Impermeable Membrane Can Ensure the Anti-seepage Requirements of The Building Foundation
Impermeable membrane, also known as polyethylene high quality textured geomembrane, is a composite impermeable material made of polyethylene film as the base film and geotextile as the base fabric, which is extruded and bonded together by the head of the coating machine at high temperature. Its anti-seepage performance mainly lies in the anti-seepage performance of the PE film. The composite geotextile has strong puncture resistance. Therefore, when a weak point is encountered, the geotextile will concentrate on the weak point to protect the plastic film. effect.
Geomembrane has good flexibility, small specific gravity, strong extensibility, strong adaptability to deformation, acid and alkali corrosion and temperature resistance
Good endurance. The main mechanism is that the waterproof performance of the plastic film blocks the leakage channel of the foundation, bears the pressure of the water body, adapts to the deformation of the foundation caused by various factors, and has good tensile strength and elongation performance. Anti-seepage high quality LDPE geomembrane is widely used in the anti-seepage treatment of dams, channels, sewage ponds, etc. because of their good anti-seepage performance and low cost.
The anti-seepage membrane can ensure the anti-seepage requirements of the building foundation and is widely used in the construction of projects with anti-seepage function requirements, such as the anti-seepage lining of dams, channels, reservoirs, hydraulic tunnels, artificial lakes, and breeding ponds. However, in the past construction, the connection between the new membrane and the new membrane, the old membrane, and the new high quality environmental geomembrane has some disadvantages, such as the connection strength is much lower than the base material, the connection quality is not reliable, and it is easy to crack and leak.
The selection of composite geomembrane specifications are related to the flatness of the cushion, the allowable tensile stress of the material, the elastic modulus of the material, the maximum water head within the laying range, and the maximum particle size of the covering layer. In addition to the strength required by water pressure, the design of wholesale HDPE geomembrane thickness should also consider application conditions such as exposure, buried pressure, climate, and service life. The design thickness and actual thickness should be determined according to the current relevant national standards.
The composite geomembrane anti-seepage structure is composed of a protective layer, an upper cushion layer, an anti-seepage layer, a lower cushion layer, and a support layer from top to bottom. The backfill of the dam body above the elevation of 369.50 meters is strongly weathered mud and slag. After leveling and tamping, lay a 15cm thick lower sand cushion, then a high quality aquaculture geomembrane, and then a 15cm thick upper sand cushion and a 15cm thick gravel cushion. Finally, 15cm thick C20 concrete is used for slope protection. Above. The cushion is made of mortar with a thickness of 5 cm, and the protective layer is made of precast concrete slabs with a thickness of 6 cm. The design elevation of the grouting platform is 369.50 cm. After the curtain grouting is completed, a tooth groove with a bottom width of 1.00 meters and a depth of 2.50 meters is excavated on the curtain grouting axis. The geomembrane is directly laid on the bottom of the alveolar, and the clay is backfilled and compacted.
Since the friction coefficient between the composite geomembrane and the earth-rock medium and between the earth-rock medium will affect the stability of the impervious body, the anti-sliding stability of the composite geomembrane and the dam slope, the composite low price aquaculture geomembrane and the protective layer must be reviewed.