How deep can CPT testing reach?

Typically up to 30 m depending on ground resistance; refusal occurs earlier in dense or cemented materials, at which point DPSH is used as a complementary method.

Can CPT be performed inside a building or basement?

Yes. Our modular rig can be disassembled and reassembled in constrained spaces. At the Halls of Justice site, GID anchored through an existing reinforced concrete slab to achieve the necessary reaction force.

Does CPT replace the need for soil samples?

Not entirely, as detailed laboratory testing on undisturbed soil is the industry gold standard for identifying design parameters. Our rigs however, are capable of both disturbed and undisturbed sampling.

Cone Penetration Testing

ASTM D5778-20

GID’s primary method for continuous, high-resolution ground characterization with real-time pore-water pressure measurement delivers the data foundation designers rely on.

What Is CPTu?

Cone Penetration Testing (CPTu) is performed by advancing an instrumented cone into the ground at a controlled rate of 2 cm/s. Rather than relying on isolated samples, integrated sensors continuously measure tip resistance, sleeve friction and pore-water pressure as the cone advances, producing a detailed record of changing ground conditions with a vertical resolution of approximately 1 cm, without the disturbance or interpretive gaps associated with sample-based investigation.

Applications

Foundation design and bearing capacity assessment
Soil behaviour, classification and stress history evaluation
Liquefaction susceptibility screening
Settlement assessment and prediction
Groundwater profiling and pore-pressure dissipation testing

Our CPT Advantage

Integrated pore-water pressure measurement on every sounding

Real-time pore-water pressure measurement on every sounding, not an optional add-on.

Access to constrained sites

Track-mounted and modular rigs capable of testing along slopes, within trenches and other locations where site access is restricted.

Adaptable anchorage systems

Reaction force may be derived from both soil and concrete anchors to allow for testing on basements, runway and road pavements and natural/made ground.

Engineering-led interpretation

Actionable engineering recommendations, not just raw data.

GID's CPT rig set up on a demolition site

Sample GID CPTu deliverable: interpreted soil stratigraphy, soil behaviour type (SBTn) plot, and representative soil parameters table

Deliverables

Factual report section: qc, fs, Rf, and u2 logs with depth

Interpretive section: soil behaviour type classification and derived strength and stiffness parameters

Bearing capacity and settlement recommendations where commissioned

Dissipation testing: pore-pressure dissipation profiles, equilibrium groundwater levels and drainage characteristics

Case Study Spotlight

Saint Lucia · Government · CPT + DPSH

Saint Lucia Halls of Justice

CPT through an obstructed demolition site and an existing reinforced concrete slab where large rounded boulders repeatedly prevented rig anchoring; GID cored through the slab and grout-set threaded rod anchors to achieve reaction force.

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Our Services

Dynamic Probing Super Heavy (DPSH)ISO 22476-2:2005 MASW & Seismic Site ClassificationASCE 7-16 Pile Integrity Testing (PIT)In-house Materials TestingMulti-method Our EquipmentIn-house

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