Methodology
Our DPSH Dynamic Probing follows the Australian standard AS 1289.6.3.2, using a 63.5 kg hammer dropped 760 mm to drive a 50 mm diameter cone. Penetration resistance is recorded as blows per 100 mm (N10), with typical refusal at 100 blows/100 mm or if negligible advance occurs after 20 blows. Data is corrected for rod length and energy efficiency per the manufacturer's calibration. The test provides continuous profiles to depths of 10–15 m, depending on ground conditions. For complementary methods, see our Cone Penetration Test (CPT).
Reference Technical Parameters
| Parameter | Reference Value |
|---|---|
| Hammer weight | 63.5 kg |
| Drop height | 760 mm |
| Cone diameter | 50 mm |
| Recording interval | 100 mm (N10) |
| Typical max. depth | 10–15 m |
Local Considerations — Australia
Australia's diverse geology—from the alluvial plains of Melbourne and Brisbane to the cemented sands of Perth and the reactive clays of Adelaide—requires adaptive DPSH protocols. In coastal areas like Gold Coast and Sunshine Coast, high water tables can reduce penetration resistance, requiring correction factors. In seismic zones such as Canberra and Newcastle, DPSH data is used for liquefaction assessments. Our team tailors test spacing and depth to local conditions, ensuring reliable data for foundation design in cities like Sydney, Wollongong, and Darwin. For Adelaide-specific services, see our Adelaide page.
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Our team reviews your project and issues an initial report at no cost.
Or write us directly at contact@standardpenetrationtest.org
Applicable Standards
- AS 1289.6.3.2: Soil strength and consolidation tests – Determination of the penetration resistance of a soil – 9 kg dynamic cone penetrometer test
- AS 1289.6.3.1: Determination of the penetration resistance of a soil – Standard penetration test (SPT)
- Eurocode 7: Geotechnical design – Part 2: Ground investigation and testing (used as reference for interpretation)
Frequently Asked Questions
What is the difference between DPSH and DPL dynamic probing?
DPSH uses a 63.5 kg hammer with 760 mm drop, while DPL uses a 10 kg hammer with 500 mm drop. DPSH is suitable for dense soils and deeper profiles, whereas DPL is used for shallow, low-resistance soils. Both follow AS 1289.6.3.2.
How is DPSH data interpreted for foundation design?
Blow counts (N10) are correlated with relative density and friction angle via established empirical relationships (e.g., Meyerhof). Corrections for overburden pressure and water table are applied. Results are used to estimate bearing capacity and settlement for shallow foundations.
What is the typical turnaround time for DPSH results?
Field testing is completed within one day for most sites. Preliminary logs are provided within 24 hours, and final interpretation reports are delivered within 5 business days, subject to site accessibility and number of test points.
How much does DPSH Dynamic Probing cost in Australia?
Costs range from $1,940 to $6,480 depending on depth, number of tests, site accessibility, and reporting requirements. This range covers mobilisation, testing, and a basic interpretation report. Contact us for a site-specific quote.