高陡横坡段桥梁桩基设计计算方法及工程应用

在西部山区修建公路或铁路，常需将桥梁桩基设置在高陡横坡上。与平地上的桥梁桩基相比，位于横坡上的桥梁桩基受力与变形更为复杂，而相应的设计计算方法亦落后于工程实践。在前人研究的基础上，进一步分析了高陡横坡段桥梁桩基的受力特性，建立了其受力与变形分析的简化计算模型，并借助有限差分法，对个特征桩段的挠曲变形微分方程进行求解，从而提出了高陡横坡段桥梁桩基设计计算方法。最后，以张一花高速中某桩基工程为例，分别利用规范法和本文计算方法进行计算，结果对比分析表明，本文计算方法与规范法吻合较好，而本文计算方法既能够考虑了桩顶复杂荷载的影响，又能够考虑边坡荷载的作用，由此设计的基桩更为合理安全。

The Design and Calculation Method and Its Applications of Bridge Piles in Steep Cross Slopes

Bridge piles always need to be set in steep cross slopes, in order to build highway or railway in western mountain area. The internal force and distortion behavior of the pile is more complex than that of simple pile while the practical engineering design is fall behind. Based on previous researches, a further study on working characteristics of bridge pile and a simplified mechanical model is built to obtain the differential equation of the characteristic section of the pile then the finite difference solution which fit for the inner force and displacement of the pile is proposed. Finally, take a steep cross slope pile in Zhang - hua highway for example, the standard method and finite difference method calculation show a good agreement. While the proposed calculation method is more reasonable and safety for it can take both the influence of complex load and landslide thrust effect into account.