Three-Dimensional Composite Drainage Network With Excellent
Drainage Performance
Definition and Composition
Three-dimensional composite drainage network is a new type of
drainage geotechnical material, which is composed of a
three-dimensional geotechnical mesh core with needle-punched
perforated non-woven geotechnical fabric adhered to both sides. The
structure of this material consists of a thick vertical rib and one
diagonal rib at the top and bottom.
Function and Purpose
The main function of the three-dimensional composite drainage
network is drainage, and it can also play the role of isolation and
foundation reinforcement. It can withstand high compressive loads
throughout the use process and maintain a considerable thickness,
providing good water permeability. In addition, it has the
characteristics of corrosion resistance, acid and alkali
resistance, and long service life.
The main uses of three-dimensional composite drainage networks
include drainage in landfills, roadbeds, and tunnel interiors. Due
to its unique three-dimensional structure and excellent drainage
performance, it is also commonly used in environmental protection
projects such as landfills.
Construction Requirements
Before laying the three-dimensional composite drainage net, the
foundation needs to be treated, including leveling and compaction
of the lower layer, with a flatness requirement of no more than
15mm and a compaction degree meeting the design requirements.
During laying, the direction with high main strength of the
reinforcement material should be perpendicular to the axis of the
road embankment. The overlapping length (longitudinal) of each
section shall not be less than 15cm, and it should be fixed with
U-shaped nails or connectors, with a spacing of 1.0m. The
transverse overlapping length should be 30 to 90cm, and the
overlapping position should be fixed with U-shaped nails or nylon
rope.
Performance Indicators
The main technical indicators of the three-dimensional composite
drainage network include the unit area mass of the composite, the
unit area mass of the non-woven fabric, the thickness of the
composite, the thickness of the core, the longitudinal tensile
strength of the composite, the transverse tensile strength of the
composite, the longitudinal and transverse tensile strength of the
core, the peel strength between the core and the non-woven fabric,
and the water permeability of the composite.
Conclusion
In summary, three-dimensional composite drainage network is an
efficient and durable drainage material with extensive applications
in environmental protection projects and road construction.
Product Specification and Technical Index
| Drainage network core | Specification |
| Unit Weight(g/m2) | 750 | 1000 | 1300 | 1600 | 1800 |
| Thickness(OV=20pa, mm) | 5.0 | 6.0 | 7.0 | 7.6 | 8.0 |
| Hydraulic Conductivity(m/s) | K×10-4 | K×10-4 | K×10-3 | K×10-3 | K×10-3 |
| Elongation Rate(%) | < 50 | < 50 | < 50 | < 50 | < 50 |
| Tensile Strength(core network, KN/m) | 8 | 10 | 12 | 13 | 14 |
| Geotextiles(g/m2) | 200-200 | 200-200 | 200-200 | 200-200 | 200-200 |
(CJ/T 452—2014)
| Project | Index |
| Geotechnical drainage network | Geotechnical composite drainage network |
| Density/(g/cm³) | ≥0.939 | — |
| Carbon Black Content (%) | 2~3 | — |
| Longitudinal Tensile Strength/(KN/m) | ≥8.0 | ≥16.0 |
| Longitudinal Hydraulic Conductivity (Normal Load 500KPa, Hydraulic
Gradient 0.1)/(㎡/s) | ≥3.0×10-3 | ≥3.0×10-4 |
| Peel Strength/(KN/m) | — | ≥0.17 |
| Mass Per Unit Area Of Geotextile/(g/㎡) | — | ≥200 |
