沿河路基冲刷机理与冲刷深度

Scour depth and mechanism of highway subgrade along river

沿河公路路基冲刷是公路水毁中的一个主要类型 ,而最大冲刷深度将直接影响沿河路基的安全。在对沿河路基水毁的水力机理和泥沙运动规律进行理论分析的基础上 ,对凹岸最大冲刷深度的影响因素 ,进行了合理划分和适当简化 ,采用人工弯道概化模型试验方法进行了不同条件下的冲刷试验。结合野外调查资料 ,对试验数据进行回归分析 ,建立了最大冲刷深度与主要影响因素 (水深、泥沙粒径、河宽、河弯半径 )的关系式。经实测资料验证 ,该关系式能够比较准确的反映工程实际情况。

The scour of subgrade along river side is a main type of the highway washout of flood, the maximum scour depth would effect the subgrade safety directly.Based on the theory analysis of the mechanism and sediment movement,the main effect factors to the maximum scour depth in concave bank were analyzed, the scour experiments under different conditions with analogy model of the bend channel were designed. The regression analysis was made for the experiments data with the spot measure data, the formula about maximum scour depth in concave bank with the main effect factors (flow depth, sediment size, river width, radius of the bend channel) was gained.Be tested by the spot measure data,the formula could more accurately present the practice conditions.