacement on the top of supporting surface was larger than that on the bottom,frame beam rotated because prestressed anchor could not under stress,so the anchor on the bottom should be replaced with bonded anchor rod;supporting effect was best when the length of anchoring body was 6 m,and increasing the length could not improve the supporting effect.