嵌入式反压护道作用下软基路堤稳定性研究

Numerical analysis of the stability of soft foundation embankment with embedded loading berm

反压护道是一种常用软土路基处理方法,然而在有些路段没有反压护道的施作空间,文章提出嵌入式反压护道加固软基路堤。采用数值模拟分析方法验证嵌入式反压护道加固软基路堤的可行性,并研究嵌入式反压护道宽度和高度对稳定性的影响;分析嵌入式反压护道对路堤应力分布的影响,探讨嵌入式反压护道对软基路堤稳定性系数的影响力学机理。结果表明:嵌入式反压护道能够显著地提高软基路堤边坡稳定性,随护道宽度和高度的增加软基路堤稳定性系数增大,护道宽度对路堤稳定性系数影响比高度更大。嵌入式反压护道改善路堤的应力分布状态,从而改变了路堤稳定系数。数值计算获得的反压护道作用下软基路堤边坡的极限高度与极限平衡法获得的解析解几乎吻合,可采用极限平衡法对嵌入式反压护道破坏路堤稳定性进行计算和设计。

Loading berm is a common soft soil subgrade treatment method.However,there is no construction space for loading berm in some sections.This paper proposes embedded loading berm to strengthen soft foundation embankment.The feasibility of strengthening soft foundation embankment with embedded loading berm is verified by numerical simulation analysis method,and the influence of the width and height of embedded loading berm on the stability is explored.On this basis,the influence of embedded loading berm on stress distribution of the embankment is analyzed,and the mechanical mechanism of embedded loading berm on the stability coefficient of soft foundation embankment is discussed.The results show that the embedded loading berm can significantly improve the slope stability of embankment on soft foundation.With the increase of berm width and height,the stability coefficient of embankment on soft foundation increases,and the influence of berm width on embankment stability coefficient is greater than that of height.The embedded loading berm improves the stress distribution of the embankment and changes the stability coefficient of the embankment.The limit height of soft foundation embankment slope under the action of loading berm obtained by numerical calculation is almost consistent with the analytical solution obtained by limit equilibrium method.The limit equilibrium method can be used to calculate and design the stability of embankment damaged by embedded loading berm.