长江下游过江隧道工程河段极限冲刷深度研究

Maximum scouring depth for river reach of underwater tunnel project in lower reaches of the Yangtze River

针对长江下游过江隧道工程设计中如何合理确定最大埋深问题,以江阴第二过江通道隧道工程为例,分析近年来工程河段河床演变特性和水沙运动特征,从工程安全角度出发确定具有代表性的模型试验水沙控制条件。采用物理模型试验,对江阴第二过江通道隧道工程附近河床极限冲刷深度进行预测,并与数学模型计算结果进行对比分析。结果表明:物理模型与数学模型研究成果较为一致;不同水文条件下,河床普遍受到冲刷,左侧江阴副槽最大冲刷发生在深槽右侧,右侧主槽最大冲刷发生在深槽左侧。

It is important to reasonably determine the maximum burial depth for the design of the underwater tunnel project in the lower reaches of the Yangtze River.Taking the second tunnel project of Jiangyin as an example,this paper analyzes the characteristics of riverbed evolution and water and sediment movement of the project reach in recent years and determines the typical water and sediment control conditions for model tests from the point of view of engineering safety.The paper uses the physical model test to predict the maximum scouring depth of the riverbed near the second tunnel project of Jiangyin and compare the results with those calculated by the mathematical model.The results indicate that the research results of the physical model and mathematical model are consistent.Under different hydrological conditions,the riverbed is generally scoured.The maximum scour of the secondary channel of Jiangyin on the left side occurs on the right side of the deep channel,and the maximum scour of the main channel on the right side occurs on the left side of the deep channel.