Geotextile mat three dimensional in china is a new geosynthetic material. The composite structure is a three-dimensional geonet core, both sides of which are bonded with needle punched non-woven geotextiles. The 3D geogrid core consists of a thick vertical rib and a diagonal rib at the top and bottom. It can quickly discharge the underground water of the road, and 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 geosynthetic material.

The geotextile mat three dimensional in china is made of special three-dimensional geonet with double-sided bonded geotextile. The combination of geotextile (anti filtration) and geonet (drainage and protection) provides a complete "anti filtration drainage protection" effect.

The unique three-dimensional structure of geotextile mat three dimensional core can bear high compression load in the whole use process, and can maintain a considerable thickness, providing a good water conductivity.

Characteristics of geotextile mat three dimensional in china:

1. When the load is 720kpa and the gradient is 2%, the permeability is 2500m / D and the flow rate is 13PM / m.

2. In the creep test, more than 60% of the thickness of three-dimensional drainage network is retained after 10000 hours of bearing 1200kPa load

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

4. Nonwoven geotextiles have apparent pore diameter of 0.18mm, water permeability of 0.26 sec-1, permeability of 0.2cm/sec, puncture strength of 580n, trapezoid tear strength of 356n, grip tensile strength of 900N, grip extension strength of 50%, and burst strength of 2750kpa.

Function characteristics of geotextile mat three dimensional in china:

1.It is laid between the foundation and the subbase to drain the 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 shortens the drainage time, and reduces the number of selected foundation materials (i.e. materials with more fine materials and lower permeability can be used). It can extend the service life of the road.

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

3.After the road is aged and cracks are formed, most of the rainwater will enter the section. In this case, the geotextile mat three dimensional is directly laid under the pavement instead of the drainage foundation. The geotextile mat three dimensional can collect the water before it enters the foundation / subbase. In addition, a layer of membrane can be wrapped at the bottom of the geotextile mat three dimensional to further prevent water from entering the foundation. For a rigid road system, this structure allows the design of the road with a higher drainage coefficient CD. Another advantage of this structure is that it is possible to make the concrete hydrate more evenly (the degree of this advantage is being studied). Whether for rigid road or flexible road system, this structure can extend the service life of the road.

4. In the northern climate, laying geotextile mat three dimensional can help to reduce the impact of frost heave. If the freezing depth is very deep, the geonet can be laid in the shallower position of the foundation as a capillary block. In addition, the granular subbase which is not easy to frost heave is often used to replace it and extend down to the frozen depth. The backfill soil easy to frost heave can be directly filled on the three-dimensional composite drainage network until the surface line of the ground base. In this case, the system can be connected to the drain outlet so that the groundwater level is at or below this depth. In this way, the development of ice crystals can be potentially limited. When ice melts in spring in cold areas, the traffic load is not limited.

Joint and lap of geotextile mat three dimensional:

1. Adjust the direction of geosynthetics so that the length direction of the material roll is perpendicular to the road.

2. The composite geotextile drainage network must be terminated, and the geotextile on the adjacent geogrid core shall be lapped along the material roll.

3. Connect the geonet core of the adjacent geotechnical material roll with white or yellow plastic buckle or polymer belt to connect the material roll. Along the length of the roll, tape it every 3 feet.

4. The direction of overlapping geotextiles shall be the same as that of packing stacking. If the geotextile is laid between the foundation / base and subbase, continuous wedge welding, flat welding or sewing shall be carried out to fix the upper layer of the overlapped geotextile. If stitching, flat head stitching or general stitching is recommended to meet the lower requirements of the stitch length.