隔离桩在填方边坡邻近桥桩中的参数优化分析

Optimization of the Isolation Pile Arrangement for the Adjacent Pile Supported Bridge in a Fill Slope

采用有限元数值分析方法,对某邻近桥桩高填方边坡工程中隔离桩的桩长、桩径和与桥桩的距离等进行参数化分析,研究了隔离桩对桥桩的位移、弯矩及填方边坡的整体稳定性的控制效率。结果表明:①桩径大的隔离桩对桥桩的保护效果好;距离坡脚近的隔离桩,对边坡整体稳定性保护效果好。②隔离桩的桩长在2~2.5H时,邻近坡脚,对桥桩的水平位移和弯矩的控制效果越好,也对边坡的整体稳定性控制效果更好。③隔离桩的桩长和与桥桩的距离对桥桩弯矩的控制效率较水平位移更高。相关结论可为类似工程提供借鉴。

To investigate the effect of isolation pile on the horizontal displacement,bending moment in piles that supporting the bridge structure and on the global stability control, thefinite element analysis was performed. The factors such as isolation pile length, pile cross section size, and distance to the piles that supporting the bridge structure, were analyzed in the numerical investigations. Results suggest that: 1) The isolation pile with large diameter has good protection effect on the bridge piles;isolation piles that are close to the toe of slope, it’s benefit to the global stability of the slope. 2) When the isolation pile length is 2~2.5H, the closer to the slope toe, the better the control effect on the horizontal displacement and bending moment in bridge piles. The more remarkable the control effect of the global stability of fill slope.3) The isolation pile length and the distance from the bridge piles are more efficient in controlling the bending moment than the horizontal displacement in piles that supporting bridge structure.