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Soil resistance is one of the most important factors in setting up the foundations of your home.

Why calculate soil resistance?

Calculating soil resistance is very important in a building. Indeed, this step, which is an integral part of the soil study, makes it possible to determine how the terrain is resistant to a load (translated into MPa, 1 MPa represents approximately 10 kg / cm 2). This study of the resistance of the soil makes it possible to set up adapted foundations, which ensure the sitting of the house. Foundations must be adapted to the nature of the soil and subsoil in order to avoid risks such as:

  • sagging, slipping or tilting part of the house,
  • the curvature exterior walls,
  • the cracks at the masonry joints, or directly across the walls.

If the soil resistance is well calculated, the foundations are then planned so as to perfectly transmit the weights and overloads to the ground.

How to calculate soil resistance?

The calculation of the soil resistance is done by a geotechnician. The geotechnician has a variety of tools to calculate the ground resistance, such as the vane, pressuremeter or penetrometer. The most commonly used tool is the penetrometer. This tool comprises a rod which, once pushed into the ground, determines the resistance of the ground with respect to this depression.

The calculation of soil resistance takes into account the physical and mechanical characteristics of the soil and subsoil on which the foundations will rest.

Depending on the result, different solutions can be considered as to the foundations of the house. In the majority of cases, the load of the house is distributed on running soles. These are particularly suitable for soils with good backfill. For homogeneous but unstable soils, a slab can be set up. The raft is a concrete slab located under the entire construction, and on which the loads are evenly distributed.

Video Instruction: AEMC® - Understanding Ground Resistance Testing