Wick Drain / Pre-Fabricated Vertical Drain
PVDs, also known as ‘Wick Drains,’ are made out of a plastic core covered in a geotextile and used to speed up the consolidation of slow-draining soils. They’re frequently used in conjunction with surcharging to speed up pre-construction soil compaction.
These prefabricated wick drains are used to reduce the preloading time by shortening the pore water travelling range. The goal is to expedite initial settlement. Wick drains that have been prefabricated can be used for a variety of other applications.
They might be used to lessen stack down drag or expand the retention capacity of future disposal sites and waste management facilities.
This technique involves the installation of artificial drainage paths or Prefabricated Vertical Drains into soft compressible soils. B. J. Geo-textile Limited has specially designed the technic of wick drains or Prefabricated Vertical Drains for high settlements.
Low permeable soil integrity is not suitable for heavy-load construction especially in structures like roads, bridges, ports, highways, railroads. For that, stabilizing saturated soil with the process of soft foundation using PVD is a commonly used technique. Prefabricated Vertical Drains (PVD)/ Wick drains conducts the water flow and helps the soil consolidation process.
Time settlement curve of soft clay showing significant time reduction achieved by applying PVD with surcharge loading.
PREFABRICATED VERTICAL DRAINs (Pvd)
Prefabricated Vertical Drains (PVDs), also known as wick drains, are made up of two-piece composite fabric comprising of an internal polymer center and an external nonwoven filter jacket. The external filter jacket has a very high water permeability and excellent filtration properties.
The inward center is made up of polypropylene fabric by nonstop extrusion technology and the extruded layered or fin-shaped profiles on both sides of the center give different channels for expansive water-powered stream within the longitudinal heading of the center indeed when distorted under significant pressures, vertical settlements or horizontal relocations.Â
Product specification
Function
- Speed up the primary consolidation process
- Reducing the surcharge load needed to get the same results with consolidation for a certain period of times
- Speed up the addition of soil shear strength due to soft soil consolidation.
APPLICATION
Vertical drains/ Wick drains technology has proven itself to be the best in hundreds of projects in the last thirty years. Over 1 billion linear metres of similar PVD have been installed worldwide to date for:
- Land reclamation projects.
- Construction of highways, railways, airfields and dykes.
- Ports and harbor construction.
- Development of industrial sites.
- Mitigation of liquefaction.
- Flood protection
PREFABRICATED VERTICAL DRAINs
Prefabricated Vertical Drains (PVDs), also known as wick drains, are made up of two-piece composite fabric comprising of an internal polymer center and an external nonwoven filter jacket. The external filter jacket has a very high water permeability and excellent filtration properties.
The inward center is made up of polypropylene fabric by nonstop extrusion technology and the extruded layered or fin-shaped profiles on both sides of the center give different channels for expansive water-powered stream within the longitudinal heading of the center indeed when distorted under significant pressures, vertical settlements or horizontal relocations.Â
Product specification
FUNCTION
- Speed up the primary consolidation process
- Reducing the surcharge load needed to get the same results with consolidation for a certain period of times
- Speed up the addition of soil shear strength due to soft soil consolidation.
APPLICATION
PVD technology has proven itself to be the best in hundreds of projects in the last thirty years. Over 1 billion linear metres of similar PVD have been installed worldwide to date for:
- Land reclamation projects.
- Construction of highways, railways, airfields and dykes.
- Ports and harbor construction.
- Development of industrial sites.
- Mitigation of liquefaction.
- Flood protection
Pre-Fabricated Vertical Drains (PVD) Product Details
B. J. Geo-textile Limited PVD, also called wick drain, is a pocket-style vertical drains (PVD) for the improvement of soft ground made from a mechanically strong PP core and a nonwoven filter jacket specialized for PVD application. The product quality of our wick Drains/ vertical drains is assured by many certificates including ISO 9001:2015Â etc.
Vertical Drains/ Wick Drains Installation Process
- An anchor plate is attached to the end of the PVDÂ
- PVDs are installed into the ground using a hollow mandrel that houses and protects the PVD materialÂ
- The mandrel is then hydraulically pushed into the ground by the installation rig by following the specifications established by the contractors engineering teamÂ
- Once the PVD has been driven to the correct depth and pressure the mandrel is then withdrawn back into the mast leaving the PVD in placeÂ
- The rig then moves to the next predetermined installation location and continues the processÂ
- The installation details for each PVD are verified by the operatorÂ
- Once the PVD installation has been completed a new surcharge layer of loading is applied to the siteÂ
- Once the PVD has been driven to the correct depth and pressure the mandrel is then withdrawn back into the mast leaving the PVD in placeÂ
This surcharge layer combined with the PVDs accelerates the consolidation of the subsoils over a few months as opposed to over a few years. Correctly installed vertical drains/ wick drains significantly reduce the settlement time allowing the construction process a far more cost-effective, safer, and faster timeframe than traditional methods.
Benefits of Wick Drain
The followings are indisputable benefits of PVD or Wick Drain:
- Preloading reduces the amount of time it takes to complete primary consolidation.
- Reduce the volume of surcharge needed to accomplish the appropriate level of recompression in the time allotted
- When stability is an issue, enhance the rate of power acquisition owing to soft soil consolidation.
- When compared to sand drains, it is economically competitive.
- Helps to reduced soil disruption compared to displacement sand drains.
- Implementation is quick and simple.
- It's also possible to place it in a non-vertical position.
- There's a better chance of a sustainable, uninterrupted vertical drainage route with no gaps caused by installation issues.
- Under vertical or horizontal ground movement, PVDs may sustain significant lateral displacement or buckling.
- It is possible to install at a quicker rate.
- PVDs can be installed at close intervals in situations where quick consolidation is required.
- PVDs are more easily deployed underwater and in a non-vertical configuration.
Uses of Wick Drain
These vertical strip drains are geo-composites utilized by government and non-government engineering businesses for land reclamation and soft ground stabilization. The drains’ efficiency is influenced in part by transmittance, or discharge capacity, which is tightly regulated during the production process and subjected to stringent quality control.
BJ. Geo-textile is an ISO 9001:2015Â certified firm that adheres to rigorous production standards from start to finish. PVDs (Prefabricated Vertical Drains) made it possible to…
- Soft soils are quickly consolidated with a preloaded fill or induced negative pressure.
- For staged loading or staged construction on soft soils, an expedited construction timetable is used.
- Roadway embankment dams
- Airports and seaports are two of the most important transportation hubs in the world.
- Highway interchanges and approaches to bridges
- Tanks for storing goods
- Embankments of railways
- Levees and dams
- Buildings for business and residential use
- Tailings and trash from the mining industry
Prefabricated Vertical Drain Installation Process
To guarantee a firm working station, the working ground must be prepared before installations can commence. Due to the delicate nature of vertical drain sites, a sand or gravel blanket may be required to give foundation for the equipment. Water will be directed off from the treatment zone by the sand and gravel, which will also function as a drainage cover.
According to the deployment depth, a customized pole made up of drain substance and a mandrel is installed on a track-mounted excavator or a crane. A track-mounted excavator can lay drains up to 140 feet deep. For stability, drains deeper than 140 feet frequently require the mast to be installed on a crane.
The PVD is threaded through the mandrel to prevent it from harm while being inserted in the soil. Depending on the soil conditions, installation force is often delivered by vibrating hammers, static force devices, or a combination of these methods. To lessen the resistance on the mandrel while installation, water can be used to grease it.
Why Choose B. J. GEOTEXTILE LIMITED?
B. J. Geo-textile Limited is a reputable supplier that conducts objective assessments and testing on your structures. We do a number of testing on Geotextile/Prefabricated Vertical Drains (PVD) to guarantee that your preconstruction soil consolidation through wicker drain installation goes well.
This will assist you in reducing the danger of project delays and accidents. Our engineers take an active role in the development of regulations and guidelines that regulate the safety of engineering constructions. This guarantees that they are well-versed in all applicable rules and regulations.
We have years of experience in the residential properties and infrastructure sectors on a national and global scale. In furthermore, we are ISO 9001:2015 registered to undertake quality assurance inspections independently.
FAQ
Vertical drains or also known as wick drains are used to shorten the dissipation path of the excess pore water and to accelerate the consolidation process to a few months or even weeks when the PVD is placed at close center to center distances.
The prefabricated vertical drains are made up of a core material, usually of plastic that is wrapped with the spun-bond non-woven geotextiles as an outer layer and acts as a filter fabric. The geotextile filters the soil from entering the water channels and flooding the drain.
A drainage blanket is a very permeable material used to remove water or to control groundwater seepage from cut slopes or beneath fills.
Conclusion
Installation monitoring systems are becoming more advanced as geo synthetics develop. In reality, with the addition of electronics to the installation equipment, PVD quality control has increased. B. J. Geo-textile Ltd. is delighted manufacturer of prefabricated vertical band drains (PVD), which are now being used to replace foreign items.
We’ve already started producing and distributing high-quality Vertical band drains to road construction experts from various companies. Our Prefabricated Vertical Drains (PVD) are built of high-quality Polypropylene resins supplied from top petrochemical businesses and have produced great final products that have been praised by implementing enterprises’ engineers.
The comprehensive details of our product will help you to get the best manufactured Wick Drain / Prefabricated Vertical Drain instantly at B. J. GEO-TEXTILE LIMITED. Therefore, if you are looking for the best kind feel free to contact us instantaneously.
Technial Datasheet for PVD W-90, PVD W-100 & PVD W-110
The range of B. J. Geo-textile Limited wick drain is available in a choice of filter fabric and core to suit various soil conditions and engineering practices.
For details, please download our full technical datasheet.
The product specifications are as follows:
Composite Drain
Test Parameter |
Unit |
Test Method |
W-90 |
W-100 |
W-110 |
|---|---|---|---|---|---|
|
Mass per linear Meter
|
g
|
-
|
90
|
100
|
110
|
|
Thickness
|
mm
|
ASTM D5199
|
4.3
|
4.4
|
5.02
|
|
Width
|
mm
|
-
|
102
|
101
|
101
|
|
Tensile Strength
|
kN
|
ASTM D4595
|
2.4
|
2.7
|
2.67
|
|
Elongation at Break
|
%
|
ASTM D4595
|
41.08
|
41.50
|
56.12
|
|
Elongation at 0.5 kN
|
%
|
ASTM D4595
|
1
|
1
|
1.2
|
|
Strength at 10 Elongation at kN
|
KN
|
ASTM D4632
|
1.8
|
1.9
|
2
|
Core
Test Parameter |
Unit |
Test Method |
W-90 |
W-100 |
W-110 |
|---|---|---|---|---|---|
|
Thickness
|
mm
|
ASTM D5199
|
4.1
|
4.2
|
5.03
|
|
Tensile Strength
|
kN
|
ASTM D4595
|
1.6
|
1.9
|
1.69
|
|
UV Spectroscopy
|
nm
|
Internal Method
|
273(PP)
|
273(PP)
|
273(PP)
|
Filter
Test Parameter |
Unit |
Test Method |
W-90 |
W-100 |
W-110 |
|---|---|---|---|---|---|
|
Mass per unit area
|
g/m2
|
ASTM D5261
|
93
|
92
|
92
|
|
CBR Puncture Resistance
|
N
|
ASTM D6241
|
481.63
|
473
|
486.96
|
|
Tensile Strength
|
kN
|
ASTM D4595
|
4.26
|
4.26
|
4.26
|
|
Tensile Strength (Grab)
|
N
|
ASTM D4632
|
567.35
|
562.48
|
565.46
|
|
Trapezoidal Tear Strength
|
N
|
ASTM D4533
|
223.36
|
221.33
|
226.63
|
|
Water Permittivity (Normal to the plane)
|
s-1
|
ASTM D4491
|
0.29
|
0.29
|
0.28
|
|
Water Permeability (Normal to the Plane)
|
cm/s
|
ISO 9001:2015 |
0.013
|
0.013
|
0.013
|
|
*The Characteristic Opening Size O95
|
m
|
ASTM D4751
|
<86.63
|
<86.63
|
<86.63
|
|
UV Spectroscopy
|
nm
|
Internal Method
|
273(PP)
|
273(PP)
|
273(PP)
|
