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Geotextile is mainly used to replace the traditional granular material to build the inverted filter and drainage body. Compared with the traditional inverted filter and drainage body, it has the characteristics of light weight, good overall continuity, convenient construction, high tensile strength, corrosion resistance, good microbial erosion resistance, soft texture, good bonding with soil materials, high durability and weather resistance under water or in soil, and remarkable use effect And the geotextile also meets the conditions of general inverted filter materials: 1 Soil conservation: prevent the loss of protected soil materials, causing seepage deformation, 2 Water permeability: ensure the smooth drainage of seepage water, 3 Anti blocking property: ensure that it will not be blocked by fine soil particles.

The geotextile shall be provided with the product quality certificate when it is used, and the physical indicators shall be tested: mass per unit area, thickness, equivalent aperture, etc Mechanical indexes: tensile strength, tear strength, grip strength, bursting strength, bursting strength, friction strength of material soil interaction, etc Hydraulic indicators: vertical permeability coefficient, plane permeability coefficient, gradient ratio, etc Durability: aging resistance, chemical corrosion resistance The test shall be conducted by a qualified technical quality inspection department. During the test, relevant inspection items can be added or deleted according to the project needs and specific construction requirements, and a detailed inspection report shall be issued.
During the laying of geotextile, the contact surface must be kept flat without obvious unevenness, boulders, tree roots or other debris that may damage the geotextile When laying the geotextile, it should not be too tight to avoid excessive deformation and tearing of the geotextile during construction. Therefore, it is necessary to maintain a certain degree of tightness. If necessary, the geotextile can make the geotextile have uniform folds When laying geotextile: first lay the geotextile from the upstream of the wrapping section downward, and lay it block by block according to the number. The overlapping width between blocks is 1m. When laying the round head, due to the upper narrow and lower wide, special attention shall be paid to the laying, careful construction shall be carried out, and the overlapping width between blocks shall be ensured The joint between geotextile and dam foundation and the bank must be handled properly When laying, we must maintain continuity and never miss laying After the geotextile is laid, it cannot be exposed to the sun because the geotextile is made of chemical fiber raw materials Sunlight exposure will damage the strength, so protective measures must be taken.
Our protective measures in geotextile construction are: cover the paved geotextile with straw, which ensures that the geotextile will not be exposed to the sun, and also plays a better role in protecting the geotextile for later stone construction Even if the protective layer of straw mulch is added and the stonework construction is carried out on the geotextile, the geotextile shall be carefully protected In addition, the best construction scheme shall be selected for the construction method of stonework Our construction method is that, due to the high degree of mechanization of construction, the stone is transported by dump trucks. During the stone unloading, a special person is appointed to direct the vehicle to unload the stone, and the stone is unloaded outside the root stone trough The manual transfer tank must be handled with care to avoid damaging the geotextile First, row the whole stone along the bottom of the trench for 0.5m. At this time, many people can throw stones along the stone surface of the barrier carefully. After the trench is full, manually transfer the stones along the inner slope of the earth dam foundation. The width of the stone is the same as that required by the design. The stone shall be evenly raised during the stone dumping. The stone surface of the barrier along the inner slope shall not be too high If it is too high, it is not safe for the filament woven geotextile, and it may also slide down, causing damage to the geotextile Therefore, special attention should be paid to safety during construction When the flat stones are laid along the inner slope of the soil tyre to 2m away from the dam crest, the stones shall be laid up along the inner slope, and the thickness shall not be less than 0.5m. The stones shall be unloaded to the dam crest, and the stones shall be carefully dumped manually, and the stones shall be leveled while being thrown until they are leveled with the top of the earth dam Then, according to the design slope, the upper line shall be leveled to achieve the smooth top slope.
① Protective layer: it is the outermost layer in contact with the outside world. It is set to protect against the impact of external water flow or waves, weathering and erosion, freezing and damaging the ring and shielding the ultraviolet rays of sunlight. The thickness is generally 15-625px.
② Upper cushion: it is the transition layer between the protective layer and the geomembrane. Since the protective layer is mostly large pieces of rough materials and easy to move, if it is directly placed on the geomembrane, it is easy to damage the geomembrane. Therefore, the upper cushion must be well prepared. Generally, there is sand gravel material, and the thickness should not be less than 375px.
③ Geomembrane: it is the theme of seepage prevention. In addition to reliable seepage prevention, it should also be able to withstand certain construction stress and stress caused by structural settlement during use. Therefore, there are also strength requirements. The strength of geomembrane is directly related to its thickness, which can be determined through theoretical calculation or engineering experience.
④ Lower cushion: laid under the geomembrane, it has dual functions: one is to remove water and gas under the membrane to ensure the stability of the geomembrane; the other is to protect the geomembrane from the damage of the supporting layer.
⑤ Support layer: the geomembrane is a flexible material, which must be laid on a reliable support layer, which can make the geomembrane stress evenly.