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The main mechanism is to block the leakage channel of the earth dam with the impermeability of the plastic film, to bear the water pressure and adapt to the deformation of the dam body with its greater tensile strength and elongation. And non-woven fabric is a kind of high polymer chemical short fiber material, through needle stick or hot forming, has high tensile strength and extensibility, it combines with plastic film, not only increased the tensile strength and puncture resistance of plastic film, and because the non-woven fabric surface is rough, increasing the contact surface friction coefficient, is advantageous to the composite geomembrane, and the stability of the protective layer. At the same time, they have better corrosion resistance to bacteria and chemical action, not afraid of acid, alkali, salt erosion, in the case of light, long service life.

GCL is a kind of impermeable gasket between GCL (field thick compacted clay impermeable gasket) and geoolymer material. It is mainly used in the waste landfill site, underground reservoir, underground infrastructure construction and other projects in environmental engineering to solve the problems of sealing, isolation and leakage prevention, with good effect and strong resistance to destruction.

Bentonite waterproof blanket can be divided into: needling sodium bentonite waterproof blanket, needling coated sodium bentonite waterproof blanket and gluing sodium bentonite waterproof blanket. The needling coated sodium bentonite waterproof blanket is composed of a high density polyethylene geomembrane on the surface of non-woven geotextile of needling sodium bentonite waterproof blanket. Adhesive method sodium bentonite waterproof blanket, is the use of adhesive bentonite particles bonded to high-density polyethylene board, compressed production of a sodium bentonite.

The mineralogical name of bentonite is Montmorillonite, and the natural bentonite can be divided into two categories according to the chemical composition: sodium base and calcium base. Encounter water swelling characteristics of bentonite, calcium base bentonite expands, its only about three times the size of its expansion, and sodium base bentonite adsorption five times its own weight of water in case of water, the volume expansion to the original 15 to 17 times above, lock sodium base bentonite in the middle of the two layers of geosynthetic materials, protection and reinforcement effect, make the GCL has a certain overall shear strength.

Technology, Other details subject to 《GRI-GVL3 Standard Specification》

Bentonite expansion coefficient (ml/2g) ≥24;

GCL unit area mass (g/m2) ≥4000;

GCL longitudinal fracture strength (KN/m) ≥6;

GCL transverse fracture strength (KN/m) ≥6;

Elongation at break of GCL (%) ≥10;

GCL transverse fracture elongation (%) ≥10;

GCL vertical permeability coefficient (cm/s) ≤5×10-11;

GCL peel strength (N/100mm) ≥40; GCL hydrostatic test 0.4mpa, 1h, no leakage.