The anti-seepage geomembrane
placed on the upstream surface of the dam at the initial stage will generate resistance along the slope of the upstream surface of the dam under the action of the slag body, and it will increase with the increase from the initial height of the dam. higher. When the tensile force of the waterproof membrane exceeds the allowable tensile strength, it will cause the waterproof membrane to tear, so the initial dam height should be limited.
The reliability analysis model of the anti-seepage geomembrane of the anti-seepage slag field uses the initial height of the dam as a variable, which varies within the range of 5-40m, with a tolerance of 5m, and the initial slope ratio is 1:1.85 higher than that of the dam. The overall slope ratio is 1.3.5; the structure of the entire reservoir filter control system is 2.0mm thick single-sided rough HDPE film (rough side down) + 600g/m2 geotextile + 60cm thick clay cushion.
When the laying height of the waterproofing membrane exceeds 15m, the tensile stress of the waterproofing membrane is higher than the allowable tensile stress (21.20kN/m), and the waterproofing membrane will be damaged. Therefore, when the initial height of the dam is greater than 15m, an anchor platform should be added on the upstream surface to reduce the tensile stress of the waterproof membrane. According to analysis, the strength of the anti-seepage geomembrane is a factor that affects the initial height of the dam, but it is not a key factor that determines the initial height of the dam, and can be solved by engineering measures.