考虑局部冲刷影响的钱塘江过江隧道最大冲刷深度试验研究

Experimental Study on the Maximum Scour Depth of River-crossing Tunnel Considering the Effects of Local Scour

钱塘江河口河床是冲淤变幅大的地区,过江隧道最大冲刷深度常成为工程设计的关键参数之一。以青年路过江隧道为例,运用正态水槽模型试验,分别模拟了过江隧道河段的自然冲刷和邻近涉水工程如丁坝引起的局部冲刷,分析两类冲刷对隧道的影响,并从工程安全出发,提出了最大冲刷深度的确定方法,与其他研究手段比较,结果较为一致,可为过江隧道、海底管线等隧道的合理设计提供科学依据。

In the areas of Qiantang river estuary with large variation range of riverbed erosion and deposition, the maximarn scour depth is one of the key parameters in engineering design of the river- crossing tunnels. Taking Qingnian road river- crossing tunnel for example, we used normal flume model to simulate the natural erosion of fiver- crossing tunnel reach and local scour caused b~, spur dike and other adjacent wading projects, to analyze the impact of two types of erosion to ttmnels, and put forward a method to determine the maximum scour depth from the perspective of engineering safety. The results agree well with other research methods, so the study can provide scientific basis for the reasonable design of cross- river tunnel, submarine pipelines tunnel, and so on.