1. It is laid between the foundation and the subbase to drain the accumulated water between the foundation and the subbase, block the capillary water and effectively integrate into the edge drainage system. This structure automatically shortens the drainage way of the foundation, greatly reduces the drainage time, and reduces the number of selected foundation materials (i.e. using materials with more fine materials and lower permeability). It can prolong the service life of the road.

2. Laying three-dimensional composite drainage network in the subbase can prevent the fine materials of subbase from entering into the subbase (that is to say, it plays an isolation role). The aggregate base will enter the upper part of the geonet to a limited extent. In this way, the composite geotechnical drainage network also has a potential role in limiting the lateral movement of aggregate base. In this way, its role is similar to the reinforcement effect of geogrid. Generally speaking, the tensile strength and rigidity of composite geogrid are better than that of many geogrids used for foundation reinforcement, which will improve the supporting capacity of foundation.

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