In Calgary, geotechnical investigation is the critical first step to manage risk around the complex glacial till, river valley sediments, and potential bedrock variability. Our category covers field programs designed to meet Alberta Building Code requirements and local geohazard protocols, from shallow reconnaissance to deep stratigraphic profiling. We rely on targeted methods like the exploratory test pit for visual inspection of fill and groundwater in accessible areas, and the cone penetration test (CPT) to continuously log soft soils and detect shear strength changes without cuttings.
These investigations support foundation design for residential subdivisions, tower cranes, and infrastructure on the Bow and Elbow River floodplains. For projects requiring direct sampling and strength indices in stiff clays or dense sands, we combine the above with the standard penetration test (SPT) to calibrate borehole logs. A well-scoped investigation minimizes over-engineering and delays in Calgary’s variable subsurface conditions.
Design of corrosion-protected, post-tensioned anchors for retaining walls, foundations, and slope stabilization. Includes bond length optimization, lock-off load calculation, and creep analysis.
Cost-effective anchor systems for excavation support during construction. We size tendons for short service life, using conservative bond stresses and proof-testing protocols to meet safety codes.
On-site pullout testing per ASTM D4435, including proof load, creep monitoring, and acceptance criteria. We provide real-time data to confirm design assumptions before the contractor proceeds.
NBCC 2020 – Seismic and geotechnical provisions for anchored systems, CSA A23.3-19 – Design of concrete structures (anchor bond and load transfer), CSA S6-19 – Canadian Highway Bridge Design Code (anchor factor of safety), ASTM D4435-13 – Standard test method for anchor pullout resistance
For a standard project with up to 20 anchors, the design and verification testing typically falls between CA$1,570 and CA$5,200, depending on site complexity, number of test anchors, and reporting requirements. Larger or more complex scopes may exceed this range.
Bond length is calculated using the interface shear strength from triaxial tests on undisturbed samples, adjusted for installation method and grout quality. We apply a factor of safety of 2.0 for permanent anchors and verify with on-site pullout tests to confirm the design value.
For permanent anchors in aggressive groundwater conditions, such as those along the Bow River, we specify Class II corrosion protection per CSA A23.3. This includes a fully encapsulated tendon with a corrugated plastic sheath and cementitious grout cover.
Yes, we incorporate seismic load combinations from NBCC 2020, including peak ground acceleration values for Calgary's site class. The anchor capacity is checked under seismic loading with a reduced factor of safety of 1.2, and the bond length is increased if the seismic demand exceeds static capacity.