The geologic conditions,characteristics and causes about the deformation failure of the tunnel-face side slope of the diversion tunnel in Siping Hydropower Station in Hubei Province are discussed particularly.

This paper gives a scientific analysis of many factors which influence water tunnel slope stability, being on the basisi of geological research and water tunnel slope investigation.

3D elastoplastic finite element simulation on excavation and reinforcement of the diversion tunnel outlet slope at the left bank of Jinping-I Hydropower Project;