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Inshore Site Investigation - CPT Operations

Cone Penetration Testing (CPT) is generally carried out in accordance with BS 1377 Part 9 section 3 with the exception that a 5cm² cone is used.

The Cone Penetration Test is based on pushing an instrumented cone into the ground at a constant speed, with continuous measurement of the cone end resistance, the friction along the sleeve of the cone and the pore water pressure.

These measurements make it possible to evaluate accurately the ground conditions and stratigraphy over the penetrated depth. The system is designed to use 2, 5, and 10cm² piezocones.

The probe is pushed into the seabed using a well proven 25kN nominal, 40kN maximum thrust, electric powered ROSON friction wheel drive unit.

Maximum penetration is in the order of 5.0 metres although in specific conditions greater penetration may be feasible. Our preferred method of operation is to utilise 5 cm² cones pushed into the soil with a maximum thrust setting of 20-30kN. Use of 5cm² cones is included in NEN (Dutch) standards.

High strength rigid steel rods reduce the risk of deviation and breakage compared with coiled tubing.

When using a 10cm² cone the base dimension and weight can be increased to 4.0 m² and 5 tonnes respectively.

Read about the real-time data acquisition, the CPT rig and the advantages of using our advanced CPT service.

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