Key Construction Points for Steel-Plastic Geogrid

Construction Site

The site must be compacted, flattened and level, with all sharp protrusions removed.

Geogrid Laying

Install the geogrid on compacted and level ground. Its main stress-bearing direction (longitudinal direction) shall be perpendicular to the embankment axis. Lay the geogrid flat, wrinkle-free and fully tensioned. Secure it with fixing pins and earth-rock ballast. Where possible, use continuous geogrid strips without joints along the main stress direction. Adjacent strips shall be connected by manual lapping, with a lap width complying with design requirements. For multi-layer installation, stagger the joints between layers. After large-area laying, adjust the overall flatness of the geogrid.

Once the first layer of fill soil is placed and before compaction, re-tension the geogrid evenly by hand or machinery to keep it taut for effective stress bearing within the soil.

Fill Material Selection

Select fill materials in accordance with design specifications. Most soils are applicable except frozen soil, swamp soil, domestic waste, chalk soil and diatomaceous earth. Gravel and sandy soils are preferred for their stable mechanical properties and low sensitivity to moisture content. Control the particle size and gradation of fill materials to meet compaction standards.

Fill Spreading and Compaction

Cover the laid geogrid with fill soil promptly. Its exposure time shall not exceed 48 hours. A parallel operation of laying and backfilling is also recommended. Spread fill at both ends first to fix the geogrid, then proceed towards the middle. Compact from both sides towards the center. Avoid direct contact between compaction rollers and the geogrid. No vehicles shall travel on uncompacted reinforced soil to prevent displacement of the reinforcement. Complete layered compaction to the specified degree, which is critical to the success of reinforced soil projects.

Waterproof and Drainage Measures

For reinforced soil works, implement proper drainage systems inside and outside the retaining structure and install toe protection against scouring. Equip the soil mass with filtration and drainage facilities, and arrange geotextiles as required on site.

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