某岩质高边坡稳定性分析及预应力锚索加固设计

Stability analysis of a high rocky slope and its pre-stress anchorage cable design

某岩质公路边坡最大坡高63 m,针对该公路边坡开挖形成的裂缝问题,结合地质条件分析了边坡裂缝产生的原因。采用极限平衡法对边坡整体稳定和块体稳定进行了分析计算,并用二维有限元软件Phase2对边坡开挖过程进行了仿真分析,对边坡应力和变形规律进行了研究。在此基础上,确定了边坡加固方案和预应力锚索结构形式、参数及灌浆工艺。边坡裂缝经加固处理后,边坡各测点的变形值基本稳定,表明边坡加固设计方案合理,保证了边坡稳定。其经验可为相关边坡工程加固提供借鉴。

For a high rocky highway slope with maximum height of 63 m,the cause of slope crack formed in excavation was analyzed in view of local geological condition. The limited equilibrium method was used to analyze the overall stability as well as block stability of the slope,and 2D FEM software of Phase2 was applied to simulating the slope excavation process and studying the stress and deformation law of the slope. Based on this,a reinforcement solution including the structural form,parameters and grouting technique of pre- stress anchorage cable were determined. After reinforcement,the deformation values of all slope monitoring points are in stable status,proving the validity of the reinforcement solution and ensuring the slope stability. The experiences can provide reference for other relevant rocky slope reinforcement projects.