1. The composite geotechnical drainage net is a new type of geosynthetic material made of random metal wires melted and laid. It has high pressure resistance, large opening density, and has the functions of all-round water collection and horizontal drainage.
2. After the composite geotechnical drainage net is combined with the non-woven geotextile, the rainwater infiltrated into the soil covering layer or the sewage discharged from the yard itself can be collected under the buried closed covering layer, and its unique drainage function can be used. According to the project, orderly discharge from the geomat interlayer is required without the formation of silt. The possible slippage problems due to water saturation of the soil cover are thus avoided.
3. The composite geotechnical drainage pipe network can not only discharge water, but also discharge biogas (especially waste) produced by fermentation in the soil, which is especially suitable for use in landfills.
4. When the composite geotechnical drainage net is used in combination with HDPE, it can also protect the HDPE membrane from being punctured.
5. Specification and performance of composite geotechnical drainage pipe network. The composite geotechnical drainage net is currently 100cm-200cm wide, 6cm-20cm thick, and has a compressive strength of 250-1000kpa. Products with other specifications and performances can be customized according to engineering requirements.
Construction method:
1. First, clean up the construction site without floating soil, stones, concrete protrusions or other sharp objects.
2. Lay anti-seepage drainage boards on site according to design requirements. When the length of the drainage part exceeds the length of the seepage drainage sheet, it needs to be connected. The connection method adopts Velcro, and the distance between the Velcro is 8-10cm. No connections are required in the width direction.
3. Install water guide blocks at retaining walls or railings. The water guide block mainly plays the role of collecting rainwater and draining the water in the drainage holes. The water guide block is cut from a plastic anti-seepage sheet with a width of 100-200mm and a thickness of 50mm. The installation length is determined according to the width of the drainage site.
4. After the drainage pad and the water guide block are installed, lay the geotextile. When two pieces of geotextile are overlapped, the overlap width should not be less than 200mm.
5. When the geotextile is laid on the parapet or retaining wall, it should be rolled up to exceed the height of the water guide block h (mm), generally h=100 ~ 150mm. Fold the geotextile in half and fix it on the guardrail (or retaining wall) with the geotextile strap.