基于山区浅覆盖层花岗岩地质桥梁基础优化设计

Foundation Optimization Design of Bridge Under Shallow Covering Granite Geological in Mountainous Area

对于常规高架桥,为满足受力要求,桥梁基础形式多采用桩基础结构。论文以某高速公路桥梁为例,基于桥梁所处的特殊的浅覆盖层花岗岩地质条件对桥梁下部基础进行优化设计,将桩基础优化为扩大基础。通过分析得出结论:对于一般桥墩,将桩基础优化为扩大基础可满足受力要求;对于固结桥墩,在地震力作用下无法满足受力要求,需维持原桩基础设计。

For the conventional viaduct, pile foundation structure is often used as bridge foundation to meet the stress requirements.This paper takes a highway bridge as the example, makes an optimal design of bridge foundation based on the special shallow overburden granite geological conditions, the pile foundation is optimized as extended foundation. The conclusion is drawn from the analysis: for general pier,the pile foundation can be optimized as enlarged foundation to meet the stress requirements;as for the consolidated pier, it cannot meet the stress requirements under the action of seismic force, so the original pile foundation design should be maintained.