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Geosynthetics-Geonets drain

Description Specifications Scope of Application FAQ Download

Description

Composite drainage mesh (also known as 3D geotechnical drainage sheet, tunnel drainage waterproof sheet, drainage waterproof sheet) consists of a three-dimensional structure of plastic mesh bonded on both sides with a permeable geotextile, which can replace the traditional sand and gravel layer. YH Composite drainage mesh provides a complete "anti-filtration - drainage - protection" effect. The unique three-dimensional structure of its core can withstand high compressive loads during the entire service life, while maintaining a considerable thickness and offering excellent hydraulic conductivity.

Specifications

Characteristics and Packaging


Item	Description
Packaging	Roll
Width (m)	3~6
Length (m)	30~50
Roll Size (m2/roll)	90~300

Properties

Properties	Unit	Inspection Standards	Inspection
Properties	Unit	Inspection Standards	TG-5	TG-6	TG-7	TG-8
Drainage mesh Thickness	mm	ASTM D 5199	5	6	7	8
Drainage mesh Tensile Strength	mm	ASTM D 7179	7	8	10	12
Drainage Density	g/m³	ISO 1183	0.94
Drainage Carbon Black Content	%	ASTM D 1603	2
Hydraulic Conductivity(CD)	㎡/s	ASTM D 4176	3*10-4
Peel Strength	kN/m	ASTM D 7005	0.17
Geotextile Mass Per Unit Area	g/㎡	/	200

Features & Benefits

· High drainage (equivalent to one metre thick gravel drainage).

· High tensile strength.

· Reduces the chance of geotextiles becoming embedded in the mesh core and maintains stable drainage over time.

· Long-term resistance to high pressure loads (withstands compression loads of approximately3000 Ka).

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

· Easy to construct, shorten the construction period and reduce costs.

Application Instructions

· When the composite drainage mesh is laid on a slope with a gradient greater than 10%, the number of transverse overlaps (welding) along the slope direction should be minimized as much as possible. If overlapping is necessary, the composite drainage mesh must overlap by at least 600mm and be bound with plastic straps at intervals of 150mm; when the slope is less than 10%, the transverse overlap of the composite drainage mesh should not be less than 150mm and be bound with plastic straps at intervals of 150mm. All composite geonets must extend 1.5m beyond the slope toe.

· The longitudinally overlapped part of the composite drainage mesh must overlap by at least 100mm and be tightly bound with plastic straps. The binding straps should be located in the middle of the overlapping part and pass through at least one mesh axis of the composite drainage mesh. The binding spacing of the composite drainage mesh along the joints of the slope is 1500mm, and the binding spacing of the joints at both ends of the anchorage trench and the bottom of the landfill site is 150mm.

· The upper geotextile of the composite drainage mesh must overlap by at least 150mm, and the lower geotextile should be lapped. The upper geotextile must be sewn or welded together, and the joints must be sewn with at least one row of double-thread stitches. The thread used for sewing must be resistant to chemical corrosion and ultraviolet rays. If there are skipped stitches, the affected part must be re-sewn.

· The composite drainage mesh must be laid downward along the slope to ensure that the length direction is along the direction of water flow. For long and steep slopes, special attention must be paid to using material rolls with complete lengths only at the top of the slope.

Scope of Application

Mainly used in Drainage in landfills (groundwater drainage, leachate detection layer, leachate collection and drainage, closed landfill gas collection and drainage, highway subgrade and pavement drainage, railway drainage, tunnel drainage, underground structure drainage); Drainage for retaining wall surfaces, gardens and sports fields.

FAQ

Q1: What is a geomembrane?

A geomembrane is a synthetic membrane liner or barrier used to control fluid migration in a wide range of civil, environmental, and industrial applications.
Q2: Why should I choose a geosynthetic barrier instead of traditional clay liners?

Geosynthetics offer superior impermeability, faster installation, reduced thickness requirements, and higher chemical resistance compared to traditional compacted clay liners.
Q3: How long does a geomembrane last?

Depending on the material and environmental conditions, service life can range from 30 to over 100 years.
Q4: Is it safe for drinking water or sensitive environmental applications?

Yes, certain geomembranes are certified safe for potable water use and meet environmental regulations like NSF or GRI-GM standards.
Q5: What factors should be considered when selecting a geomembrane?

Key factors include chemical resistance, mechanical strength, UV resistance, site conditions, expected service life, and installation method.
Q6: How thick should the geomembrane be?

Common thicknesses range from 0.5 mm to 3.0 mm, depending on application requirements and site-specific conditions.
Q7: Are there international standards or specifications for geomembranes?

Yes, ASTM, ISO, and GRI (Geosynthetic Research Institute) standards provide guidelines for testing and performance.