三维波浪与圆端形吊箱围堰相互作用的数值模拟  

Numerical Simulation of Interaction Between Three- Dimensional Wave and Round-End Boxed Cofferdam

作　　者：祝兵[1] 康啊真 邢帆[1] 韩兴[1] 

机构地区：[1]西南交通大学,四川成都610031

出　　处：《桥梁建设》2013年第6期82-87,共6页Bridge Construction

基　　金：国家自然科学基金资助项目(51178397);国家科技支撑计划(2012BAG05B00)~~

摘　　要：为研究波浪效应下不同吃水深度的圆端形吊箱围堰受波浪力的作用,运用多层σ坐标变换模型追踪随时间变化的波浪自由表面,引入浸没边界法(IBM法)处理不规则结构物界面,建立三维数值模型。以京沪高速铁路南京长江大桥7号墩施工采用的围堰为背景,运用建立的模型分析圆端形吊箱围堰与三维波浪的相互作用。分析结果表明:所建立的三维数值模型能够很好地模拟实际工程中三维波浪与不同吃水深度的截断柱体相互作用的问题;圆端形吊箱围堰不断下放的过程中,随着吃水深度的增加,围堰所受纵向波浪力呈上升的趋势、垂向波浪力减小,当吃水深度达到某一临界值并继续增加时,围堰所受波浪力的变化幅度很小。To study the wave forces subjected by the round-end boxed cofferdam having dif- ferent draught depth under the action of the wave effect, the multiple-layer σ coordinate transformation model was used to track the time-varying wave free surfaces and the immersed boundary method （IBM） was added to deal with the boundaries of the irregular shape structure and to es- tablish the three-dimensional numerical model. By way of example of the cofferdam used for con- struction of the Pier No. 7 of Nanjing Changjiang River Bridge on Beijing-Shanghai High-Speed Railway, the established model was then used to analyze the interaction between the round-end boxed cofferdam and the three-dimensional wave. The results of the analysis indicate that the model can well simulate the interaction between the three-dimensional wave and the truncated cyl- inder having different draught depth in the practical construction. In the incessant lowering of the round-end boxed cofferdam, with the increase of the draught depth of the cofferdam, the longitu- dinal wave force subjected by the cofferdam presents the tendency of increasing while the vertical wave force becomes decreased and at the time the draught depth reaches a certain critical value and continuously increases, the changing amplitude of the wave forces subjected by the cofferdam is quite little.

关 键 词：围堰 波浪效应 多层σ坐标 浸没边界法 数学模型 数值分析 

分 类 号：U445.556[建筑科学—桥梁与隧道工程]