通过对有关资料的统计分析 ,提出了钢管静水压力、水锤压力、地下埋管围岩承载率、坝后背管抗力计算模式等的统计参数和概率分布类型 ,可供水电站压力钢管可靠度分析和确定分项系数时参考 Based on the statistical analysis of relevant data, the statistical parameters and probability distribution types of hydrostatic pressure of steel pipe, water hammer pressure, bearing capacity of surrounding rock buried pipe, and calculation mode of back pipe resistance of dam are put forward. The reliability analysis of penstock of hydropower station And determine the sub-coefficient when the reference