Methodology
Our standard penetration test methodology in Regina follows ASTM D1586, with a safety hammer and automatic trip system to minimize energy variability. We perform SPT at 1.5 m intervals to depths of 20–30 m, depending on project requirements. Soil samples are retrieved with a split-spoon sampler for visual classification and laboratory testing, including moisture content and Atterberg limits. For detailed profiling, we integrate SPT with cone penetration test (cpt) to correlate blow counts with continuous tip resistance. Data reduction includes energy correction to 60% (N60) and application of overburden correction factors per NBCC 2020. Our reports present SPT logs with measured N-values, soil descriptions, and interpreted geotechnical parameters for foundation design.
Reference Technical Parameters
| Parameter | Reference Value |
|---|---|
| Predominant soil type | Glacial till (silty clay with gravel) |
| Maximum seismic acceleration (PGA) | 0.2–0.3 g (NBCC 2020, Site Class D) |
| Typical groundwater level | 3–8 m below ground surface |
| Bedrock depth | 10–30 m (Upper Cretaceous shale) |
| Typical N60 range | 10–50 blows/300 mm (varies with depth) |
Local Considerations — Regina
Regina's geology is dominated by glacial till overlying Cretaceous shale, with localized sand and gravel lenses. The water table is shallow in low-lying areas, affecting excavation and foundation design. Seismic hazard is moderate (PGA 0.2–0.3 g), requiring liquefaction assessment for saturated sands. The city's expansive clay soils demand careful consideration of foundation heave. Our team has extensive experience across Regina's neighborhoods, from downtown high-rises to residential subdivisions in the suburbs. For projects requiring a broader regional scope, our standard penetration test in Winnipeg provides additional coverage.
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Services in Regina
Applicable Standards
- ASTM D1586
- NBCC 2020 (National Building Code of Canada)
- CSA A23.3 (Concrete Design)
- Regina Zoning Bylaw (foundation requirements)
Frequently Asked Questions
What soil types are commonly encountered in Regina?
Regina's subsurface typically consists of glacial till—a heterogeneous mixture of silty clay, sand, and gravel—overlying Cretaceous shale. In some areas, lacustrine clay and silt deposits are present, along with buried sand channels. The till is often stiff to very stiff, with varying gravel content.
How is seismic design addressed for standard penetration test in Regina?
Per NBCC 2020, Regina is in seismic zone with PGA 0.2–0.3 g for Site Class D. SPT N60 values are used to assess liquefaction potential in saturated granular soils. Our testing follows ASTM D1586 with energy correction to N60, and we apply the simplified procedure (Youd et al., 2001) for liquefaction triggering evaluation.
Is standard penetration test mandatory for building permits in Regina?
While not explicitly mandated for all projects, the City of Regina requires geotechnical reports for buildings over 3 stories or with significant loads. SPT is the preferred method for determining bearing capacity and settlement parameters. Our firm provides SPT data that meets the city's submission requirements.