The composite drainage network (also known as three-dimensional geotextile drainage board, tunnel drainage water board, or drainage water board) is composed of a three-dimensional structure of plastic mesh double-sided bonded with permeable geotextile fabric. It can replace traditional sand and gravel layers and is mainly used for drainage in landfills, roadbeds, and tunnel walls.

Composite drainage network is a new type of geotechnical material for drainage. Made from high-density polyethylene (HDPE) as raw material and processed through a special extrusion molding process, it has a three-layer special structure. The middle reinforcement has high rigidity and is arranged longitudinally to form a drainage channel. The cross arranged reinforcement forms a support to prevent the geotextile from being embedded in the drainage channel, and can maintain high drainage performance even under high loads. Double sided adhesive permeable geotextile composite use, with comprehensive performance of "filtration drainage breathability protection", is currently an ideal drainage material.

characteristic:

1. Laying between the foundation and base, used to drain accumulated water between the foundation and base, block capillary water, and effectively integrate into the edge drainage system. This structure automatically shortens the drainage path of the foundation, greatly reduces the drainage time, and can also reduce the amount of selected foundation materials used (i.e., materials with more fine materials and lower permeability can be used). It can extend the service life of roads.

2. Laying a drainage network on the subgrade layer can prevent fine materials from entering the subgrade layer (i.e. serve as a barrier). The aggregate base layer will enter the upper part of the geonet to a limited extent. In this way, the composite geotextile drainage network also has a potential function of restricting the lateral movement of the aggregate base layer, similar to the reinforcement effect of geogrids. Generally speaking, the tensile strength and rigidity of composite geotextile drainage networks are superior to many geogrids used for foundation reinforcement, and this limiting effect will enhance the support capacity of the foundation.