基于数值方法的高路堑边坡加固优化设计

Optimization of High Cutting Slope Reinforcement Based on Numerical method

锚杆框架梁预应力锚索是加固高路堑边坡的有效方式。采用有限差分软件对赣龙铁路上杭北站高路堑边坡稳定性、锚杆及锚索的加固效果、边坡加固设计参数进行了分析。结果表明:无加固措施条件下进行开挖,边坡安全储备较低,须进行加固处理;边坡稳定系数随着锚索锚固段长度的增加及间距的减小而增大。在数值分析的基础上,对边坡加固参数进行优化,采用锚杆及锚索加固后,边坡稳定性显著提高,加固效果较好。建议锚索锚固段设计长度为6 m,锚索间距为4 m。该分析方法可为类似工程的设计优化提供参考。

Anchor frame beam with prestressed cable is an effective method to reinforce high cutting slope.In this paper,high cutting slope stability,rockbolt and anchor cable effect,slope reinforcement parameters in Hangzhou North Station of Ganzhou-Longyan Railway were analyzed using finite difference software.The results showed that slope safety margin is lower if cut without reinforcement measures,so the slope must be reinforced.Slope stability factor increased with anchoring length increased and space reduced.Based on numerical analysis,slope reinforcement parameters are optimized.Slope stability will be improved significantly after reinforced with rockbolt and anchor cable,which received better reinforcement effect.It is recommended that the designed cable length is 6 m and space is 4 m.This method can serve as a reference for optimization of the similar engineering.