Selected Technique:
Controlled Modulus Columns (CMCs)
The project involved the construction of the extension of the Uniboard warehouse, located at 2700 Bd Jean-Jacques-Cossette in Val d’Or, Quebec. Due to the compressibility of the soils in place and in order to limit total and differential settlements, a Controlled Modulus Column (CMC) type reinforcement was designed to support the slab and the foundations of the expansion. Rated Till had indeed been successfully eliminated after the works.
Ground Conditions
Based on the geotechnical study report and laboratory tests, the general stratigraphy of the site was described below:
Topsoil and backfill:
- Clay and silt with a trace of sand
- Grey-brown, moist to saturated materials of a firm to stiff consistency
- Average thickness of 0.5m
- Cohesive Natural Soil
- Silty clay to Clay with some sil
- Soft consistency, then firm in dept
- Average thickness of 13.3m
- Probable rock intercepted around 19m deep compared to the level of the existing ground. It should be noted that from a depth of 14m, a denser layer than the cohesive natural soil seemed to be encountered
- The elevation of the land is between EL 33.89m and 34.4m. The water table was intercepted around elevation 33.3, or about 0.8 meters below the level of the TN
Note that a topographic survey was carried out on November 29, 2019, by ARP technical services. According to this survey, the natural terrain is between elevations 34.1m and 34.6m, in addition to an area south of the site at 36m.
Menard Canada Solution
Settlement Control
Under the slab on the ground:
- Less than 25mm of total settlement
- Less than 20mm of differential settlement
- SLS load is 50 kPa
- Slab top at geodesic elevation 304.95m
Foundations:
- Variable bearing capacity depending on the load cases
- Less than 25mm of total settlement
- Less than 20mm of differential settlement
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