Abstract
A certain hydropower station is a concrete face rockfill dam, with the dam height of 219 m. Because of various reasons, Composite geomembrane was added on the concrete face below the elevation of 382 m. A combined impermeable system composed of composite geomememes and concrete panels is formed. This paper introduces the impermeable scheme of composite geomemmembrane, the impermeable silo design, the design of cross joint, the laying and fixing of geomemmembrane and the sealing and welding of geomemmembrane as well as its quality control and quality test and so on. The above achievements have accumulated experience for the application of composite geomememes in the anti-seepage technology of high dam.
Highlights
The total reservoir capacity of the hydropower station is 1.366 billion m3, which is a first-class type project with many years of regulating performance
A composite geomembrane was added to the middle and lower face plates of the dam
In order to improve the anti-seepage effect of the joint, the composite geomembrane is extended to the top of the dam for the peripheral joints and the vertical joints of the slab with an elevation above 382.0 m
Summary
The total reservoir capacity of the hydropower station is 1.366 billion m3, which is a first-class type project with many years of regulating performance. The total installed capacity is 450 MW. The average power generation over the years is 964 million kWꞏh. The project was closed by the river in December 2008, and the dam body was filled up to an elevation of 375.000 m in October 2011. By December 2018, the dam was filled to an elevation of 465.00 m. It is planned in november 2019, the gate was closed for water storage. The dam anti-seepage slab was poured in three phases, the top elevation of the first phase is 360.00 m, the second phase is 430.00 m.
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