钢绞线-锚杆捆绑式支护结构加固边坡影响因素数值分析

Numerical analysis of influence factors for a new bundled supporting structure of the steel strand-bolt reinforced slope

为了更好地推广应用钢绞线-锚杆捆绑式新型支护结构,采用FLAC3D软件建立模型进行加固效果影响因素数值计算。研究结果表明:1锚杆张拉阶段,纵横梁对岩土体的主动挤压产生的被动压力为地基反作用力;锚杆工作阶段,边坡体产生滑移变形,纵横梁下的滑坡土体挤压框架梁产生的主动压力为地基反力;2钢绞线-锚杆支护结构加固效果的主要影响因素为锚杆预应力大小、锚杆锚固角大小和锚杆布设间距;3增大锚杆预应力是抑制边坡变形十分有效的手段,但是盲目增大锚杆预应力会引起边坡的主动破坏;锚杆预应力一定时,锚杆越趋近于垂直于边坡坡面的角度,锚固时锚固支护效果更佳;在其他参数一定时,适当减小锚杆布设间距有利于边坡稳定性的提高。

In order to improve the application of a new bundled supporting structur of steel strand-bolt, the model based on FLAC3D for numerical calculation of the reinforcement effect factors is established.The results show： （1）when bolts are tensioning, the passive pressure produced by active extrusion of frame beams on rock is reaction of foundation; when bolts are working, the slope slip occurred, the active pressure produced by extrusion of land- slide soil on frame beam is reaction of foundation; （2）the influence factors of the steel strand-cable structure reinforcement effect are the prestress of the bolts, the anchoring angle of the bolts and the layout spacingof the bolts; （3）increasing the anchor prestress is a very effective means for controlling the slope deformation, however,it will cause the slope active failure to increase the prestress of the bolts blindly; the prestress of the bolts is constant, and the anchor supporting effect is better when the bolts are close to be perpendicular to the slope;the other parameters are constant, it is useful for improving the stability of the slope to decreases the layout spacing properly.