Frare Gallant hired Menard Canada to improve the sites soil utilizing the Dynamic Compaction technique under the influence of the foundations of the various construction phases of the Innomalt project located on Jean Demers Avenue in Bécancour.
Geotechnical data extracted from drilling reports indicated the following soil profile:
- A gray silty clay with sand lenses over a thickness of around 2m.
- Silty sand with gray sandy silt beyond to a depth of about 12m
- A moraine of dense silty fine sand
- Rock at a depth of about 17m.
- A layer of organic soil on the surface (layer excavated during land clearing and preparation of the work platform).
- Fine brown to gray sand with traces of silt of loose consistency over a thickness of between 6m and 7.5m
- The water table was encountered around 2m deep
Menard Canada performed the Dynamic Compaction using a conventional crane equipped with masses varying between 15 and 20 tons to achieve the following performance criteria:
- Obtain a bearing capacity of 200 kPa ELUT and 300 kPa ELUL for the isolated or continuous footings shown in the structural plans
- Mitigate the potential for liquefaction over a depth of +‐ 8m when the soil is compactable. thus bringing the class of Sol to E.
The results of the 19 cone penetration tests (CPT), as well as the bearing capacity – settlement calculations and the analysis of the liquefaction potential, made it possible to validate the performance of the treatment.