通过外福铁路线水口水库库岸的坍岸观测研究 ,提出适合我国南方山区峡谷型水库坍岸的预测方法———“两段法”及其适用范围 ,给出各参数的确定方法及操作步骤。该法在外福线坍岸预测及岸坡防护的成功应用 ,可供类似的库岸工程设计参考 Based on the observation and research on collapse bank of Shuikou reservoir bank of Waifu-Fuzhou Railway Line, this paper puts forward the forecasting method suitable for the bank collapse of the gorge reservoir in the southern mountainous area of ​​China - “Two-stage Method” and its applicable scope, and gives the method of determining each parameter and its operation step. This method has been successfully applied in the prediction of bank collapse of the Fukien line and the protection of bank protection and can be used for reference of similar bank engineering design