双排桩支护永久性高填方边坡数值分析与应用研究

Study on numerical analysis and application of double-row piles used in permanent high filling slopes

结合某永久性高填方边坡工程实例,通过MIDAS-GTS有限元程序分别建立单排悬臂桩和双排桩有限元分析模型。对比分析了这两种支护形式的位移和内力分布规律,得出双排桩能够更好地控制边坡位移,内力分布更为合理。通过修改源模型对比分析了双排桩不同桩径、排距以及考虑填土注浆加固等情况下对支护结构的变形受力的影响,得出了最优设计施工方案,为双排桩支护结构在永久性高填方边坡的应用与推广提供了有益的参考。

Combined with practical permanent high filling slope work,the finite element models of the single-row cantilever piles and the double-row piles are established separately based on the finite element program MIDAS-GTS. The displacement and internal force distribution of the two retaining structures are compared. It is found that the displacement of the slope can be effectively controlled by using double-row piles. The impacts on the deformation and force of the retaining structures by modifying the original model with the different pile diameter,pile row spacing and considering grouting reinforcement are analyzed,and the best design and construction schemes are obtained. The successful case provides the beneficial reference for the application and popularization of double-row piles in permanent high filling slopes.