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Three-dimensional drainage network

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Three-dimensional drainage network

In the railway, highway and other transportation infrastructure, the safety and service life of the project has a close relationship with its own drainage system, which is an important part of the drainage system.

Three dimensional composite drainage net is a new type of earthwork synthetic material. The composition structure is a three-dimensional soil net core, and the two sides are stuck with needle punched non-woven fabric. Three dimensionalgeonet core includes a thick vertical rib, rib and the top and bottom of a tilted. The groundwater, which can quickly discharge the road, has a pore maintenance system, which can block the capillary water under high load. At the same time, it can also play the role of isolation and foundation reinforcement. A new type of geo synthetic material.

Characteristics of three dimensional composite drainage net:

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

2, creep test under 1200kPa load for 10000 hours, retaining more than 60% of the thickness,

3, third intercostal drainage network core carbon black content not less than 2%, the density 0.94g/cm3, tensile strength of not less than 36.5kN/m and melt index of 1.0 g / 10min, 7.6mm thickness.

4, no woven geotextile fabric apparent pore 0.18mm, the permeable rate of 0.26 Sec-1, permeability 0.2cm/sec, punctured strength 580N, n 356 of the trapezoidal tearing strength, tensile strength of holding 900 n grip extension strength by 50%, burst strength 2750kPa.

The function characteristics of three dimensional composite drainage net:

1, laying between the foundation and the bottom base, for the discharge of water between the foundation and the bottom base, blocking the capillary water and effectively combined to the edge of the drainage system (see Figure 1). This structure automatic relationship foundation drainage channels, drainage time is greatly shortened and the selection of foundation material is used to reduce the number (can be used with more fine material, with relatively low permeability material). Can prolong the service life of the road.

2, in the bottom of the laying of three-dimensional composite drainage network to prevent the bottom base of fine material into the ground (that is, to play a role in isolation). Aggregate base will be in a limited extent to the upper part of the geotechnical network. In this way, the composite geotechnical drainage network also has a potential to limit the horizontal movement of the aggregate base, in this way, it is similar to the role of the reinforcement of the soil grid. Generally speaking, the tensile strength and rigidity of composite geotechnical drainage net is better than that of many geotechnical grids for foundation reinforcement, which will improve the supporting capacity of the foundation.

3, the road aging, cracks formed, most of the rain will enter the section. In this case, the three-dimensional composite drainage net is laid directly under the pavement, instead of the drainage foundation. Three-dimensional composite drainage network can be in the water into the ground / before the end of its first collection. It can also be a layer of film on the bottom end of the three-dimensional composite drainage net to further prevent moisture from entering the foundation. For rigid road systems, this structure allows the design of the road with a high coefficient of drainage Cd. Another advantage of this structure is that it is possible to make the concrete more evenly hydrated (the study of the degree of this advantage is being carried out). This structure can extend the service life of the road, whether it is the rigid road or the flexible road system.

4, in northern climates, the laying of 3D composite drainage net can help reduce the impact of frost heave. If the freezing depth is very deep, the soil can be laid in the bottom of the base of the location, as a capillary blockage. Also often need to use granular subbase replacement is not easy to frost, extends to frozen depth. Backfill easy freezing can directly fill in the three-dimensional composite drainage net top, until the base line surface. In this case, the system can be connected to the drain outlet, so that the underground water level is equal to or below this depth. This could potentially limit the development of ice crystals, which are not restricted to traffic loads during the spring ice melting in cold regions.

Joint and lap joint of three-dimensional composite drainage net:

1, adjust the direction of the composite material, so that the length of the material volume is perpendicular to the direction of the road.

2, the composite geotechnical drainage network must be connected, adjacent to the soil on the core of the earthwork cloth along the material roll lap. See figure 2.

Figure 2 end connection and lap

3, the adjacent soil of the earthwork net core core with white or yellow plastic buckle or polymer belt link up, so as to connect the material volume. Along the length of the material roll, connect the tape once every 3 feet.

4. The direction of the lap joint is in line with the direction of the packing. If the geotextiles laying in Foundation / base and subbase between, it is necessary to carry out continuous wedge welding, tack welding or suture, the lap of geotextile fabric upper fixed. If the suture, recommend the use of flat stitch or seam method, in order to achieve the minimum requirements of stitch length.

project Technical index
Product Name

Mass per unit area

Quality deviation
breaking strength
Water conductivity
¡İ500kpa   m2/s
Width deviation Length deviation
850 -6 5 10 2.0¡Á10-4 -0.06m -1.0m
900 6 10
1000 7 10
1200 8 10
1700 9 10
Geotechnical cloth 200 -5 -- 10.0 -- -- --