Composite Drainage Network

Composite drainage network description:

One: Composite drainage net (also known as three-dimensional composite drainage net, drainage mesh, drainage geogrid) is a new type of drainage geotechnical material. It is made of high-density polyethylene (HDPE) through a special extrusion molding process and has a special three-layer structure. The ribs in the middle are rigid and arranged longitudinally to form a drainage channel. The ribs arranged cross-wise up and down form a support to prevent the geotextile from being embedded in the drainage channel, and maintain high drainage performance even under high loads. The double-sided bonding water-permeable geotextile is used in combination, and has the comprehensive performance of "reverse filtration-drainage-ventilation-protection", and is currently an ideal drainage material. Product use: mainly used in drainage projects such as railways, highways, tunnels, municipal engineering, reservoirs, and slope protection.

  Features:

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

2. High tensile strength.

3. Reduce the probability of geotextile embedded in the mesh core and maintain long-term stable drainage.

4. Long-term bearing high pressure load (can withstand about 3000Ka compressive load).

5. Corrosion resistance, acid and alkali resistance.

6. The construction is convenient, the construction period is shortened, and the cost is reduced.

Executive standard: Q/321081 GTH002-2011

Remarks: The roll length can be processed according to the customer, and special specifications can be customized separately.

2. Geotechnical composite drainage network for landfill

In landfills, geocomposite drainage nets can be used for:

1. Groundwater drainage layer

2. Leak detection layer

3. Leachate collection and drainage layer

4. Closure gas collection and drainage layer

5. Surface water collection and drainage of the closed site

3. Landfill leachate drainage layer and leakage detection layer

In order to prevent the leakage of the lining system and ensure the safety of the landfill, the leachate drainage system must have reliable drainage performance, discharge the leachate collected by the lining system, and ensure that the saturated head of the leachate of the lining is less than the thickness of the drainage layer. Traditional natural drainage materials such as sand and gravel are used for leachate collection and drainage in landfills, which will take up a lot of landfill space. For slope leachate drainage, using sand and gravel will be difficult to stack. The use of geotechnical composite drainage nets is basically not limited by the slope of the slope. Gravel acts as a leachate collection and drainage layer, which can cause damage to the anti-seepage geomembrane. According to statistics, the laying of gravel on the geomembrane is the cause of geomembrane damage, accounting for more than 70% of the total damage.

The three-dimensional geotechnical composite drainage network has a three-dimensional three-dimensional drainage structure. It is composited with high-permeability geotextiles and can maintain long-term drainage performance under extremely high loads. It is used for the main leachate collection and drainage layer (LCRS), which can The leachate of the anti-seepage membrane is discharged in time, so that the water head is smaller than the thickness of the geotechnical drainage material, and the leakage of the geomembrane caused by excessive water head is reduced.

4. Landfill closure gas drainage layer and surface water drainage layer

The purpose of the final cover and closure system of the landfill is to limit the infiltration of precipitation into the landfill waste, and minimize the output of leachate that may invade the water source. In the closure system, the function of the surface water drainage layer is to drain the water that seeps into the cover soil layer and avoid accumulation on the anti-seepage layer. Accumulated water will generate excess pore water stress on the anti-seepage layer of the closure, which may cause sliding of the vegetation covering soil layer and damage to the closure slope. Traditionally, sand and gravel are used as the surface water drainage layer of the closure. For slopes with large slopes, it is difficult to stack sand and gravel cushions. However, the use of geotechnical composite drainage nets can be applied to steeper closure slopes and can also Increase the landfill volume of waste. The three-dimensional geotechnical composite drainage network has high drainage performance, which can timely remove surface water seepage and ensure the stability of the closed slope. Closure gas conduction layer The exhaust capacity of the gas conduction layer of the landfill closure system is insufficient or there is no flat gas conduction layer, and the gas pressure applied to the anti-seepage layer is too high, which may cause the closure system to destroy. The gas drainage layer of the closure system can use a geotechnical composite drainage network with high drainage performance. Use a high-conductivity three-dimensional geotechnical composite drainage network, or a geotechnical composite drainage network combined with sand and gravel to form the gas conduction layer of the landfill closure system. The geotechnical composite drainage network is used as the surface water drainage layer and the gas drainage layer in the landfill closure system, which can be applied to steeper slopes. Its high drainage performance can remove seepage and gas in time to ensure the slope Stablize.

5. Landfill or reservoir groundwater drainage

The groundwater table in the landfill area or reservoir of the waste landfill is high, and the pressure of the groundwater may damage the anti-seepage liner. A groundwater drainage layer is required to drain the rising groundwater so that the anti-seepage liner is not damaged.

The slope of the landfill site or the dam body of the reservoir may also be damaged due to too much water pressure, which may cause damage to the slope or dam body and the anti-seepage layer of the slope. Using geotechnical geotechnical composite drainage network as groundwater drainage layer can discharge rising groundwater in a short time and prevent excessive groundwater pressure from damaging the anti-seepage liner. Geotechnical composite drainage net has high tensile strength and can strengthen the foundation. The geotechnical composite drainage network is used for seepage conduction and drainage of slopes or dams. It can collect and discharge the seepage of slopes, effectively eliminate the lateral pressure applied to the anti-seepage layer, and reduce or eliminate possible damage caused by water pressure.

6. Drainage of railway system

Railway embankments can be damaged by water from both the ground and the surface. If the groundwater level is too high, the rising groundwater will erode the roadbed, damage the railway structure, and reduce the bearing capacity of the roadbed. If the rainfall or snow water from the road surface cannot be discharged in time, it will contaminate the ballast, produce mud and mud, and lead to rail deformation and other adverse consequences.

Set up a composite drainage network drainage layer under the subgrade foundation or ballast to remove rising groundwater or road surface seepage. The geotechnical composite drainage network has high strength and rigidity, which can effectively reinforce the embankment or ballast and improve its bearing capacity. It is used for drainage of railway system and can effectively eliminate the generation of frost heaving. The use of geotechnical composite drainage net with sand and gravel can form an effective railway drainage system and quickly guide the drainage of railway groundwater or surface water seepage.

7. Highway subgrade and pavement drainage

Free water entering the pavement structure is an important cause of causing or accelerating pavement damage. The hydrodynamic pressure generated by road water under the high-speed tires directly scours the internal mixture, and the hydrodynamic pressure increases geometrically with the increase of vehicle speed. Free water in or near a road surface can shorten the life of the road. If free water seeps through the pavement and soaks into the subgrade, no matter how thick the pavement is, the road will fall apart as it loses its bearing surface.

Set up the internal drainage system of the pavement to quickly drain the water accumulated in the pavement structure to the outside of the pavement and subgrade structure, improve the performance of the pavement and increase its service life. The design life of a road with a good drainage system is 2 to 3 times longer than that of a road without drainage. The drainage problem of the road can be better solved by using the geotechnical composite drainage network. The direct and continuous laying of geotechnical composite drainage network in the road system can not only achieve good drainage effect, but also greatly reduce the thickness of the base or subbase, improve the bearing capacity, and eliminate uneven settlement.

8. Drainage of tunnel and retaining wall structure

The tunnel or the back of the retaining wall may cause structural damage due to excessive water pressure. The drainage performance of the tunnel lining is insufficient or there is no drainage layer. Excessive water pressure will damage the anti-seepage layer and eventually lead to leakage. If a layer of drainage layer is set on the anti-seepage layer, the seepage water from the mountain body will be collected and discharged first, and the water pressure applied to the anti-seepage liner will be eliminated to achieve the purpose of anti-seepage.

The retaining wall cannot be discharged in time due to the water behind the abutment. Excessive water pressure may damage the structure of the retaining wall and cause the retaining wall to collapse. The solution is: set a flat drainage layer behind the retaining wall platform to discharge the water on the back of the retaining wall platform in time.

Using double-rib or three-dimensional geotechnical composite drainage network as the horizontal drainage layer on the back of the tunnel or retaining wall abutment, the thin material has a high drainage capacity and is convenient for construction. Its superiority is unmatched by traditional sand and gravel materials.

The design life of a road with a good drainage system is 2 to 3 times longer than that of a road without drainage. The drainage problem of the road can be better solved by using the geotechnical composite drainage network. The direct and continuous laying of geotechnical composite drainage network in the road system can not only achieve good drainage effect, but also greatly reduce the thickness of the base or subbase, improve the bearing capacity, and eliminate the incomparable uneven settlement of stone materials.