基于FLAC^3D的锚索抗滑桩滑坡推力分布规律研究

采用FLAC^3D建立了预应力锚索桩板墙结构的三维数值模型，结合有限元强度折减法分析了不同预应力作用下锚索桩滑坡推力的分布规律，并通过改变桩后岩土体的弹性模量及性质、锚索的设置位置以及边坡强度安全储备系数等参数，对锚索桩滑坡推力的分布规律进行了系统的研究。结果表明，在地质条件不变的情况下，随着锚索预应力的增大，桩后滑坡推力的分布图形逐渐由梯形向矩形变化；预应力对桩后滑坡推力分布的影响，取决于其与桩背总桩土相互作用力的相对大小，而不是其绝对大小。说明预应力的大小是影响桩后推力分布形式的一个非常重要的因素，照搬普通抗滑桩固定不变的推力分布形式对锚索桩进行设计，显然是不合理的。

Research on Distribution Law of Landslide Thrust of Anchored Anti-slide Pile Based on FLAC^3D

The three dimensional numerical model of prestressed anchored pile retaining wall was built with Software FLAC^3D in this paper and combing with the strength reduction FEM, the distribution laws of the landslide thrust on the anchored anti-slide pile with different cable prestress were analyzed for different elastic moduli and properties of the rock soil body, the setting positions of the anchor cable and safety factors of slope. The results show that, under the like geo- logical condition, the distribution shape of the soil pressure on the anchored anti-slide pile would change from trapezoid to rectangle gradually when the value of prestress increased, and the influ- ence of prestress on distribution law of landslide thrust depends on the relative size of the total pile soil interaction force, but not its absolute size. It indicates that the value of prestress is a very important factor influencing the distribution law of the landslide thrust on the anchored anti-slide pile, copying the fixed landslide thrust distribution form for general anti-sliding pile for anchored pile design is unreasonable.