What are the functions of composite drainage network?

Composite drainage net has unique advantages of low price, light weight, convenient maintenance and repair. So it is very popular with everyone. In fact, when in use, a composite drainage net should be laid between the foundation and the sub-base to drain the accumulated water between the foundation and the sub-base, block the capillary water, and effectively integrate it into the edge drainage system . This structure automatically shortens the drainage path of the foundation, so its drainage time is greatly shortened, and it can reduce the use of selected foundation materials (ie, finer and less permeable materials can be used). It can prolong the service life of the road. When using the composite drainage network, we also need to know that in the northern climate, laying the drainage network can help reduce the impact of frost heave. If the freezing depth is very deep, a geonet can be laid in a shallower position of the subbase as a capillary plug. In addition, granular subbases that are less prone to frost heave and extend to freezing depths often need to be replaced. The backfill soil that is prone to frost heaving can be directly filled on the drainage pipe network. In fact, it also reaches the ground baseline during operation. In this case, you will find that the system can actually be connected to a drain that brings the water table to or below this depth. This may limit the development of ice crystals, which is not necessary to limit traffic loads when ice melts in colder regions in the spring.

There are also some important aspects to the compound traffic network. For example, a drainage network laid over the sub-base prevents sub-base fines from entering the sub-base (ie, it acts as a barrier). The aggregate base layer will go to some extent into the upper part of the geonet. In this way, you will see that its composite geotechnical drainage network also has a potential role in restricting the horizontal movement of the aggregate base. In this way, its function is similar to that of geogrid reinforcement. In general, the tensile strength and stiffness of composite geotechnical drainage grids are superior to many geogrids used for foundation reinforcement. This restraint will increase the bearing capacity of the foundation. In addition, it is important to note that after the road ages and cracks form, most of the rainwater will enter the road section.

In this case, the drainage mesh is laid directly under the road surface instead of the drainage foundation. At this point, its drainage network can collect water before it enters the foundation/sub-base. Additionally, a film can be wrapped around the bottom of the drainage network to further prevent moisture from entering the foundation. Therefore, in this case, for a rigid road system, this structure allows the road to be designed with a higher drainage coefficient CD. Another advantage of this structure is that it allows the concrete to hydrate more evenly (research into the extent of this advantage is ongoing). Whether it is a rigid road or a flexible road system, this structure can extend the service life of the road. To sum up, you will find that the composite drainage network actually works. Well, that's all for the knowledge points first, and we will bring more exciting content in the next issue. Welcome everyone to come here for field trips.