How to choose the thickness of geomembrane for irrigation reservoir
How to choose the thickness of geomembrane for irrigation reservoir
The geomembrance of irrigation reservoir is made of polyethylene resin. The main components are 97.5% high-density polyethylene, about 2.5% carbon black, aging resistance agent, oxygen resistance agent, ultraviolet absorbent, stabilizer and other auxiliary materials. It is made by automatic geoproduction equipment and three-layer co-extrusion technology. All products are in accordance with the United States GRI standards and ASTM test standards implementation of production, complete specifications, smooth surface roughness thickness of O. 20mm-4.0mm, wide 1m - 6m, to meet the environmental protection and sanitation, water conservancy, construction, municipal engineering, garden, landscape, petrochemical, mining, salt, agriculture, aquaculture industry application requirements.
Impermeable film features:
1. Complete width and thickness specifications (thickness 0.2-4mm, width 1-6m).
2.excellent resistance to environmental stress cracking performance.
3. large temperature range and long service life.
4.health and environmental protection. It is harmless to human body and does not pollute the environment. It is widely used in drinking water engineering abroad.
Geomembrane of irrigation reservoir is used in water conservancy engineering and also used for seepage prevention of general pool or channel, and sometimes used in the storage engineering of solution with more complex chemical composition or industrial waste. Geomembrane is used in different anti-seepage projects, and the thickness chosen is also different. The thickness of geomembrane has two requirements to determine. One is to control the amount of leakage, thicker geomemes can reduce the hydraulic gradient and thus reduce its permeability; On the other hand, it is controlled under the action of water pressure so as not to be punctured by the bottom soil particles.
According to the requirements, the thickness of the geomembrane depends on the size of the water pressure of the membrane material, the particle size of the underlying layer, and the elastic modulus of the membrane material itself and the allowable tensile stress. In the choice of impermeable film thickness including impermeable bedding at the bottom of modern reservoirs or reservoirs, the impermeable film slope and the lower interface should be considered to bear unbalanced friction, resulting in tensile stress in the geomembrane. Considering the reservoir water pressure, if the water depth is about 2m, can use 0.75mm or more than 0.75mm geomemetic seepage prevention; If the water depth of the reservoir is about 4m, you can use 1.0mm or more than 1.0mm geomemetic anti-seepage; If the water depth of the reservoir is about 8m, 1.2mm or more geomembrane should be used to prevent seepage. Specific reservoir impermeable geomembrane thickness should be determined according to the actual situation.
The construction method of geomembrane pool: after digging the pool, the geomembrane is laid, the bottom can be backfilled with soil, the top of the slope should be anchored, and the width of the geomembrane can be welded or glued to butt. Pool geomembrane practice; Key points are handled at edges and corners, and anchored. The tools used are double rail welding machine, single rail welding machine, hot air welding gun.
