Specifying a foundation depth in Portlaoise without knowing the soil's friction angle is a gamble that backfires during excavation. The town sits on a complex blanket of Irish glacial till, with pockets of soft alluvium along the Triogue River floodplain. A standard borehole log gives you a description, but it does not give you the effective stress parameters needed to prevent a basal heave failure or a bearing capacity issue. We run the triaxial test to quantify cohesion and friction angle under controlled drainage conditions. For embankments on the M7 or deep excavations near the town centre, combining this data with in-situ permeability testing ensures your dewatering plan matches the real ground conditions, not just an assumption from a desk study.
Effective stress parameters from a triaxial test are not just numbers for a PLAXIS model; they are your insurance against a shear failure in Portlaoise's overconsolidated tills.
