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Technical Requirements for Construction of Geomembrane Anti-seepage System in Landfill

1. The bottom of the landfill reservoir area should be leveled with a grader, leveled by a leveler, cleaned and leveled manually, and compacted tightly. Weeds, stones, debris and surface soil in the site should be completely removed. If deep roots of plants are found at the bottom of the cleaned field, they should be removed manually.

2. Silt clay should be used for filling soil as much as possible, and compacted layer by layer, and the compaction density should not be lower than 0.95. The particle size of the backfill. The degree of uniformity and chemical compatibility should be approved by the supervision engineer. Excessive calcium cannot be used as backfill soil.

3. For rock areas with large corners, the rock area should be treated and smoothed before the geomembrane is laid, and then smoothed with cement mortar.

4. At the bottom of the tank, first use a hammer to nail the small square wood (the small square wood is 5cm long, 2 ㎝ × 2 ㎝ square), the distance between the small square wood is 5m, plum blossom, and the level of the bottom of the groove is +20 ㎝ The elevation line is engraved on the small square wood. The foreman himself checks the elevation of the bottom of the trough, shovels it by hand at the high level, and sifts the planted soil at the lower level to the design level. After the pressure is exhausted with a 12t roller, the design requirements are met through sampling tests. The base surface must be flat, without cracks, no obvious spikes and depressions, and its flatness changes gently within the allowed range. The slope is uniform and the slope direction is consistent. Meet the drawing requirements. For the slope of the foundation pit, according to the plane size of the drawing, nail small wooden hanging lines at the lower and upper ends of the pit bottom, hang the line every 10 to 15m, and smooth the slope according to the line. A smooth transition radius <10cm, no bricks, and stones on the slope surface, no hard particles, no branches, no weeds, etc. The entire foundation pit surface will pass the acceptance test before proceeding to the next process.

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