船闸基坑边坡中桥梁基桩力学特性研究

STUDY ON MECHANICAL PROPERTIES OF BRIDGE PILES FOUNDATION INTHE PIT SLOPE OF A SHIP LOCK

为研究船闸软土基坑边坡中桥梁双桩基础的桩土相互作用复杂力学行为,计及渗流作用、滑坡推力、桩侧摩阻力、轴力效应及桩间土等因数影响,采用"m"法模拟桩土相互作用,根据力和力矩平衡条件建立桩基础控制微分方程,建立微分方程的二阶精度差分方程组,数值模拟基桩位移及内力。理论桩顶位移与现场监测桩顶位移吻合较好,验证了该文中理论分析方法的有效性,该理论分析方法可做实际工程设计与研究参考方法。

To investigate the complex soil-pile interaction of bridge piles foundation in the pit slope of a ship lock, as well as the influence of seepage, landslide thrust, lateral friction, the axial force effect and soil between piles and so on, the 'm' method was applied to simulate pile-soil interaction. According to the force and moment balance condition, governing differential equation and second order accuracy differential equations of pile foundation were established. Finite difference method was employed to solve the differential equations and analyze the displacement and internal force of the foundation piles. The results of the study shows that the foundation pit excavation of ship lock has an adverse influence on the stability of bridge piles foundation in slope and the safety of bridge. Therefore, measures needs to be taken to reinforce the bridge pile foundations. The numerical analysis results show good agreement with monitoring data, proving the effectiveness of the theoretical analysis method. This method can be used as a reference to practical engineering design and research.