Located in Gejiu City and Mengzi County, Lvshui River is a first-class tributary of the north bank of the Red River, with a total length of 33.7 kilometers, and joins the Red River near Man Consumption. The karst phenomenon in the basin is remarkable, and the karst funnel in the water source area is very developed. After the rainwater flows into the karst channel through the funnel, it flows out of the surface in the form of spring water and is injected into the river. Lvshuihe Hydropower Station is developed by using the drop of more than 300 meters downstream of the Lvshuihe River.
Lvshuihe Hydropower Station is a diversion type development, with the dam site controlling the basin area of 556km2, the average annual flow of 20.22m3/s, the normal water level of the reservoir of 477m and the dead water level of 469 m; The total storage capacity is 26.5 1× 104m3, and the effective storage capacity is 23.66× 104m3, which is a daily regulating reservoir. The installed capacity of the power station is 5.75× 104kW.
Hydraulic structures include: head junction, diversion tunnel, surge shaft, high-pressure steel pipe, underground powerhouse and switching station.
The first hub building includes upper dam, lower dam, spillway tunnel, right bank ditch spillway and water inlet. The main task of the upper dam is to introduce bed load into the spillway tunnel, so as to stabilize the water flow into the regulating pool (inner reservoir) and facilitate sediment deposition; The upper dam is an overflow concrete gravity dam with a maximum dam height of 13m and a crest length of 73m. The main task of the lower dam is to backwater the high water level and form a daily regulating pool; The lower dam adopts river sluice, with a maximum dam height of 23m and a dam crest length of 60m. The left bank is provided with an accident overflow weir with a length of13.46 m; The right bank is a non-overflow dam with reinforced concrete piers, and the upstream adopts concrete inclined wall to prevent seepage; Spillway with side channel on the right bank is an additional flood discharge structure to solve the problem of insufficient flood discharge capacity after the first round of regular inspection, combined with sewage discharge. Its side weir is 28 meters long and consists of high weir and low weir, which is convenient for floating and discharging.
The barrage is equipped with monitoring facilities such as vertical displacement, horizontal displacement, seepage and stress.
The alluvial layer of the lower dam of the barrage is thicker than 10m, the bedrock is mica schist, and the weathered layer is about 3m thick. The bedrock on the left bank is exposed to the ground, and the overburden on the right bank is more than 20 meters thick, with complex composition, including foothill accumulation, slope accumulation and alluvium. The composition, physical and mechanical properties and hydrogeological conditions of each layer are very different. The piedmont accumulation layer and alluvium are strongly permeable layers, and the general mechanical properties of slope accumulation layer are poor. After the first round of drilling and sampling test, the alluvium is sandy silty clay or cohesive soil gravel. Average bulk density 1.68t/m3, internal friction angle 26, cohesion 3 t/m2.
There is a landslide on the right bank of the lower dam site with a slope of about 20, and the maximum thickness of the overburden is about 30m. The upper part is piled up in the foothills with gravel loam, the lower part is loam, and the bedrock is mica schist. The landslide is about190m wide, 300m long and 560-460m high. According to the observation data of 32 years, the maximum sliding distance is 135.7cm, and the landslide is narrow at the top and wide at the bottom, with steep slope at the top and gentle slope at the bottom, which belongs to the creeping landslide. From the geological structure, displacement and deformation segmentation and development trend, landslide deformation will gradually stabilize from bottom to top; According to the observation data of large deformation of landslide, there is still a certain amount of displacement, so it is not yet possible to conclude that the landslide has stabilized.
Lvshuihe Hydropower Station started in May 1958, stopped in May 196 1, resumed work in the first quarter of June 1966, and the first unit generated electricity in June 1972+00+07.