保德沿黄公路改道工程边坡坡脚冲刷试验

Erosion Experiment on Slope Toe of Diversion Project in Baoder Highway Along the Yellow River

针对黄河北干流东岸沿黄公路改道占用黄河河道情况,在现场查勘的基础上,通过对河道冲淤演变与洪水特点分析,确定了设计洪水。根据改移公路工程的情况,利用清水动床实体模型对不同工程边界条件下50 a一遇洪水路基坡脚处河床冲刷深度进行了试验。试验研究表明,在试验来流条件和桥下路堤完全被冲毁的情况下,公路路基平均冲刷深度为4.21 m,最大冲刷深度为9.04 m,最深点位置在桩号K0+550处;在试验来流条件和桥下路堤不被冲毁的情况下,公路路基平均冲刷深度为4.12 m,最大冲刷深度为7.56 m,最深点位置在桩号K0+800处。

Taking the highway diversion project in Fubao section from Xingxian to Baode over the north stream of the Yellow River as background,based on the site survey as well as the analysis of scour and silting evolution and the flood characteristics,the study determined the design flood. Based on the project,the clean-water movable-bed model was used to test the scour depth of river bed at the embankment toe in the case of once-in-fifty-year frequency flood under different project boundary conditions. The results show that the average scour depth of the roadbed is 4. 21m,the maximum scour depth is 9. 04 m,and the deepest position is at the stake K0＋500 under the conditions of the embankment under the bridge completely washed away;the average scour depth of highway roadbed is 4. 12 m,the maximum scour depth is 7. 56 m,and the deepest position is at the stake K0＋800 under the conditions of the embankment under the bridge not washed away.