特殊地质条件下大跨度拱桥拱座设计方案比选分析

Comparative Analysis on Abutment Designs of Large-span Arch Bridge under Special Geological Conditions

针对大跨度上承式拱桥拱座下伏软弱基岩抗推能力不足的问题,可采用扩大基础配置抗推斜桩和竖桩的方式抵抗拱桥巨大推力。文章以总溪河特大桥工程为例,针对其拱座下伏软弱基岩、承载力差的问题,提出10°和45°两种斜桩拱座方案,并采用有限元计算模型进行分析比选,最终得出45°斜桩方案可以有效减小设计桩长,其受力更为合理。

In case of insufficient anti-push capacity of weak bedrock underlying the large-span arch bridge abutments,the huge arch thrust can be resisted by broadening the foundation configuration of anti-push inclined piles and vertical piles.Taking Zongxi River Bridge project as an example,aiming at its weak bedrock underlying the abutment and poor bearing capacity,this article proposed two inclined pile abutment programs respectively at 10 degrees and 45 degrees,and used the finite element calcu- lation model for analysis and comparison, and finally concluded that the 45-degree inclined pile design program can effectively reduce the design pile length,and its force is more reasonable.