| Hydraulic tunnels are widely applied in large, medium and small hydropower stations. Diversion tunnel, one kind of the hydraulic tunnel, has larger and larger cross-section and bears higher and higher water pressure in order to generate electricity early. But the present design methods and specifications can't meet the requirement of modern hydroelectric projects, for example, the diversion tunnel in Pubugou Hydropower Station, the outer water pressure born by it has exceeded more than 100m.Accordance with the practice of Pubugou Hydropower Station diversion tunnel, Elasto-plastic finite element method has been used to simulate the process from tunnel digging, supporting, operating to sealing. Some main research work and conclusions are as follow:(1) Effects on the stresses and deformation of diversion tunnel has been analysized by comparing different digging plan and the time making support. Result shows that different digging plan has some effects on the stresses of diversion tunnel but not serious.(2) Analysis on different concrete liner thickness and bearing characteristics between concrete liner and surrounding rock under high internal and outer pressure has been carried out. Some beneficial conclusion and engineering measurements are suggested.(3) Three-dimension finite element method has been used to study the stresses and displacement distribution of sluice mound under high water pressure.
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