Project Description

Menard developed the Controlled Modulus Columns (CMC) technique more than 30 years ago.
Initially to overcome problems of lateral confinement in highly compressible and organic soils, we use it now in all types of soil (cohesive or granular).

Presentation and key elements

What is it?

Controlled Modulus Columns (CMC) are used to improve the mass properties of compressible soils to reduce their compressibility using a grid of rigid inclusions. Rigid inclusions are installed using a simple and efficient process with or without soil displacement during drilling. Grout or concrete is injected at low pressure through the hollow stem of the drilling tool. CMC diameters are generally between 280 to 450 mm

When and why use it?

The objective of this solution is to provide an equivalent improved soil mass stiffness to globally reduce total and differential settlements by sharing loads of the structure between the ground and the CMCs. There is no limitation in use for any type of weak grounds, including soils with significant organic content (peat, organic clays, etc) and the technique can uniformly support slab-on-grade and shallow footings, spread footings, strip foundations and retaining walls. The use of a rigid inclusion ground improvement enables to reduce the cost of the structure (decrease of concrete thickness and steel reinforcement). The entire process is vibration-free and does generate a very limited amount of surface spoil, which allows a cleaner job environment and limits the risk of contamination.
They are an economical alternative to traditional deep foundation solutions and in most cases, can prove to be beneficial for the global design of the overlying structure.

💡 Menard’s tip

Our CMC can provide significant savings on both cost and time over more traditional techniques.

CMC techniques for soil

Our CMC projects