冲沟路基稳定性影响因素的三维有限元分析

冲沟地形的特殊性决定冲沟路基稳定性应该借助于三维方法进行分析,三维有限元方法能够对复杂地貌、地质条件的各种岩土工程进行分析计算.本文结合强度折减技术,利用三维有限元方法分别对不同的岸坡坡度、沟底宽度和沟底纵坡条件下冲沟路基进行稳定系数的计算,计算结果表明冲沟路基稳定性存在明显的三维效应问题,两岸的坡度越陡、沟底越窄对路基的稳定就越有利,过陡的沟底纵坡不利于路基的稳定.因此,评价冲沟路基稳定性时应适当考虑三维效应的影响.

3D Finite Element Analysis of Influencing Factors of Gully Embankment Stability

The specificity of gully terrain requires that the gully embankment stability should be analyzed by three dimensional methods. 3D finite element method can be used to calculate and analyze various geo -technical projects with complicated terrains and geology conditions. Combined with strength reduction technique in this paper, stability coefficients of the gully embankment are calculated by 3D FEM for different side grade, bottom width and bottom grade. The computing results show that there is an obvious 3D effect in the gully embankment stability. The embankment is more stable when the gully side grade is steeper and the bottom width is narrower. Oversteep longitudinal gradient is against the stability of embankment. It is therefore argued that 3D effect should be properly considered when evaluating the gully embankment stability.