Which friend has an introduction of Baise Hydropower Station?

Baise water control project is located on Youjiang River in the upper reaches of Yujiang River in Guangxi, and the dam site is 22 kilometers upstream of Baise River. The development and management of Yujiang River is a key project with flood control as its main task.

Large-scale water conservancy projects that comprehensively utilize the benefits of power generation, irrigation, shipping and water supply.

Rainwater collection area above dam site 19600km2, accounting for 47.6% of Youjiang River basin area, with an average runoff of 8.23 billion m3 for many years. The normal water level of the reservoir is 228 meters, and the corresponding storage capacity is 4.8 billion cubic meters. The reservoir water level corresponding to the possible maximum flood is 233.73 meters, and the corresponding reservoir capacity is 5.6 billion cubic meters. The dead water level is 203m, and the dead storage capacity is 21.800 million m3. The reservoir has a storage capacity of 2.62 billion m3, with a storage coefficient of 0.3 16. It is an incomplete multi-year reservoir. The limited flood control water level is 2 14m, and the corresponding flood control storage capacity is10.64 billion m3. After the completion of the project, the flood control capacity of Nanning can be improved from once every 20 years to once every 50 years, and that of Yujiang can be improved from once every 10 to once every 20 years, and that of Youjiang can reach once every 50 years, protecting1873,000 population and 72,800 hectares of cultivated land. . The installed capacity of the hydropower station is 540,000 kilowatts, the average annual power generation is 65.438+0.69 billion kilowatt hours, the annual utilization hour is 36.5438+0.30 hours, and the guaranteed output is 65.438+0.23 million kilowatts. Through the regulation of Baise Reservoir, supplemented by waterway regulation, the navigation channel from Baise to Tiandong can reach 500tt-class ships, reaching the fifth navigation standard, and the navigation channel from Tiandong to Nanning can reach the fourth navigation standard.

The river section where the dam site of the main dam is located is an open V-shaped inclined valley with a river width of 50 ~140 m. The topography on the left bank is relatively complete, and the topography on the right bank is relatively flat, with broken rocks. The dam site is hard diabase, siliceous rocks and limestone are medium hard rocks or broken hard rocks, and mudstone is weak. On the basis of alternating soft and hard, the dam site increases the complexity of dam construction. The overall layout of Baise Water Control Project is divided into two parts: the main dam area and navigation structure, with two auxiliary dams. The hub is constructed in two phases, the first phase has a main dam area and two auxiliary dams, and the second phase is navigation structure. The main buildings in the main dam area include the main dam, underground power station, corresponding water diversion system and underground booster station, as shown in the figure.

Baise main dam is a full-face RCC gravity dam with a crest elevation of 234m, a maximum crest height of 130m, a crest length of 700m and a crest width of10m. . The upstream slope is divided into two grades, the elevation below 142m is 1∶0.2, and the elevation above 142m is vertical; The downstream gradient is 1∶0.75 (the overflow dam section is 1∶0.7). The maximum dam bottom width is103.9m. The dam body is divided into 23 dam blocks by 22 transverse joints without longitudinal joints, with the maximum width of 36m and the minimum width of 22m, generally about 30m. The overflow dam is located on the left side of the river center and is 88m long. There is a four-hole surface overflow dam of 14m× 18m, and the crest elevation is 2 10m. The combined energy dissipation mode of "wide tail pier, middle hole bucket and underflow stilling basin" is adopted. The upstream foundation of stilling basin is diabase, and the downstream is built on soft rock, with foundation anchor and drainage facilities. Length123.6m, depth15m. There are three middle holes in the waterless area below the three middle piers, the orifice is 4m×7m, and the elevation of the inlet sill is167.5m.

The two auxiliary dams are far away from the dam area. Yintun auxiliary dam is located on the watershed about 5km east of the main dam area. The dam foundation is mudstone and sandstone of Bai Peng Formation of Middle Triassic, and the fully weathered thickness is about 25m. The dam type is a mixed core rockfill dam with a crest elevation of 235m, a maximum dam height of 50m, a crest length of 375m and a crest width of 7 m.. Xiangtun auxiliary dam is located in the northeast of the main dam.

At another watershed of 4.8km, the stratum is the same as that of Yintun auxiliary dam, and the dam type is homogeneous earth dam. The maximum dam is 30m high, the crest is 96m long and 7m wide, and there is a diversion irrigation tunnel at the left dam head.

Baise hydropower station is underground, located in diabase downstream of left dam head, and its tower inlet is located on the left bank upstream of the dam, and its foundation is mudstone and siliceous rock.

The water surface elevation is 177m, the water inlet bottom elevation is 179m, the tower is 59m high, 82m wide and 24m long, with four 5. 1m×6.5m quick gates and 1 access doors, which are connected to the left bank highway through a 50m-long working bridge. One machine and one hole for water diversion. The reinforced concrete pressure diversion tunnel has an inner diameter of 6.5m, a lower flat section of 45m, a steel lining, and the longest tunnel of 1 is 284m without surge shaft. Limited by the thickness of diabase, the axis of the main powerhouse cavern of hydropower station is almost parallel to the strike of rock strata. The main powerhouse tunnel is 20m wide and 50m high, with a total length of 123m. Among them, four 13.5kW hydro-generator sets are installed, and a traffic tunnel is connected with the highway with the downstream elevation of 137m. The tailrace gate chamber is arranged in combination with the underground booster station. The size of the underground booster station is19.2m× 26m (width× height). The cavern is parallel to the main powerhouse with a clear distance of 20.6 meters, and is equipped with a tailrace gate chamber, a main transformer layer, a cable corridor layer and a fully enclosed high-voltage switchgear layer. The tailrace tunnel consists of four branch tunnels with a width of 8m and a height of 9.3m and a tunnel with a width of 1 strip 13m. The main tunnel is 25m high, and the bottom elevation of tailrace channel is 1 17m.

The entrance of Baise navigation structure is located in Yintungou, 3.3km away from the main dam area on the left bank of the reservoir, and enters Youjiang River 7km downstream of the main dam through Nalugou, with a total length.

4338m, equipped with 2×300t two-stage ship lift, with the maximum lifting height of 1 15m, in which the first stage is 25m and the second stage is 90m.

The construction diversion adopts tunnel diversion method in dry season, and the design standard is1100-year flood from mid-October to mid-May of the following year 10. The design flow of diversion is

1390 m3/s. In flood season, the diversion method combining overflow cofferdam and tunnel is adopted. The maximum flow of the tunnel is 2002m3/s, the tunnel length is 828m, the cross section is circular, and the diameter is13.2m. ..

The main civil engineering quantity of the hub is: total earthwork 1 1.77 million m3, of which the first phase is 5.24 million m3 (including 300,000 m3 of rock excavation); The total amount of concrete is 30 1 000 m3, of which the first phase is 2.78 million m3 (including 2 million m3 of RCC); The static investment of the project is 4.93 billion yuan, of which the first phase is 4.2 billion yuan; The dynamic investment of the project is 7.78 billion yuan, of which the first phase is 6.56 billion yuan. The reservoir flooded 45,638 mu of cultivated land, and the immigrant population was 23 140.

The survey and design of the main dam, hydropower station and Guangxi resettlement project of Baise Water Control Project shall be undertaken by Guangxi Water Conservancy and Electric Power Survey and Design Institute.

The survey and design of the resettlement projects of the auxiliary dam, navigation structure and Yunnan Province shall be undertaken by the Design Institute of the Pearl River Water Conservancy Commission. The main project is constructed in two phases, the first phase

Including main dam, auxiliary dam, hydropower station, resettlement and navigation structure reservoir area; The second phase of the project is the navigation structure. Construction preparation of "four links and one leveling" in main dam area

1999 completed the construction, 1999+0 1 started the diversion tunnel and the highway in the dam area. The first phase of the main project started in 2000, with a total construction period of 6 years. The project is funded by the Guangxi District Government and the Ministry of Water Resources, with a loan of 400 million dollars from the World Bank. The owner is Guangxi Youjiang Water Resources Development Co., Ltd.