桥梁墩台一般冲刷评价方法的改进与应用

基于防洪影响评价和桥梁安全角度对桥梁墩台的一般冲刷进行分析比较,提出防洪评价计算中束窄河床冲刷的概念.利用水动力学泥沙数学模型对束窄河床冲刷进行了量化分析,以冲刷影响系数β来描述桥梁墩台束窄河床对河道冲刷的影响程度,以冲刷影响深度Hβ来描述其对河道冲刷深度的影响,对防洪影响评价中稳定河床一般冲刷计算进行了补充完善.最后利用提出的方法对4个桥梁工程进行了冲刷计算与相关评价,认为提出的束窄河床冲刷影响系数β和冲刷影响深度Hβ可对现行防洪评价有一定的改进.

The Improvement and Application of Evaluation Methods in Bridge Pier General Erosion

Based on Analyzing and comparing the general erosion of the bridge pier and abutment from the point of views both evaluation of flood control and bridge safety, the concept of narrowded ri- verbed erosion is proposed in calculating of flood control evaluation. By the method of hydrodynamic sediment mathematical model, quantitatively analyse narrowed riverbed scour, there both use the ero- sion influence coefficient to describe the degree of the bridge pier narrowed riverbed influence of river erosion and use the erosion affect of depth to describe the scour of the fiver to supplement and im- prove general erosion calculation of the stabilized riverbed in the flood impact assessment. Finally, use the proposed method to evaluate the erosion of four bridge engineering, thinking that the influ- ence coefficient and the erosion affect depth of narrowed riverbed erosion can certainly improve to the existing flood control evaluation.