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In order to form a complete and closed anti-seepage system, in addition to the sealing connection between geomembrane, the scientific connection between geomembrane and surrounding foundation or structure is also very important. If the surrounding is clay structure, the geomembrane can be bent and buried in layers, and the clay can be compacted in layers to closely combine the geomembrane and clay. After careful construction, there is generally no contact seepage between the two. In actual projects, it is often encountered that geomembrane is connected with rigid concrete structures such as spillway and anti-seepage wall. At this time, the connection design of geomembrane needs to consider the deformation adaptability and contact leakage of geomembrane at the same time, that is, it is necessary to reserve deformation space and ensure close connection with the surrounding.
Deformation adaptability and contact leakage of Geomembrane
Design of connection between geomembrane and surrounding anti leakage
Two points need to be noted: the turning point at the top of the geomembrane should gradually transition to smoothly absorb the non-conforming deformation between the settlement of the geomembrane and the surrounding concrete structure under the action of water pressure. In actual operation, the geomembrane will not be able to expand, and even crush and destroy the vertical section; In addition, no channel steel is embedded at the anchorage of the concrete structure, which is easy to form contact seepage, because the diameter of water molecules is about 10-4 μ m. It is easy to pass through small gaps. The design water pressure test of geomembrane connection shows that even if rubber gasket, densified bolt or increased bolt force are used on the concrete surface that looks flat to the naked eye, contact leakage may still occur under the action of high-pressure water head. When the geomembrane is directly connected with the concrete structure, the contact leakage at the peripheral connection can be effectively avoided or controlled by brushing primer and setting gaskets.