基于强度折减法的土工格室加筋路堤稳定性分析

Stability analysis of geocell reinforced embankment with strength reduction method

由于加筋复合路堤分析中难以直观看到筋材的参数改变对整个工程的稳定性贡献,为了更加深入了解土工格室加筋的效果,设计用有限元分析软件结合强度折减法(strength reduction method,SRM)对一个二级公路路堤进行数值计算.首先,对三维建模的不加筋路堤进行SRM计算,再用极限平衡方法验证,两种方法得到的结论吻合.这表明更接近实际情况的三维路堤边坡建模分析方法适合在复杂的加筋工况中使用.然后,用此方法分析了铺设土工格室后的路堤稳定性,通过改变土工格室的焊距、埋深、高度、铺设层数来探究材料参数因素与边坡安全系数之间的规律.结果表明,土工格室材料可以起到提高路堤整体稳定性的作用,其中焊距较小、高度较高的土工格室的加筋效果较明显;多层加筋的路堤被破坏时会形成多弧段的破裂面.

It is difficult to see the contribution of changes in reinforcement parameters to a project with existing methods that analyze reinforced composite embankment. This paper uses a finite element software combined in conjunction with the strength reduction method（SRM） in numerical calculation to understand the effect of reinforcement of geocell.Calculations of 3 D structural models for different reinforced embankments are carried out based on SRM. The results conform to that obtained by using limit equilibrium, and indicate feasibility of the proposed method for analyzing embankments under complex working conditions of the reinforcement. Stability of embankments with geocells is analyzed using the method. Influences of welding distance, buried depth, height and number of layers are then investigated. The results show that the geocell can increase global stability of the embankment. Also, effect of reinforcement can be improved by decreasing welding space and increasing height of the geocell. A fracture surface with several separate arcs will appear in the reinforced embankment with multi-layer geocells.