高陡边坡桥梁桩基受力特征研究

Study on Mechanical Characteristics of Bridge Pile Foundation in High and Steep Slope

摘要:

在山地复杂的工程地质条件下，位于高陡边坡上的桥梁桩基不仅承担着桥梁上部结构传递下来的竖向力、水平力和弯矩作用，同时也承担着边坡变形引起的侧向力，桩基与边坡组成了复杂的承载体系。为了探究高陡边坡位置桥梁桩基与边坡土体之间的相互作用，首先要对边坡土体的稳定性进行研究，找出可能发生的滑动体以及这些滑动体对桩身施加的滑动推力；然后将基桩划分成若干段，逐段分析每一段桩的受力状况，建立起高陡边坡路段滑动面以上和以下基桩受力的微元模型，据此建立桩基受力的挠曲方程；最后得出基桩的内力和位移变形，为高陡边坡路段桩基设计提供依据。

Abstract:

In the complex geological conditions of mountainous areas, the bridge pile foundation located in high and steep slopes not only bears the vertical and horizontal forces and bending moments transmitted by the bridge superstructure, but also bears the lateral forces caused by slope deformation. The pile foundation and slope form a complex bearing system. In order to explore the interaction between the bridge pile foundation located in high steep slope and the slope soil, the stability of the slope soil is studied to find the possible sliding bodies and the sliding thrust exerted by these sliding bodies on the pile body. Then the foundation pile is divided into several sections, and the load condition of each section is analyzed in turn. The microelement model of the pile force above and below the sliding surface in the high and steep slope road section is established. On this basis, the bending equation of the pile foundation load is established. Finally, the internal force and displacement deformation of the pile are obtained, which provides the basis for the design of pile foundation in the road section of high-steep slope.