高速铁路桥梁钻孔桩基础设计

钻孔桩基础在高速铁路桥梁设计中得以广泛运用。桩基础类型的选择及设计多受地质、墩台类型等影响,制约因素多,尤其是应用于高速铁路设计时,其承载性能直接关系到高速铁路的舒适度以及运营安全。根据在实际工作中的设计经验,从宝鸡至兰州高速铁路客运专线桩基础设计要求入手,在桩基础类型选择、桩长拟定、单桩承载力确定这几个方面阐述了高速铁路桩基础设计要点,对其他高速铁路桩基础设计具有一定的参考借鉴和指导意义。

Design of Bored Pile Foundation of Bridge on High-Speed Railway

At present bored pile foundation has widely been adopted in the design of high-speed railway bridge. However,the selection and design of pile foundation type are often restricted by several factors, such as geological condition,bridge pier type and abutment type. Especially,when being adopted in the bridge design of high-speed railway,the load-bearing capacity of bored pile foundation will be directly related to the riding comfort level and operation safety of high-speed railway. For this reason,this paper, in combination with design experience in practical works,and in view of the design requirement of bored pile foundation of Baoji-Lanzhou passenger dedicated line,expounds the key points of pile foundation design of high-speed railway,including how to select the pile foundation's type,how to design the length of a pile,and how to determine the load-bearing capacity of single pile. The paper can serve as reference and guidance to a certain degree for the design of pile foundation of other high-speed railway bridge.