上海长江大桥桥墩冲刷坑深度研究

Study of Scoured Pit Depth at Piers of Changjiang River Bridge

在对长江口北港水沙条件以及河势进行分析的基础上,采用局部三维泥沙数学模型和局部正态物理模型2种手段预测上海长江大桥桥墩冲刷坑的最大冲刷深度,三维泥沙数学模型和局部正态物理模型的边界条件由大范围的长江口二维水流数学模型的计算结果提供。结果表明,2种手段预测得到的桥墩冲刷深度较为接近,可为桥梁设计提供科学依据。

On the basis of the analysis of the water flow, sediment conditions and river pattern of the north channel at the estuary of the Changjiang River, the local three-dimensional sediment mathematic model and the local normal physical model are used to predict the maximum depth of the scoured pits at the piers of Shanghai Changjiang River Bridge and the boundary conditions of the two kinds of the models are provided by the calculation results of the two-dimensional water flow mathematic model of the large range estuary of the Changjiang River. The results of the prediction show that the scoured pit depth obtained by the two kinds of the models is rather close and can serve as the scientific basis for design of the piers of the Bridge.