Seepage Analysis And Seepage Contrd Design In Goupitan Hydropower Station Underground Powerhouse

At present, hydroelectric projects tend to be extensive scale with large power per unit, longspan underground caverns, large-scale excavation for caverns.Goupitan hydropower station, which is under construction , is the greatest hydropower station in Guizhou. It has large-scale underground powerhouse caverns with 5×600MW installed capacity. The main generator room, the main transformer room and the tailrace surge room are located sequentially from the upstream to downstream, with the size (length × width × height) of 230.45m × 27m × 73.32m, 207.1m × 15.8m × 21.34m, 158m × 19.3m × 110.24m.As to the large-scale underground powerhouse caverns, not only the stability of surrounding rock mass of underground caverns under excavation needs to be solved, but also it is ensured that the underground powerhouse will be running safely all the time. The research on the stability of the large-scale underground power-house cavern is a key issue to be solved immediately in engineering fields and academe.Seepage of rock cave needs to be considered seriously during the course of cutting and runnig for underground caverns, especially, the influence of rock cave seepage to stability of underground power-house caverns under high head to be considered more seriously after reservoir filling. Domestic and overseas scholars all agree that rock's seepage field and stress field affect each other. Their interaction affects the stability of surrounding rock mass of underground caverns. Hence, analysis on seepage and seepage-control for cranny rocks is the main content of large-scale underground caverns. The complexity of geological structure, medium feature and mechanics feature makes analysis on seepage of underground caverns be up to the simulation degree and precision of parameter related.Surrounding rock mass of Goupitan Hydropower stantion underground cavers mainly consists of limestone, karst and crack develops well and the water permeability of the rock body have the obvious quality anisotropism characteristic.The conservation storage of the reservoir will change the hydrology geological condition of original mountain body groundwater, have a certain effect on the stability of surrounding rock of underground powerhouse caverns and influence the daily working of the underground factory building too. So resolving seepage of...