... and tailrace tunnels. The powerhouse caverns are mostly buried at a depth of 280 m~510 m horizontally and 400 m~660 m vertically. The excavation dimensions of the main powerhouse are 219.5 m in length, 29.2 m in width, and 68.7 m in height, which is one of the largest underground powerhouses with high side...

... conditions, the fault f14 are modeled in the grid in the upstream side of the tailrace surge chamber, and the lamprophyre veins is set at the down- stream side of the tailrace surge chamber. A number of weak elements are applied to model cracks and joints in the rock masses around the main powerhouse, main...

... model research works were mostly 2D, or 3D in small scale, could not simulate the underground caverns in its real meaning. displacement main powerhouse discrete principal stress surface Reservoir Characterization cavern numerical simulation geo-mechanical model test loading system rock...