三维波浪作用下钢吊箱围堰下放过程受力研究  

Study of Three-Dimensional Wave Forces on Lowering of Steel-Suspending Cofferdam

作　　者：黄博[1] 段伦良 祝兵[1] HUANG Bo;DUAN Lunliang;ZHU Bing(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2018年第3期525-532,共8页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51178397);四川省应用基础研究重大前沿项目(2017JY0003)

摘　　要：为了解跨海大桥桥台施工过程中哑铃型钢吊箱围堰与波浪的相互作用,研究了围堰下放过程中所受的波浪力.基于RANS方程和k-ε湍流方程建立了波浪-围堰相互作用三维数值模型,并采用流体体积法捕捉自由液面.该模型不但考虑了钢护筒对围堰周围波浪场影响,而且考虑了围堰的整个动态下放过程.结果表明:钢护筒的存在以及围堰动态下放过程均会对围堰周围波浪场产生显著影响,考虑钢吊箱围堰动态下放过程时的受力较固定淹没深度处围堰的受力增大10%;随着波浪高度和波浪周期增大,钢吊箱围堰在下放过程中所受最大水平力呈现增大趋势.In order to understand the interaction between dumbbell shaped steel boxed cofferdam and wave during the construction of the bridge across the sea. The interaction between a steel-suspending cofferdam and wavesis studied,to investigate the influence of waves on the construction progress of the large dumbbell cofferdam. A numerical model for wave-cofferdam interactions is established,in which the Reynolds-averaged Navier-Stokes equations and k-ε model are used to generate waves,while the VOF（ volume of fluid） method is used to trace the water surfaces. The influence of the steel tube and the lowering of the cofferdam on the wave field around the cofferdam are considered. The numerical simulation results show that the steel tube and lowering of the cofferdam have significant effects on the wave field around the cofferdam. Consideration of the lowering of the steel-suspending-cofferdam,the wave forces on the cofferdam will be 10% larger than that on the cofferdam with a certain submerged depth. With increments of the wave height and wave period,the wave forces acting on the lowering steel-suspending cofferdam tend to increase.

关 键 词：波浪作用 围堰 三维模型 数值模拟 

分 类 号：U445.55[建筑科学—桥梁与隧道工程]