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Composite drainage mesh is made of double-sided bonded geotextile over a three-dimensional geogrid, combining the geotextile (filtering function) and geogrid (drainage and protection function) to provide "filtering-drainage-protection" effects. The three-dimensional structure of the composite drainage mesh core can withstand high compressive loads throughout its use and maintain considerable thickness, offering excellent water permeability.

Function characteristics:
1. Laid between the subgrade and subbase, this is used to drain water between them, block capillary water, and effectively integrate into the edge drainage system. This structure automatically shortens the drainage path of the subgrade, significantly reducing drainage time, and can also reduce the amount of subgrade material used (i.e., materials with fine particles and lower permeability can be used). It can extend the service life of the road.

2. Laying a drainage mesh at the base layer can prevent fine materials from the subgrade from entering the ground layer (also serving as an isolation function). The aggregate subgrade will enter the upper part of the geotextile to a limited extent. Thus, the composite geotextile drainage mesh also has a potential function to restrict the lateral movement of the aggregate subgrade, similar to the reinforcing effect of geotextile grids. Generally speaking, the tensile strength and rigidity of the composite geotextile drainage mesh are comparable to many geotextile grids used for foundation reinforcement, and this restrictive function will enhance the supporting capacity of the foundation.

3. After road aging and crack formation, most rainwater enters the cross-section. In such cases, directly lay the drainage grid under the road surface instead of permeable subgrade. The drainage grid can collect water before it enters the subgrade/substrate. Moreover, a membrane can be wrapped at the bottom of the drainage grid to further prevent water from entering the subgrade. For rigid road systems, this structure allows for the design of roads with a higher drainage coefficient Cd. Another point of this structure is that it may enable uniform hydration of concrete (research on this point is ongoing). Regardless of rigid or flexible road systems, this structure can extend the service life of the roads.

4. Under northern climatic conditions, laying a drainage network can help alleviate the effects of frost heave. If the frost depth is significant, the geotextile can be placed at a shallower position within the subgrade, acting as a capillary action barrier. Additionally, it's often necessary to replace the granular subgrade material with one that is less prone to frost heave, extending downwards to the frost depth. The frost-heave-prone backfill soil can be placed directly above the drainage network, up to the ground surface line of the subgrade. In this case, the system can be connected to the drainage outlet, ensuring groundwater levels are at or below this depth. This can potentially limit the growth of ice crystals, and during spring thaw in cold regions, traffic loads do not need to be restricted.