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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。
At present, little research has been done on the bearing capacity of micro pile under the coupling of vertical and horizontal loads. Due to the complex interaction of load, pile and soil, it is difficult to give an analytical solution for the bearing capacity of micro-piles under different load combinations. The ABAQUS finite element software is used to analyze the deformation behavior and failure mechanism of the micro-piles under the combined load, and the influence of different loading methods on the bearing characteristics of the micro piles is explored. The results show that, compared with the first application of horizontal load and then the application of vertical load, the horizontal displacement of pile top is small when the vertical load is applied first and then the horizontal vertical load is applied simultaneously. The change of loading sequence affects the horizontal bearing capacity When the vertical load is applied first and then the horizontal load is applied, the resistance at the end of the pile exerts more than horizontal and vertical loads, and the horizontal load and the horizontal load are applied first, then the vertical load is large, and the pile Side frictional force exerted on the contrary, loading sequence for the pile tip resistance exert more influence.