Drainage within the soil
Vertical drains provide a controlled drainage path through suitable saturated, compressible soils.
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Osborne Contractors / Wick drains
WICK
DRAINS.
Move consolidation
into the construction plan.
Prefabricated vertical drains help soft, compressible soils consolidate faster under preload or surcharge. Osborne Contractors installs wick drains as part of a site-specific ground improvement program.
Installation. Drainage. Surcharge. Monitoring.
Consolidation / section01
Illustrative wick drain cross-sectionTemporary surcharge lies above a drainage blanket and soft compressible soil. Water flows toward vertical drains, up to the drainage blanket, and out through a designed outlet. The drawing is illustrative and not to scale.SURCHARGE / PRELOADSOFT, COMPRESSIBLE SOILTO OUTLETVertical drainWater flow
A shorter path for pore water
Designed to accelerate
soil consolidation.
Wick drains combine a drainage core with a geotextile filter. Under loading, excess pore water enters the drain and travels to a drainage layer, shortening the path through low-permeability soil.
Loading at the surface
Preload or surcharge provides the load. The drain system helps the soil respond more quickly as excess pore pressures dissipate.
Progress measured on site
Settlement and pore-pressure readings help the geotechnical engineer assess consolidation and determine when the next stage can proceed.
From layout to verification
Installation with
a clear sequence.
The installation plan brings the ground investigation, drain specification, site access and loading sequence together.
Explore ground improvementsReview the design
Confirm the engineer’s drain grid, target depths, materials, acceptance criteria and monitoring requirements.
Prepare the work area
Establish access and a suitable working platform. Coordinate the drainage blanket or other specified collection system and outlets.
Install the drains
A protective mandrel carries each drain to the specified depth. The drain is anchored, and the mandrel is withdrawn, leaving the drain in place.
Load and monitor
Place preload or surcharge in the specified stages. Review monitoring results against the engineer’s criteria before removing surcharge or advancing construction.
Where wick drains fit
Soft ground.
Planned development.
Suitability depends on soil conditions, available time and project settlement requirements.
- Embankments and transportation corridors over compressible soils.
- Industrial and commercial sites requiring preconstruction consolidation.
- Large fill areas where drainage and surcharge can be coordinated.
Start with the right information
Plan the work
around the ground.
Send your geotechnical report and plans so we can discuss installation scope, access and sequencing with your project team.
- Soil profile and groundwater conditions
- Drain spacing, depth and material specification
- Working platform, access and overhead clearance
- Drainage outlets and surcharge staging
- Settlement targets, monitoring and schedule
Common questions
Before you
break ground.
Are wick drains structural piles?
No. Wick drains provide drainage to accelerate consolidation. They do not act as structural piles carrying building loads.
Do wick drains eliminate settlement?
No. They accelerate consolidation under load so more settlement can occur before the permanent works. Residual settlement must be evaluated by the geotechnical engineer.
How are spacing and depth selected?
The geotechnical engineer selects the layout using site investigation, loading, soil behavior and schedule requirements. There is no single spacing or depth that fits every site.
Your next project
LET’S TALK
ABOUT YOUR SITE.
Have a question or a project ready for review? Talk with Osborne Contractors.
Request a quoteBring your plans.
We’ll discuss the installation scope and how wick drains fit the project’s ground improvement sequence.
Office (504) 304-5578info@osbornecontractors.com
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