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Geotextile tube bags are large tubular permeable structures made of high-strength geosynthetic materials (usually polypropylene monofilament, split film yarn, or filament) through weaving, cutting, and sewing-2. They constitute a "hydraulic filling and mud-water separation" system, which achieves the separation of solid particles from water by filling the bag with mud or mortar and utilizing the filtering function of the bag's fabric-4.

Geotextile pipe bags belong to a type of geotextile wrapping system. Different from conventional small geotextile bags (mainly used for slope protection and retaining walls), their notable features include large diameter (circumference up to 30m), long size (up to over 60m), and high filling pressure. They are mainly used in large-scale dredged silt treatment, cofferdam construction, and environmental engineering fields

1. Core material

The base material of geotextile tubes is primarily woven from high-tensile polypropylene (PP) yarn, with some products also utilizing polyethylene terephthalate (PET) or nylon (PA). To meet the requirements for long-term service underwater and outdoors, UV stabilizers, antioxidants, and carbon black masterbatch are added to the material to ensure its durability in harsh environments

2. Functional principle

The core technical mechanism of geotextile tube bags is based on a three-stage physical process: filtration, dewatering, and consolidation

Hydraulic filling and flocculation: Mix dredged slurry with a high molecular weight flocculant (such as polyacrylamide PAM) in a pipeline to cause the tiny suspended particles in the slurry to aggregate into large flocculated clusters.

Permeable solid-liquid separation: After filling the slurry into the tubular bag, the fluid pressure inside the bag increases. Under the influence of pressure, water molecules seep out of the tube through the tiny pores formed by the fabric weave, while solid particles (sediment, pollutants) are retained inside the bag.

Dehydration and consolidation: As water continues to be discharged, the solids inside the bag gradually become denser and consolidated. Under the influence of gravity and subsequent surcharge pressure, the volume of sludge can be reduced by more than 90%, ultimately forming a transportable and usable soil mass