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Eguchi Hydropower Station is a comprehensive utilization project mainly to generate electricity, and cascade development of Furongjiang main stream of the next level, the project location away from the electricity load centers in Chongqing city about 130km, dam site control a drainage area of ??7940km 2 years average flow 152m ~ 3 / s, multi-year average runoff 4.79 billion m to 3 reservoir normal water level is 300m and a total capacity of 497 000 000 m to the power station installed capacity of 300MW, the hub works are Ⅱ other projects. The first unit of the project grid was in December 2002 and the third unit was in October 2003, and the grid. Eguchi underground plant system from the main plant and auxiliary plant busbar hole, main transformer switch room, high voltage cable hole qualifying well, qualifying field, exhaust and Chief slag hole for Access Tunnel drainage gallery. Main and auxiliary plant full-length 103.25m, width 19.20m, 51.20m (highest point). Factory layout of three 100MW hydroelectric generating units. Main plant upstream sidewall, the The three internal diameter of 5.6m high pressure diversion manifold, the vertical plant axis into the plant spacing 17.50m. Downstream sidewall (busbar hole about 16m) diameter 5.02m tailrace manifold positive water the underground powerhouse depth of about 120m below the limestone and dolomite blocks the body, the entire caverns located fracture geological structure less alteration in block. The downstream side of the main transformer caverns are arranged in parallel in the main plant. Main plant main transformer hole parallel to the clear distance 28m, main transformer switch room 72.20m, width of 14.20m, 25.60m. Qualify well 113.50m, an inner diameter of 9m, connected to the ground 220kV outgoing field. Arranged three busbar hole between the main plant and the main transformer hole in elevation 186.95m, the cross section of 5.90m × 6.75m 17.50m Horseshoe type, pitch. Each unit bus connected through the respective busbar hole with the main transformer. The top arch at the right end of the two parallel cavern has exhaust and Chief slag hole section 8 × 6.5m. About 10m around away from the two main cavern sidewall has a cross-section of the upper and lower levels of 2.5 × 3m drainage gallery. In this paper, Jiangkou Power Station, from the perspective of engineering the underground powerhouse design principles, the design focus are discussed in detail, on the choice of the way of the power station development, the layout of the underground caverns of the characteristics of surrounding rock stability analysis and support options The rock bolt crane girder design method put forward their own views. The views and conclusions of this paper has a certain universal significance of the underground plant engineering design.
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