二滩大坝表孔跌流和中孔挑流的冲刷风险分析

The Risk Analysis of the Erosion Below Dam of Er Tan Engineering

本文应用风险分析的观点分析了二滩工程表孔跌流和中孔挑流对坝基的冲刷分析。由分析结果可知,从风险和经济两方面看来,二滩大坝应用坝下水垫塘保护大坝安全是必要的。二滩工程是国内第一家应用风险分析讨论坝下防冲问题的工程,其结果无疑对工程设计有科学的定量的参考价值和重要意义。

The erosion risk below dam that the flood relief of the spillway and the deep hole of Er Tan engineering bring about is analysed by risk analysis theory. According to the analysis results, it is imperative that the stilling basin below dam is applied to protect dam base from erosion. From the view of risk and economy, the Er Tan engineering design scheme that it is applied the stilling basin below dam is coincidence with safe and economic role, it is resonable and scientific. The erosion risk analysis method suggested by the paper can be applied to other engineering,the results are certainly of reference value and guidance significance for engineering design.