This paper has introduced application of the thin concrete structure with practical project and has expounded the measure of reinforce handing for seepage prevention with geosynthetic in dam, and has gained a well economic and society benefit.

Seepage and its effect on dam slope stability in Wuling Hydraulic project;

Water level in small flood control in combination with irrigotion reservoir changes frequently,especially during irrigation period,the reservoir water level drops significantly,which would affect the dam slope stability.

Based on the dam slope stability calculation conducted for a high core wall type rockfill dam with linear strength index and nonlinear strength index respectively,the authors discuss the difference of the calculation results.

At present,it is not perfect to analyze the slope stability of rockfill dam only using traditional safety factors method.

It is indicated by calculation of seepage flow and analysis of slope stability that the tailing pond can meet the environmental protection requirement after the control and reinforcing measures are taken in design.

In addition the influences of nonlinear strength parameters φ0 and Δφ on slope stability were researched.