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   Composite drainage mesh (also known as three-dimensional geotextile drainage board, tunnel drainage board, or drainage board) is composed of a plastic mesh with a double-sided adhesive permeable geotextile. It can replace the traditional sand and gravel layers and is mainly used for drainage in landfill sites, roadbeds, and tunnel walls.

  In transportation infrastructure such as railways and highways, the safety and service life of the project are inseparably related to its own drainage system, and geosynthetic materials are an important component of the drainage system.

 Composite drainage mesh is a new type of soil engineering material for drainage. It is made of high-density polyethylene (HDPE) and processed through a special extrusion molding process, with a three-layer special structure. The middle reinforcing strips have large rigidity, are longitudinally arranged, and form drainage channels. The reinforcing strips cross-arranged at the top and bottom form support to prevent geotextiles from embedding into the drainage channels, maintaining high drainage performance even under high loads. The composite use of double-sided adhesive permeable geotextiles has a comprehensive performance of "anti-filtering - drainage - ventilation - protection", making it the most ideal drainage material at present.

 Product Usage:

  Mainly used in railway, highway, tunnel, municipal engineering, reservoir, slope protection and other drainage projects with significant effects. Product features:

 1. High drainage (equivalent to one meter thick gravel drainage).

 High tensile strength.

 3. Reduce the chance of soil fabric embedding in the mesh core to maintain long-term stable drainage.

 4. Long-term high pressure load (able to withstand approximately 3000 Ka compression load).

 5. Corrosion-resistant, acid and alkali resistant, long service life.

 6. Construction is convenient, shortens the construction period, and reduces costs.

The characteristics of three-dimensional composite drainage mesh

 1. When the load is 720kPa, the gradient is 2%, the permeability is 2500m/d, and the flow rate is 13pm/m.

 2. The creep test retained more than 60% of the thickness after 10,000 hours of loading at 1200kPa.

 3. The carbon black content in the three-rib drainage mesh core is not less than 2%, with a density of 0.94 g/cm3, a tensile strength of not less than 36.5 kN/m, a melt index of 1.0 g/10 minutes, and a thickness of 7.6 mm.

 4. Nonwoven geotextile with apparent pore size of 0.18mm, water permeability of 0.26 Sec-1, permeability of 0.2cm/sec, puncture strength of 580N, trapezoidal tear strength of 356 N, holding tensile strength of 900 N, holding elongation strength of 50%, burst strength of 2750kPa.

 The development of modern industry has led to an increasing demand for environmental cleanliness, thus making the need for composite drainage nets more urgent. The main requirement for composite drainage nets is for small drainage force and high drainage efficiency. The materials used for composite drainage nets are generally anti-permeation membranes, and there are also nonwoven geotextiles. The composite drainage nets are oriented with fibers, and the yarns are too tightly packed. The yarns are tightly packed and cross-woven, with large gaps between the yarns. In order to improve the filtering efficiency, the fabric structure is generally tight, but this increases the filter resistance. As for filter paper, due to the tight fabric structure and small gaps, the accumulation of filtered material slightly increases and quickly increases the filter resistance, leading to a decrease in filtering efficiency. At the same time, its ability to resist creasing is extremely poor, seriously affecting its service life.

 Non-composite drainage mesh, due to the chaotic arrangement of fibers and the absence of warp and weft intersections, is more advantageous in having finer fibers, a looser structure, more interstices with small pore sizes, and better resistance to creasing. Composite drainage mesh can achieve high filtration efficiency, low filtration resistance, and a long service life. At the same time, due to the large capacity of interstices, even after accumulating a certain amount of filtering material, it can still maintain a low filtration resistance. For example, if polypropylene fibers are selected, due to their fine fiber degree, large specific surface area, and good chemical corrosion resistance, composite drainage mesh is especially suitable for industrial filtering materials. Due to the excellent properties of composite drainage mesh, it has been used to replace woven filter cloth and filter paper in many aspects.

The role of composite drainage mesh

 1. Layered between the foundation and the base, it is used to drain water from the foundation to the base, block capillary water, and effectively integrate into the edge drainage system. This structure automatically shortens the drainage path of the foundation, significantly reducing the drainage time, and can reduce the amount of selected foundation materials used (i.e., using materials with more fine particles and lower permeability). It can extend the service life of the road.

 2. The installation of drainage mesh on the base layer can prevent the base material from entering the sub-base layer (i.e., serving as an isolation function). The aggregate base will, to a limited extent, enter the upper part of the geotextile mesh. In this way, the composite geotextile drainage mesh also has a potential role in restricting the lateral movement of the aggregate base. In this manner, its function is similar to the reinforcing effect of geotextile grids. Generally, the tensile strength and rigidity of the composite geotextile drainage mesh are superior to those of many geotextile grids used for soil reinforcement. This limiting effect will enhance the bearing capacity of the foundation.

 3. After the road surface ages and cracks form, most of the rainwater will enter the road section. In this case, the drainage network is directly laid under the road surface, replacing the drainage foundation. The drainage network can collect the water before it enters the foundation/subbase. Moreover, a membrane can be wrapped around the bottom of the drainage network to further prevent water from entering the foundation. For rigid road systems, this structure allows for the design of the road with a higher drainage coefficient Cd. Another advantage of this structure is that it may allow for more uniform hydration of the concrete (the extent of this advantage is currently being studied). Whether for rigid or flexible road systems, this structure can extend the service life of the road.

 4. In northern climatic conditions, the installation of drainage networks can help mitigate the effects of frost heave. If the depth of freezing is considerable, the geotextile can be laid in a shallower position within the subbase to act as a capillary barrier. Additionally, it is often necessary to replace the granular subbase with one that is less prone to frost heave, extending down to the depth of the freezing. The fill soil that is prone to frost heave can be directly placed on top of the drainage network until the ground surface is reached. In this case, the system can be connected to drainage outlets, ensuring that the water table is at or below this depth. This can potentially restrict the development of ice crystals, and during the spring thaw in cold regions, there is no need to restrict traffic loads.