Composite geomembrane is used in dam anti-seepage projects. In addition to the above general advantages, it can also mechanically improve the structural performance of the dam itself.
  1. The influence of composite geomembrane on the stress of embankments. When the soil is compressed and deformed, the composite geomembrane is a flexible material that curls up in the dam. When the dam is subjected to tensile stress, because it has high tensile strength, it can bear part of the tensile stress of the soil, thereby inhibiting the soil. body strain.
2. The influence of composite geomembrane on the vertical settlement of embankments. When considering the relative slip between the composite geomembrane and the core wall, the vertical settlement of the dam body is similar to the settlement contour distribution without the composite geomembrane. The maximum settlement is slightly smaller. The equivalent value at the composite geomembrane is The line is not continuous.
3. The influence of composite geomembrane on the horizontal displacement of the dam. The composite geomembrane adopts the contact unit mode. Due to the consideration of relative slip, the upstream dam shell moves upstream, which is larger than when there is no composite geomembrane. When the composite geomembrane adopts the line element mode, the displacement of the upstream dam shell is significantly reduced, and the horizontal displacement at the composite geomembrane is increased, indicating that the tensile strength of the composite geomembrane plays a restraining role.
4. The influence of changes in seepage field on stress. For dams with seepage conditions, there is volume permeability. After the composite geomembrane is laid, the seepage field in the dam changes, and the stress and strain in the dam body change accordingly, causing the stress to be readjusted, causing the small principal stress to change greatly. However, the change of large principal stress is small.
    The anti-seepage performance of composite geomembrane is one of the important indicators for anti-seepage engineering applications. The determination of the anti-permeability performance of the product is an anti-permeability test under the action of pressure water head. Under the specified hydraulic pressure difference, the permeability coefficient is obtained through the seepage amount and thickness of the sample within a time period. The calculation obeys Darcy's law. Composite geomembranes have much better performance than single membranes and have more functions. Composite geomembranes are easier to construct than single membranes. When holes are formed in the membrane, the single membrane will leak a lot and lose the waterproofing effect. In the composite one-layer geomembrane After the geotextile is applied, various structural mechanical indicators such as tear resistance and puncture resistance have been further improved. The membrane will not be easily damaged during transportation and construction sites. Once a hole occurs, the friction resistance of the geotextile can limit a large amount of water seepage. , ensuring common fault resolution time. The drainage function of the geotextile can also allow the permeable water or porosity water on the back of the membrane to be completely discharged, eliminating the consequences of the membrane being unbalanced due to the membrane being supported by the water and the reverse permeability force, and also improving the surface quality of the sand river pebbles. Frictional resistance ensures good contact between the membrane and the dam foundation. Most of the core wall vertical anti-seepage in my country's dam construction uses single membrane or multi-layer single membrane, and the geomembranes laid on the water surface of the inclined wall type mostly use composite geomembranes. Judging from the anti-seepage effect of dams that have adopted single membranes and the regulations on geomembrane types in SL/T225-98, single membranes have good anti-seepage effects on small reservoirs with low water heads, and are still a competitive membrane material. However, under economic conditions, composite geomembranes have good engineering properties.

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