Under the coupling action of the vertical load and the horizontal load the bearing capacity of on micropiles is less reported because of the complicated interaction of pile and soil. Analytical solution of the bearing capacity of micropiles with different load combinations cannot be obtained. In the paper ABAQUS is used to analyze the deformation behavior and failure mechanism of micropile s when the load combination is taken into account. And the influence of different loading modes on the bearing behavior of micropiles is discussed. It is shown that the horizontal displacement at pile top is smaller when the vertical load is applied first and then the horizontal load is applied or the two loads are applied at the same time. The influence of different loading sequences on the lateral bearing behavior is greater than the vertical bearing behavior of micropiles. The tip resistance of pile is bigger when the vertical load is applied first and then the horizontal load is applied. On the contrary, the side friction of piles is smaller. And the influence of different loading sequences on the side friction is greater than the tip resistance of piles.%目前对于微型桩在竖向及水平荷载的耦合作用下的承载力方面研究较少.由于荷载、桩、土三者共同作用十分复杂,难以给出微型桩在不同荷载组合下承载力的解析解.运用ABAQUS有限元软件,分析组合荷载作用下微型桩的变形性状和破坏机理,探索了不同加载方式对于微型桩承载特性的影响.结果表明:与先施加水平荷载再施加竖向荷载相比,先施加竖向荷载再施加水平荷载与水平竖向荷载同时施加时桩顶水平侧移均较小;加载顺序变化对桩水平承载特性的影响要大于对桩竖向承载特性的影响;先施加竖向荷载再施加水平荷载时,桩端阻力的发挥较水平、竖向荷载共同作用以及先施加水平荷载再施加竖向荷载大,桩侧摩阻力的发挥正好相反,加载顺序对于桩端阻力的发挥程度影响更大.
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