Menard Vacuum™

1

What is Menard Vacuum™?

Menard Vacuum™ is used to accelerate consolidation of cohesive, highly compressible soils. The process consists in creating a negative pressure under an airtight membrane laid over the soil, which generates atmospheric pressure on the soil, equivalent to the pressure exerted by a 4 metre embankment.

2

How long does it take to implement the technique?

It generally takes between 1 and 3 months between start of the project and the creation of the Menard VacuumTM negative pressure (the time needed to install the vertical drains, horizontal drains, instrumentation, airtight membrane, trench around the site).

FAQ

What are the advantages of the technique?
This technique can substantially reduce consolidation time thanks to early pre-loading as soon as the system is in place and without risk of ground failure. The isotropic nature of the Menard Vacuum™ load and the “artificial beam” generated by the vacuum between the horizontal drains and the membrane have a strong stabilising effect on the fill.

What surface area is needed to install this technique?
The technique is rarely used on surface areas of less than 10,000 m².

Does Menard Vacuum™ lower the water table?
During the entire pumping operation, the water table is maintained at the level of the horizontal drain network. The process does not lower the water table within or around the worksite. The system pumps only the volume of water expelled by the soil during consolidation settlement and the residual flow necessary to maintain the vacuum.

Some projects' references of...
Menard Vacuum™

Fisherman Island, Port of Brisbane, Queensland, Australia

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Jangyoo sewage treatment plant, South Korea

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Remediation of the « Stade de France » in Saint-Denis, France

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