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Views: 42 Author: Tony Wan Emai:admin@lianxiangcn.com Publish Time: 2022-01-22 Origin: Site
How to choose drainage materials for construction project?
Comparison of drainage filter mat, three-dimensional composite drainage net and gravel layer
High-strength percolationand drainage filter mat (geotechnical mat/drainage filter) is a drainage geomaterial made of industrial polypropylene (PP) or polyethylene (PE) as raw material with fused wire laying network. It has high pressure resistance, high open pore density, all-round water collection, horizontal drainage and other functions. The porosity of high-strength percolation and drainage filter mat can reach 80%, and the longitudinal permeability coefficient is ≥4.0×10-2m/s, which is more than ten times of geotechnical drainage network. The thickness of high-strength percolation and drainage filter mat is generally 8mm~150mm, and the compressive performance can reach 50kPa~600kPa under the condition of 10%~40% compression deformation.
Acting on the leachate infiltration layer at the bottom of the reservoir area of the landfill, it can completely replace the 30cm gravel layer with a compression and deformation rate of about 30% under the condition of bearing 150kPa pressure.
It can be used in landfill sealing system as surface water conductive layer and gas conductive layer, which can be applied to steep slopes, and its high conductive performance can remove seepage water and gas in time to ensure the stability of the slope. Lianxiang Engineering Materials Co.Ltd supply different kinds of this materials to meet construction need.
Features. 1、Construction is convenient and connected by nylon ties, which greatly saves manpower and working period. 2、Construction safety, no need for mechanical equipment operation, in line with the standard of finished product protection of impermeable parts. 3, Not restricted by local conditions, stable supply of raw materials, lower cost than gravel infiltration layer
High strength percolation and drainage filter mats are usually used as horizontal drainage layer in soft ground reinforcement by drainage consolidation method or vacuum pre-pressing method, slope drainage layer in water conservancy projects, tunnel drainage layer, leachate and groundwater conductive drainage layer in landfill, air conductive layer and drainage layer in landfill sealing, vegetation permeable drainage layer in garden projects, linear drainage blind trench, etc.
High-strength percolation and drainage filter mat is a chemical building material like geotechnical drainage network, and its raw material is chemical basic material, and the product is industrially produced with mature technology and stable quality. The permeability coefficient is more than ten times that of geotechnical drainage network, and dozens of times that of gravel matting, while its thickness can be several times that of geotechnical drainage network, so it is an ideal substitute for gravel or sand filter layer and geotechnical drainage network as drainage material. The product is a coil or sheet, which can be laid flat in the construction of the project, and the net core is connected by tying, while the geotextile is connected by sewing, making the construction difficult and efficient. The high-strength percolation and drainage filter mat also has a certain reinforcing effect, which is an ideal material for soft ground treatment. It is significantly better than gravel or sand filter layer and geotextile drainage network in drainage performance, and at the same time, the product has strong horizontal reinforcement performance and compressive performance. It is especially suitable for the construction of the bottom of landfill reservoirs, and has good drainage conductivity under waste load without damaging the impermeable materials. The product compound double-sided geotextile has a backfiltering effect, and the drainage channels are not easily blocked, and the product is highly durable. The finished product is a coil or sheet, with small density and light weight, so it is less difficult to transport and construct, and the operation cost is low. Except for individual fields, it can fully replace gravel or sand filter layer and geotechnical drainage network.
It is a new type of drainage geomaterial. It is made of high-density polyethylene (HDPE) and processed by a special extrusion molding process, and has a three-layer special structure. The middle bars are rigid and arranged longitudinally to form a drainage channel, and the cross-arranged bars above and below form a support to prevent the geotextile from embedding in the drainage channel, so that it can maintain high drainage performance even under very high loads.
Double-sided adhesive permeable geotextiles are used in combination, and geotextiles can be divided into long-filament geotextiles and short-filament geotextiles. It is the most ideal drainage material with the comprehensive performance of "counter filtration - drainage - ventilation - protection". Product use: mainly used in railroad, highway, tunnel, municipal engineering, reservoir, slope protection and other drainage projects with significant effect.
Lianxiang Engineering Materials Co.Ltd supply different kinds of this materials.
Product features:
1. strong drainage (equivalent to one meter thick gravel drainage). 2. high tensile strength. 3. reduce the chance of geotextiles embedded in the core of the mesh, maintaining long-term stable drainage. 4. withstand high pressure loads for a long time (can withstand compression loads of about 3000 Ka). 5. corrosion resistance, acid and alkali resistance, long service life. 6. easy construction, shorten the construction period, reduce costs.
| Property | Gravel or sand filter layers | 3D Composite drainage net | Drainage filter mat |
|---|---|---|---|
| Longitudinal permeability coefficient | ≥1.0×10-3m/s | ≥3.0×10-3m/s | ≥4.0×10-2m/s |
| Horizontal water conductivity | Dense material, small porosity, average horizontal water conductivity | High horizontal hydraulic conductivity per unit, thin thickness , average horizontal hydraulic conductivity | High horizontal water conductivity per unit, thickness up to 10mm~100mm, good horizontal water conductivity |
| Permeability stability | Material needs to be dense, small particle gap, easy to block failure | Large grid gap, not easy to block, good infiltration stability | Large gap of messy wire, harder to plug, good permeation stability |
| Compression resistance | Related to the denseness of the material, generally up to 120kPa | The material has strong compressive properties up to 400kPa | 100~600kPa |
| Horizontal reinforcement performance | None | High | High |
| Foundation deformation adaptability | Dispersed granular material, foundation deformation is prone to local deficiencies and failure of drainage capacity | Continuous, high adaptability to foundation deformation | Continuous, high adaptability to foundation deformation |
| Safety work with impermeable materials | More angles, easy to pierce the impermeable material, highly susceptible to quality problems | Flat sheet, no damage to impermeable materials, general isolation effect | Flat sheet and flexible, no damage to impermeable materials, suitable for use in environments with sharp objects or complex piles of materials. |
| Laying thickness | Not less than 300mm | According to sheet thickness, generally 5mm~8mm | According to sheet thickness, generally 8mm~300mm |
| Construction efficiency | Lower efficiency-Large volume, difficult operation, especially on impermeable materials can not use large machinery, construction quality is difficult to ensure | High efficiency-Sheet laying, tie and stitching between coils, | High efficiency-Sheet laying, tie and stitching between coils- |
| Cost and material | Materials are restricted by local conditions, quality control is difficult and the cost is high | Chemical building materials, industrial production, stable quality and lower cost | Chemical building materials, industrialized production, stable quality, lower cost |
| Function | Drainage layer, suitable for longitudinal and horizontal drainage | Drainage layer and soil horizontal reinforcing material, suitable for longitudinal and horizontal drainage | Drainage layer, suitable for longitudinal and horizontal drainage |
| Project | Application | Gravel or sand filter layers | 3D geocomposite drainage net | Drainage filter mat |
|---|---|---|---|---|
| Road/pavement | Road base drainage | ★ | ★★ | |
| Drainage at the top of the tunnel | ★ | ★★ | ||
| Hydraulic and Geotechnical Engineering | Slope drainage reinforcement | ★ | ★★ | |
| Soft ground drainage consolidation (vacuum pre-pressure) horizontal drainage layer | ★ | ★ | ★★ | |
| Reduced dike infiltration surface | ★ | ★ | ★★ | |
| Environmental Sanitation project | Landfill groundwater drainage layer | ★ | ★ | ★★ |
| Landfill Leachate Drainage Layer | ★ | ★ | ★★ | |
| Landfill closure gas-conducting layer | ★ | ★ | ★★ | |
| Landfill closure drainage layer | ★ | ★★ | ★★ | |
| Landscape project | shaping terrain stability | ★ | ★★ | ★★ |
| Vegetation permeable and drainage layer | ★ | ★★ | ★★ | |
| Roof garden anti-seepage protection layer | ★ | ★★ | ★★ | |
| Linear blind drain | ★ | ★★ | ||
| Others | Drainage and stabilization of stockpile body | ★★ | ★★ |