Does geomembrane pollute the environment?

Geomembrane is usually referred to as polyethylene geomembrane, which is composed of polyethylene resin, carbon black, antioxidant and anti-aging masterbatch and other main raw materials. Geomembranes are used in a large number of desert tree planting projects, which can bring us a lot of benefits for these projects, and also can make our desert become like a lot of oasis.

HDPE geomembrane should be pressed by cement square bricks or car tires to prevent it from being blown away by the wind after it is covered, and the distance between the pressure blocks shall not be greater than 2000mm, and the pressure blocks are used on the side slopes to connect the plastic ropes between the pressure blocks or the geomembrane strips to weld the pressure blocks to be used as the stabilizing measures. Therefore, in the inclined plate instrument test geomembrane and geotextile contact surface friction characteristics of the analysis, the test contact area is required to be not less than 200mm, which also requires that in the construction of the project, not only pay attention to the composite geotechnical engineering itself, but also take into account in the bottom of the surface of the quality of the support layer and the protective layer of the geomembrane and the geotextile welding, in order to ensure that the composite geomembrane adhesion quality, the general use of hot-melt welding method. When welding, we should pay attention to grasp the welding speed is moderate, as well as the geomembrane and both sides of the geotextile between the size and fit.

Blow molding method of geomembrane manufacturing, in the roll must be cut, spread, single-layer roll. So what are the tricks of geomembrane in connection with pipeline and concrete? Geomembrane connection with the pipeline: the connection part of the pipeline should be selected polyethylene pipe. On the cap concrete pouring bank slope or the top of the impermeable curtain, and will be the edge of the geomembrane to the concrete, shown in the connection of the impermeable heart wall cofferdam, geomembrane insertion depth shall not be less than 0.3 m, and at least 10 cm light membrane edge should be injected into the concrete. Geomembrane laying is divided into reservoir bottom laying, slope laying two parts. Geomembrane paving in the root zone to increase the soil water content in the root zone, the reason is mainly underground geomembrane by truncating the soil capillary, change the soil water transport and distribution, increase soil water retention.

Geomembrane used for seepage control project, the main material selection should meet the following requirements: in general, it is appropriate to use the geomembrane or composite geomembrane; to withstand high tensile force, it is appropriate to use reinforced composite geomembrane; complex terrain, geomembrane welding quality is difficult to ensure that the requirements of the seepage barrier layer is easy to self-healing after the damage, geosynthetics can be used to prevent seepage point bentonite clay. Out of the shortcomings of the geotextile sheet and stitching must be clearly marked on the geomembrane, and make repairs. In the protection of geomembrane, the geotextile fabric composite to the membrane on both sides actually plays a double-edged sword, on the one hand, the fabric to protect the geomembrane from damage, especially in preventing a large number of scratches and abrasions, the role is very obvious.

On the other hand, once the geomembrane is smashed or punctured, especially the number of cases, the distribution of scattered, due to the fabric cover, the damage will not be easy to be found, which will become a leakage channel. The main reasons for such sliding are: the uneven settlement of the foundation of the geotechnical dam makes the protective layer of geomembrane and the upper bedding layer of geomembrane have relative displacement along the surface of the geomembrane; if the densification degree of the protective layer of geomembrane and the upper bedding layer is relatively small, then the protective layer and the upper bedding layer will be in a subsidence situation; the protective layer of geomembrane and the upper bedding layer of geomembrane's own shear strength.