Methodology
Our CPT methodology adheres to AS 1289.6.3.1 and ASTM D5778, utilizing a 20-tonne truck-mounted rig with a 60° conical tip (10 cm² cross-section) advanced at 20 mm/s. The cone measures tip resistance (qc) up to 50 MPa and sleeve friction (fs) to 0.5 MPa, with pore pressure (u2) recorded via a porous filter. Data is logged at 1 cm intervals to depths of 40 m in soft soils. For stiff clays or dense sands, we deploy a 15 cm² cone with enhanced capacity. Our team processes results using software calibrated against local calibration chamber tests, ensuring accurate soil classification and undrained shear strength estimates (Su = 0.2–1.0 MPa). We also offer seismic CPT for shear wave velocity profiling, critical for dynamic analyses. Complementary services include Standard Penetration Test (SPT) for comparison.
Reference Technical Parameters
| Parameter | Reference Value |
|---|---|
| Tip Resistance (qc) | 0.5 – 50 MPa |
| Sleeve Friction (fs) | 0.01 – 0.5 MPa |
| Pore Pressure (u2) | -0.1 – 2.0 MPa |
| Penetration Rate | 20 mm/s ± 5% |
| Maximum Depth | 40 m (soft soils) |
Local Considerations — Australia
Australia's diverse geotechnical conditions require tailored CPT approaches. In Sydney, the presence of Hawkesbury Sandstone necessitates pre-drilling or seismic CPT to penetrate cemented layers. In Melbourne, the Coode Island Silt demands high-resolution pore pressure measurements for consolidation analysis. In Brisbane, residual soils over basalt require careful evaluation of tip resistance for excavation stability. Our firm adapts testing protocols per region: in Adelaide, we use larger cones for calcareous sands; in Perth, we prioritize seismic CPT for liquefaction assessment. This regional expertise ensures reliable data for foundations, embankments, and tunneling projects across all covered cities, including Adelaide, Brisbane, and Bunbury.
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Applicable Standards
- AS 1289.6.3.1 – Soil strength and consolidation tests: Determination of cone resistance
- ASTM D5778 – Standard Test Method for Electronic Friction Cone and Piezocone Penetration Testing of Soils
- Eurocode 7 (EN 1997-2) – Geotechnical design: Ground investigation and testing
- AS 1726 – Geotechnical site investigations (reference for interpretation)
Frequently Asked Questions
What is the difference between CPT and SPT?
CPT provides continuous profiles of tip resistance and sleeve friction, while SPT offers discrete blow counts at intervals. CPT is faster and less disturbed but cannot penetrate gravel or rock. SPT is preferred for obtaining soil samples. Our firm uses both methods synergistically, with CPT ideal for soft to medium soils and SPT for harder strata.
How deep can a CPT test reach in typical Australian soils?
Maximum depth depends on soil resistance. In soft clays, CPT can reach 40 m with a 20-tonne rig. In dense sands or stiff clays, depth may be limited to 20–30 m. Pre-drilling or using a larger cone can extend depth. Our team assesses site conditions to recommend optimal equipment for each project.
What is the typical turnaround time for CPT results?
Field testing for a 20 m sounding takes about 1–2 hours. Preliminary data is available onsite, with final reports including soil classification and parameters delivered within 5–7 business days. For urgent projects, expedited reporting is available at no extra charge.
How much does Cone Penetration Test (CPT) cost in Australia?
Costs range from $4,860 to $8,100 per test, depending on depth, accessibility, number of soundings, and site conditions. This includes mobilization, testing, and a full geotechnical report. For an accurate quote, we recommend contacting our team with project specifics. Prices are indicative for 2026.