针对陕西省高速公路沿线抗滑桩治理的滑坡,进行桩顶位移预警判据研究。基于抗滑桩内力计算方法——“m”法,通过给定桩顶位移,反算滑坡推力,进而求出桩身最大弯矩。计算得到的推力考虑了桩前土体抗力和桩间距的影响,因此悬臂桩和埋入式桩均适用。经过大量试算拟合得出不同地基系数K、地基系数随深度增加的比例系数m、锚固段长度、悬臂段长度及桩径下,桩顶位移与桩身最大弯矩的关系式。该式适用于桩径为2 m×3 m、1.5 m×2 m的弹性桩。引用前人实例验证了公式的合理性,公式由初等函数组合而成,易于应用到预警系统中。今后针对具体抗滑桩设计方案,输入相关参数,可得到桩顶最大位移判据。 According to the landslide controlled by the anti-slide piles along the expressway in Shaanxi Province, the early-warning criterion of pile top displacement is studied. Based on the “m ” method of calculating the internal forces of anti-slide piles, the maximum bending moment of the piles is calculated by giving the displacements of the top of piles and inversely calculating the thrust of the landslide. The calculated thrust takes into account the influence of soil resistance and pile spacing before the pile, so cantilever pile and embedded pile are suitable. After a large number of trial and calculation, the relationship between the displacement of pile top and the maximum bending moment of pile body is obtained according to different coefficient of foundation K, coefficient of proportion of foundation coefficient increasing with depth m, length of anchorage section, length of cantilever section and pile diameter. The formula applies to pile diameter of 2 m × 3 m, 1.5 m × 2 m elastic pile. The example of predecessors is used to verify the rationality of the formula, the formula is formed by the combination of elementary functions, and is easy to apply to the early warning system. In the future, according to the design scheme of concrete anti-slide piles, the maximum displacement criterion of pile top can be obtained by inputting relevant parameters.