With the development of large ships and the rapid economic development, some low-grade inland waterways can no longer meet the needs of cheap and large ships along the route. The water channel needs to be improved to increase the size of the water channel, including the depth, width and radius of curvature of the water channel. This also increases the frequency of use of geomembrane
Due to the large amount of earthwork dredging in river improvement, the narrow surface of inland rivers and the requirements of environmental protection and flood discharge, underwater dredging is not suitable for use. The dredged soil must be dredged and filled into the shore. When there is no loan pit or pond near the dredging channel, it is necessary to build a dredging area on the land to contain the dredged soil. The mud drainage area is mainly composed of cofferdam, water outlet, grate, etc. Due to the high water content, low resistance, slow consolidation and high viscosity of the dredged soil, the inner slope of the cofferdam uses an impermeable geomembrane, and a certain distance is extended at the top and bottom of the slope to isolate the soil. Dredging and protecting waste landfills. The dredged mud must settle in the cofferdam for a period of time. Once the soil particles in the mud settle, the water in the mud will be discharged through the water outlet. The application of geomembrane can prevent the water in the silt from entering the cofferdam, causing the cofferdam to collapse. The full-scale overlapping geomembrane on the inner side improves the integrity of the cofferdam during construction, improves safety and environmental protection, and can also prevent soil erosion.
Some engineering projects have begun to use degradable geomembrane in the cofferdam of the dump, so that after the consolidation and restoration of the dump, the laid geomembrane will decompose by itself, avoiding soil pollution and promoting its subsequent disposal. Converting land to cultivated land can increase the area of local agricultural land.
Some engineering projects are exploring the application of vacuum consolidation to accelerate the consolidation of dredged soil in drainage areas. Geosynthetics must be placed on the surface of the dredged soil to ensure its voids. In this way, the construction period can be shortened, the lease time for temporary land acquisition of landfills can be reduced, project costs can be saved, and safety hazards can be eliminated. Transport to the landfill as soon as possible, and recycle and deliver to local use as soon as possible.