Product Introduction

Composite drainage network (also known as three-dimensional composite drainage network, drainage grid, drainage geogrid) is a new type of drainage geotechnical material. Using high density polyethylene (HDPE) as raw material, it is processed by special extrusion molding process and has a three-layer special structure. The middle ribs are rigid and arranged longitudinally to form a drainage channel, and the upper and lower cross-arranged ribs form a support to prevent the geotextile from being embedded in the drainage channel, which can maintain high drainage performance even under high loads. Double-sided adhesive seepage geotextile composite use, with "filter-drainage-breathable-protection" comprehensive performance, is the ideal drainage material.

 

Product use

Mainly used for railway, highway, tunnel, municipal engineering, reservoir, slope protection and other drainage engineering effect is remarkable.

 

Product Features

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

◎High tensile strength.

◎ reduce the probability of geotextile embedded mesh core, maintain long-term stable drainage.

◎ Long-term high-pressure load (can withstand about 3000Ka compression load).

◎ Corrosion resistance, acid and alkali resistance, long service life.

 

Technical parameters and physical indexes of three-dimensional composite drainage network

Serial Number	Project	Unit	Standard value
			1200g	1400g	1600g	1800g	2000g
1	Mass per unit area of complex	G/square meter	≥ 1200	≥ 1400	≥ 1600	≥ 1800	≥ 2000
2	Composite thickness	mm	≥ 6.0	≥ 7.0	≥ 8.0	≥ 9.0	≥ 10.0
3	Longitudinal tensile strength of composite	KN/m	≥ 16.0	≥ 16.0	≥ 16.0	≥ 16.0	≥ 16.0
4	complex hydraulic conductivity	m²/s	≥ 1.2 × 10-4	≥ 1.2 × 10-4	≥ 1.2 × 10-4	≥ 1.2 × 10-4	≥ 1.2 × 10-4
5	Peel strength of mesh core and non-woven fabric	KN/m	≥ 0.3	≥ 0.3	≥ 0.3	≥ 0.3	≥ 0.3
6	Mesh core thickness	mm	≥5.0	≥5.0	≥ 6.0	≥ 7.0	≥ 8.0
7	Tensile strength of mesh core	KN/m	≥ 13.0	≥ 15.0	≥ 15.0	≥ 15.0	≥ 15.0
8	Non-woven fabric mass per unit area	G/square meter	≥200	≥200	≥200	≥200	≥200
9	non-woven fabric normal permeability coefficient	cm/s	≥ 0.3	≥ 0.3	≥ 0.3	≥ 0.3	≥ 0.3
10	Width	m	2.1	2.1	2.1	2.1	2.1
11	Roll length	m	30	30	30	30	30

 

Geo-composite drainage net for landfill

In landfills, geocomposite drainage nets can be used:

◎ Groundwater drainage layer

◎ Leakage detection layer

◎ Leachate collection and drainage layer

◎ Sealing field gas collection and drainage layer

 

Landfill leachate guide 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 lining leachate 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 occupy a large amount of landfill space. For slope leachate drainage, the use of sand and gravel will be difficult to stack. The use of geotechnical composite drainage network is basically not limited by the slope gradient. Gravel as leachate collection guide layer, will cause damage to the impermeable geomembrane. According to statistics, the placement of gravel on the geomembrane is the major cause of geomembrane damage, accounting for more than 70% of the total damage.

The three-dimensional geotechnical composite drainage network has a three-dimensional spatial three-dimensional drainage structure. It uses geotextile composite with high permeability, which can maintain long-term drainage performance under extremely high load. It is used for the main leachate collection and drainage layer (LCRS), and can discharge the leachate of the impermeable membrane in time, making the water head smaller than the thickness of the geotechnical drainage material, and reducing the leakage of the geomembrane caused by excessive water head.

 

Landfill closure gas and surface water

The purpose of the final landfill cover closure system 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 sealing system, the function of the surface water guide layer is to discharge the water penetrating into the covering soil layer to avoid accumulation on the impermeable layer. Accumulated water will produce excess pore water stress on the impermeable layer of the sealing site, which may lead to sliding of the vegetation-covered soil layer and damage to the slope of the sealing site. Traditionally, gravel is used as the surface water guide and drainage layer of the sealing site. For the slope with large slope, it is difficult to stack the gravel cushion layer. However, the use of geotechnical composite drainage network can be applied to the steeper slope of the sealing site and can also increase the landfill volume of garbage. The three-dimensional geotechnical composite drainage network has high drainage performance, which can eliminate the surface seepage in time and ensure the stability of the slope of the sealing site. The exhaust capacity of the gas guide layer of the sealing system of the landfill site is insufficient or there is no plane gas guide layer, and the gas pressure applied to the impermeable layer is too large, which may cause damage to the sealing system. The geotechnical composite drainage network with high conductivity and drainage performance can be used in the gas guide and drainage layer of the sealing system. Use high-conductivity drainage three-dimensional geotechnical composite drainage network, or geotechnical composite drainage network combined with sand and gravel to form the gas guide drainage layer of the landfill closure system. The geotechnical composite drainage network is used as the surface water guide layer and gas guide layer in the landfill closure system, which can be applied to steep slopes, and its high drainage performance can remove water seepage and gas in time to ensure the stability of the slope.

 

Groundwater drainage in landfill or reservoir

The groundwater level in the landfill area or reservoir is high, and groundwater pressure may damage the impermeable liner. It is required to have a groundwater guide and drainage layer to discharge the rising groundwater so that the impermeable liner will not be damaged.

Landfill slope or reservoir dam body may also cause damage to the slope or dam body and the impermeable layer of the slope due to too much water pressure. The use of geotechnical composite drainage network as a groundwater drainage layer can discharge the rising groundwater in a very short time to prevent excessive groundwater pressure from damaging the impermeable liner. The geotechnical composite drainage network has high tensile strength and has the effect of strengthening the foundation. The geotechnical composite drainage network is used for the seepage guide and drainage of the slope or dam body, which can collect and discharge the mountain seepage of the slope, effectively eliminate the lateral pressure applied to the impermeable layer, and reduce or eliminate the damage that may be caused by the water pressure.

 

Drainage of railway system

The railway roadbed may be damaged by water from underground and surface. If the groundwater level is too high, the rising groundwater will erode the subgrade, destroy the railway structure, and reduce the bearing capacity of the subgrade. If the rainfall or snow water from the road surface cannot be discharged in time, it will pollute the ballast, produce slurry and mud, and cause adverse consequences such as rail deformation.

The drainage layer of composite drainage network shall be set under the subgrade foundation or ballast to remove the rising groundwater or seepage from the road surface. The geotechnical composite drainage network has high strength and rigidity, which can effectively strengthen the embankment foundation or ballast and improve its bearing capacity. Used for railway system drainage, can effectively eliminate the generation of frost heaving geotechnical composite drainage network with the use of sand and gravel, can form an effective railway drainage system, rapid drainage of railway groundwater or surface seepage.

 

Road Subgrade and Pavement Drainage

Free water entering the pavement structure is an important cause of causing or accelerating pavement damage. The dynamic water pressure generated by road water under high-speed driving tires directly scour the internal mixture, and the dynamic water pressure increases geometrically with the increase of vehicle speed. Free water inside or near the road surface will shorten the service life of the road. If free water seeps through the pavement and into the subgrade, no matter how thick the pavement is, the road will fall apart due to the loss of bearing surface.

Set up the internal drainage system of the pavement to quickly discharge the water accumulated in the pavement structure to the pavement and subgrade structure, improve the performance of the pavement and increase its service life. The design life of roads with good drainage systems is 2 to 3 times higher than that of roads without drainage. Through the use of geotechnical composite drainage network can better solve the problem of road drainage. 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.

 

Drainage of tunnel and retaining wall structure

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

The water behind the retaining wall cannot be discharged in time, and excessive water pressure may damage the retaining wall structure and cause the retaining wall to collapse. The solution is to set up a plane drainage layer behind the retaining wall platform to discharge the moisture on the back of the retaining wall platform in time.

The use of double ribs or three-dimensional geotechnical composite drainage network as the tunnel or retaining wall back plane drainage layer, very thin material with high drainage capacity, convenient construction, its superiority is the traditional gravel material can not match.

The design life of roads with good drainage systems is 2 to 3 times higher than that of roads without drainage. Through the use of geotechnical composite drainage network can better solve the problem of road drainage. In the road system directly, continuous laying of geotechnical composite drainage network, not only can achieve good drainage effect, but also can greatly reduce the thickness of the base or subbase, improve the bearing capacity, eliminate uneven settlement stone material can not be compared.