Abstract:

Wendeng pumped-storage power station is composed of water intake system, underground powerhouse system, tailrace system and the upper and lower reservoir. The underground chambers, seepage control system of the upper and lower dam, and the adits and densely distributed drainage holes above the penstock construct the complex impervious system of the station. GWSS(Groundwater Simulation System) software was adopted in the numerical simulation analysis on the complex seepage field of the project. Characteristics of the complex seepage field, the external water pressure of conduit pipe and the impervious effect of the upper dam during normal operation were investigated. The result shows that the pressure on the conduit pipe and branch pipe can be reduced obviously and hence the seepage control effect meets the requirement by setting plughole and drainage curtain at the top of the horizontal segment of the high-pressure tunnel.

Key words: 3-D seepage field , underground tunnel , method of modified cut-off negative pressure , method of drainage substructure , FEM