详细内容：
![1-200922120S1456[1].jpg](/static/upload/image/20201016/1602839401623856.jpg "1602839401623856.jpg")
Overall, the watershed around the reservoir is relatively thin (especially on the south and north banks), and faults and joints are densely developed in the rock mass, forming a good infiltration network. The groundwater level around the reservoir and the burial depth of the relatively impermeable roof layer are lower than the normal water level of the reservoir. After the reservoir is filled with water, the water in the reservoir will leak out of the reservoir through the watershed. Meanwhile, due to the development of small faults, it is easy to form concentrated channels for the seepage of reservoir water, and there is a possibility of seepage deformation along them. In addition, the rainwater collection area of the reservoir is small, and the natural water inflow is also small. Therefore, the anti-seepage requirements for the upstream basin of the reservoir of the energy storage power station are relatively high. Therefore, the upper reservoir needs to undergo full basin anti-seepage treatment. A seepage prevention scheme is proposed, which includes "anti-seepage of concrete panels around the reservoir and anti-seepage of flexible materials on the surface after excavation and filling of the reservoir bottom".
Anti-seepage materials should have a strong ability to adapt to uneven deformation
Due to the significant variation in the thickness of the fill material in low-lying areas (1.5 to 75 meters thick), the uneven settlement and deformation caused by the anti-seepage system at the bottom of the reservoir are considerable. Therefore, the anti-seepage material should have a strong ability to adapt to uneven deformation. Thus, flexible materials should be used for anti-seepage. Therefore, the anti-seepage design and construction quality at the bottom of the reservoir have become one of the key factors affecting the safe operation of this project
Based on the collection of relevant engineering data at home and abroad and the reference of related experience, in accordance with the topography and engineering geological conditions of the upper reservoir of this project, it is considered to reduce the dead storage capacity of the upper reservoir and the large amount of waste residue, shorten the initial water storage time of the reservoir, lower the difficulty of construction and operation and maintenance, reduce operation and maintenance costs, and save project investment, etc. In the early design stage, multiple scheme studies, comparisons, theoretical analyses and scientific experiments were conducted on the anti-seepage of the reservoir bank and bottom. After technical and economic comparisons, it is ultimately recommended that "concrete be used for the reservoir bank and the dam body."