波流组合作用下钢板桩围堰的受力分析*

在涨落潮明显的河道中,如何在波流组合作用下确定钢板桩围堰的最小埋置深度,对钢板桩围堰的设计、施工具有重要的理论意义和实用价值。采用三维源汇分布法建立了大尺度结构物波浪力的数学计算模型,并叠加了通过《公路桥涵设计通用规范》相关公式得出的水流力,确定了围堰结构所承受的波流组合作用力。然后通过某实际工程的钢板桩围堰在"强流水、弱波浪"荷载组合和"强流水、强波浪"荷载组合下的围堰最小埋置深度的应用算例,验证了本文方法的可行性。最后讨论了波流组合作用与矩形围堰结构位移、转角的关系,并对影响围堰埋置深度的因素做了多参数分析,并得出了一些有益结论。

The Analysis of Cofferdam under Fluid Loads

In the channel for which ebb and flow is obvious, how to determine the minimum embedment depth of cofferdam under the force caused by wave and flow for the desingn of the cofferdam,ensuring the construction safety has important and practical value. In this paper,the threedimensional source destribution merhod is adopted to establish the mathematical calculation model of wave force for large scale structures,and superimposed by "General code for design of highway bridge and culverts"related formula of current force, to determine the cofferdam structure for the wave flow combination reaction. And then through the actual project of the steel sheet pile cofferdam in the "strong current ,weak wave load combination "and "strong current ,strong wave load combiation "of cofferdam for the minimum depth of embedment of application examples, the feasibility of the merhod was verified. Finally , we discussed the wave flow combined with rectangular cofferdam structure displacement and angle relationship, and the factors affecting the cofferdam embedment depth make the multi-parameter analysis, and some beneficial conclusions are drawn.