重庆长江隧道河床演变及冲刷预测

过江隧道隧址断面河床冲刷深度直接关系到工程规划的经济性和工程运行的安全性,因此合理预测河床冲刷深度至关重要。在国内外学者研究成果的基础上,以重庆长江过江隧道为例,根据三峡变动回水区近期水沙资料及水库运行资料分析工程河段河床演变及隧址断面冲淤变化,采用多种常用的冲刷计算公式对不利水文条件下隧址断面的河床冲刷深度进行预测。结果表明,确定过江隧道隧址断面河床冲刷深度为4. 8 m。研究成果可为类似工程提供参考。

Riverbed evolution and erosion prediction of the Yangtze River-crossing tunnel in Chongqing

The erosion depth of river-crossing tunnel site section is directly related to the economics of project design and the safety of project operation,so reasonable prediction is of crucial importance.On the basis of studies of domestic and foreign scholars,we take the Yangtze River tunnel in Chongqing as a case study,analyze the riverbed evolution and the erosion changes of tunnel section according to the data of hydrologic conditions and the reservoir operation in the Three Gorges fluctuating back water area,and predict the erosion depth of the riverbed at river-crossing tunnel section under adverse hydrological conditions by some commonly used erosion calculation formulas.The results show that the predicted erosion depth of river-crossing tunnel site section is 4.8 m.The achievement can provide the references for the similar projects.