Wick Drains

Dual Core Integrated Wick Drain

Wick drains, also known as Prefabricated Vertical Drains (PVD), significantly increase the speed of consolidation of soft compressible soils and improve the shear strength prior to construction. Wick drains consist of a prefabricated geotextile filter-wrapped plastic strip with molded channels. In recent years dual core integrated wick drains have outperformed traditional wick drains made from separate cores and geotextile filter socks. Prefabricated Vertical Wick Drains are used throughout Asia to increase the drainage paths within the soil to be consolidated on hundreds of industrial and commercial development projects including tailing ponds and leach pads.

Dual core wick drains feature an extruded polypropylene core that allows maximum water flow and a high quality non-woven geotextile filter bonded to both sides to maintain effective filtration. The dual core integrated structure  withstands installation stresses and offers improved filtration and drainage.

Wick drains are inserted into the soil through a hollow mandrel mounted on an excavator or crane mast. At the bottom of the mandrel, the PVDs are connected to an expendable anchor plate. A vibratory hammer or static method is used to force the mandrel to the design depth. The mandrel is then removed, leaving the wick drain in place.

A pattern of installed vertical wick drains provides short drainage paths for pore water, which accelerates the consolidation process and the construction schedule. The speed of consolidation can be increased by laying heavy concrete or other blocks on the above ground surface.

Typical Values
Item Unit Type A Type B Type C Test Method
Dual Drain Core PE/white
Bonded geotextile filter PET/white
Width mm 98+/-1 98+/-1 98+/-1 ASTM D3774
Thickness mm >4.0 >4.5 >5.0 ASTM D5199
Tensile Strength(Dry state) KN/Core width >=2.0 >=2.4 >=2.8
Lengthways Discharge Capacity @ 350 kPa cm3/s >=60 >=70 >=80 ASTM D4716
Lengthways Discharge Capacity @ 350kPa(buckled) cm3/s >=40 >=50 >=60
Transverse Discharge Capacity l/s >=1×10-1
Tear Strength (Lengthways) N >=70 >=70 >=70 ASTM D638
Puncture Strength N >=400 >=400 >=400
Composite repellence break N/M No Rupture, No Peel off
Filter Fabric Weight g/m2 105~120 >=105~120 105~120
Thickness mm 0.28~0.32
Lengthways tensile strength(dry state) N/cm >=25 >=30 >=30 ASTM D638
Transverse tensile strength(wet state) N/cm >=25 >=25 >=25 ASTM D638
Filter permittivity cm/s >=5.0×10-3 At water 24hours
Apparent Opening Size mm <=0.10
Roll Width mm 98
Roll Weight kg 30

 

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