钢吊箱围堰三维模拟分析及结构改进

3D simulation analysis and structural improvement of steel box cofferdam

以龙溪嘉陵江特大桥9#墩双壁钢吊箱围堰为例,系统研究了在水位落差大、河床洲滩冲淤变化大、水流流速急等复杂水文地质条件下,钢吊箱围堰设计的三维模拟分析方法。研究结果显示:钢吊箱围堰设计方案在各工况下稳定性指标均满足要求,结构设计合理;与3356组相同工况下的实测数据进行对比分析,本研究建立的三维模拟模型计算值的平均误差为3.37%,最大误差为29.85%,计算结果较精确,可为同类工程的研究和应用提供一定的借鉴。

The double-wall steel box cofferdam at pier 9#of Longxi Jialingjiang grand bridge was taken as an example to systematically study 3D simulation analysis method for steel box cofferdam design under complex hydrogeological conditions of the big drop in water level,the great change in river bed erosion and the rapid flow velocity.The research results show that the design scheme of the steel box cofferdam meets the requirements of the stability index under all working conditions,and the structural design is reasonable.Compared with 3356 groups of measured data under the same working conditions,the average error of the calculation results of the 3D model is 3.37%,and the largest error is 29.85%.So the calculation results of the 3D model are accurate relatively,which can provide some reference for the research and application of similar projects.