Geotextile is a kind of permeable geosynthetic material produced by weaving technology, which is also called geotextile. Geotextile is a kind of engineering cloth, which is widely used. Generally, geotextile is mostly white, and the worse the color is, the worse the quality is. The following are the functions of geotextiles:

1: Isolation: the construction materials (such as soil and sand, soil and concrete) with different physical properties (particle size, distribution, consistency and density) are isolated by using polyester staple fiber needle punched geotextile. Make two or more materials not to be lost or mixed, maintain the overall structure and function of materials, and strengthen the carrying capacity of structures.

2: Filtration (reverse filtration): when the water flows from the fine soil layer to the coarse soil layer, the polyester short fiber needle punched geotextile has good permeability and water permeability, which makes the water flow through, and effectively intercepts the soil particles, fine sand, small stone, etc., so as to maintain the stability of the water and soil engineering.

3: Drainage: polyester staple fiber needled geotextile has good water conductivity, which can form drainage channels inside the soil, and discharge the excess liquid and gas in the soil structure.

4: Reinforcement: polyester staple fiber needle punched geotextile is used to enhance the tensile strength and deformation resistance of the soil, enhance the stability of the building structure, and improve the quality of the soil.

5: Protection: when the water flow scours the soil, it can effectively diffuse, transfer or decompose the concentrated stress, prevent the soil from being damaged by the external force, and protect the soil.

6: Anti puncture: combined with geomembrane, it becomes a composite waterproof and anti-seepage material, which plays the role of anti puncture.