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与平地上的桥梁基桩相比,高陡斜坡段桩柱式桥墩基础的承载机理主要包括陡坡效应和嵌固深度效应。首先,根据极限平衡理论推导了高陡边坡剩余下滑力的计算公式;其次,通过对桩柱微元进行受力分析,得到了高陡斜坡段桩柱式桥墩基础内力与变形分析的挠曲变形微分方程及其幂级数解答;经过模型试验的对比分析,验证了该解答的合理性。在此基础上,通过对某工程实例的对比分析,探讨了桩径、嵌固深度以及边坡安全系数等对基桩设计与验算的影响,进而提出了高陡斜坡段桩柱式桥墩基础的设计计算方法,以期为桥梁基桩设计提供参考。
Compared with bridge foundation piles on flat ground, the bearing mechanism of pile pier foundation in steep slope section mainly includes steep slope effect and embedding depth effect. First of all, the formula for calculating the residual sliding force of high-steep slope is deduced according to the theory of limit equilibrium. Secondly, the deflection analysis of the internal force and deformation of the pile pier with high-steep slope Deformation differential equation and its power series solution; Through the model test comparative analysis, verify the rationality of the solution. On this basis, through the comparative analysis of a project instance, the influence of pile diameter, depth of embankment and safety factor of slope on the design and checking of pile is discussed. Then, the foundation of pile-pier of high steep slope Design calculation method, in order to provide reference for the design of bridge foundation piles.