Drummondville sits at roughly 85 metres above sea level on the St. Francis River floodplain, where thick layers of soft clay and silty sand dominate the subsurface. The flat dilatometer test (DMT) offers a quick, repeatable way to measure lateral earth pressure, deformation modulus, and overconsolidation ratio in these fine-grained deposits. Before we deploy the blade, we often cross-check stratigraphy with a MASW-Vs30 survey to map stiffness contrasts across the site. Our team follows ASTM D6635 (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4), pushing the blade at 20 mm/s while recording A and B readings at 200 mm intervals. This method delivers continuous profiles that help engineers design foundations, retaining walls, and embankments with confidence in Drummondville.
The DMT delivers continuous profiles of lateral stress and modulus, making it a reliable tool for soft clay sites along the St. Francis River floodplain.