Construction scheme of anti-seepage geomembrane for reservoirs

　　The construction plan for the anti-seepage geomembrane of the reservoir:

　　Qualified acceptance of the lower structure - Cleaning - Transportation of geomembrane - Spreading - Cutting of membrane - Trial welding - Formal welding - Welding quality inspection (non-destructive and destructive testing) - Paving of river cloth - Prefabricated concrete blocks for pressure protection.

　　The geotextile membrane is lifted by an 8-ton transport vehicle with its own lifting facilities, and manually spread and adjust the overlap width of the weld seam (10 cm).

　　The laying shall follow the sequence of "first in the middle, then around", "first at the head of the warehouse, then at the tail of the warehouse", and "continuous construction of adjacent blocks". Avoid forming a "cross" shaped joint during laying, and the distance between "T" shaped joints should not be less than 3m.

　　In order to further improve the quality control measures for geomembrane construction and enhance the applicability of geomembrane in the hydropower industry, the following suggestions are proposed in response to the selection of reservoir anti-seepage schemes for on-site construction, as well as the initial repair and treatment of water storage

　　(1) The quality of raw materials for geomembranes is crucial for their anti-seepage effect. It is necessary to strengthen the control of raw material ingredients, online monitoring and testing during the production process of geomembranes, and strictly prohibit the addition of backfill and filling materials during the production process.

　　(2) When using geomembrane for anti-seepage in the filling area at the bottom of the reservoir, full consideration should be given to the hazards caused by uneven settlement of the filling body, especially the treatment of the joint between the geomembrane and surrounding buildings, to avoid stress concentration caused by uneven deformation and tearing the geomembrane, thereby damaging the geomembrane anti-seepage system.

　　(3) Strengthen on-site construction management and protect the finished products of the geomembrane, strictly control the construction process, and prevent artificial damage to the geomembrane during or after the construction process.