Pumped storage upper reservoir dry-wet cycle lower thermal insulation anti-seepage reservoir bank structure and construction method thereof

Abstract

The invention discloses a pumped storage upper reservoir dry-wet cycle lower heat preservation anti-seepage reservoir bank structure and a construction method thereof. The structure is sequentially provided with a broken stone hardcore, a leveling cementing layer, an asphalt stabilized broken stone drainage layer, a polyester grid, a fiber-doped asphalt concrete layer, a heat preservation layer and a mastic sealing layer from inside to outside on the upstream side of the slope surface of a bank slope. The leveling cementing layer is made of an asphalt concrete mixture, and the porosity of the leveling cementing layer is 10%-15%. The asphalt stabilized macadam drainage layer is made of an asphalt macadam mixture, and the porosity of the asphalt stabilized macadam drainage layer is 15%-25%. The fiber-doped concrete is adopted, the defects of a traditional asphalt concrete panel anti-seepage technology are overcome, the heat preservation layer is additionally arranged on the basis, and the problem that due to frequent water level fluctuation of an upper reservoir, the panel is prone to cracking due to dryness, wetness and temperature changes is effectively solved.

Description

technical field [0001] The invention relates to the technical field of anti-seepage of pumped-storage reservoirs, in particular to a heat-insulating anti-seepage reservoir bank structure and a construction method thereof under the dry-wet cycle of a pumped-storage upper reservoir. Background technique [0002] The pumped storage power station is a hydropower station that uses the electric energy when the power load is low to pump water to the upper reservoir, and then discharges water to the lower reservoir to generate electricity during the peak period of the power load. Anti-seepage is the key to the success of the project. [0003] At present, there have been many research results on how to carry out the anti-seepage treatment of the upper reservoir bank. Generally speaking, several forms such as reinforced concrete, geomembrane, clay, and asphalt concrete panels and their combinations are mainly used, but there are certain problems. . Although the reinforced concrete s...

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Problems solved by technology

Although the reinforced concrete slab has better anti-seepage effect, it has large investment, slow construction speed, and poor deformation ability; geomembrane anti-seepage adaptability is strong, low cost, but the construction is more complicated, easy to aging, and short life; clay anti-seepage The construction is simple and the cost is low, but the low shear resistance is prone to settlement deformation, and even the soil cracks affect the structural safety; the asphalt concrete panel has a good anti-seepage effect, has a strong ability to adapt to the deformation of the foundation, and has no joints to coordinate with the surrounding environment, and the construction speed Fast, the defect can be repaired quickly, and the water can be stored 24 hours after the repair, but the investment is large and the construction process is complicated. At the same time, the connection between the asphalt concrete panel and the surrounding concrete buildings is a major difficulty

The above-mentioned forms all have certain beneficial effects on the anti-seepage of the reservoir bank, but they do not consider the influence of the dry-wet cycle and the temperature difference change of the pumped storage reservoir.

[0004] The water level of the pumped storage reservoir fluctuates frequently, and the deterioration of the soil under the dry-wet cycle causes large settlement deformation and cracks

In addition, there is also a cycle of temperature rise and fall on the surface of the reservoir bank, which may cause cracks in the surface layer of the reservoir bank

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