CPT SOUNDING

Our offer covers CPT static cone probe sounding. This test requires pushing a cone-shaped probe into the soil using rods. The probe should be pushed in at a constant penetration rate of approx. 2 cm per second. Throughout the duration of the test, the operators constantly monitor cone penetration resistance (qc), and friction sleeve resistance (fs) values.
Electrical CPT cones are precise measuring instruments, specially developed for geotechnical soil investigations. These probes are equipped with strain gauges that enable measuring the resistance force for cone penetration (qc) and sleeve friction (fs). These parameters are measured constantly and simultaneously.
Cone penetration sounding is characterized by high measurement accuracy and sensitivity to variable subsoil properties. In addition to CPT static sounding, we also execute CPTU and seismic tests. We use a seismic module for this purpose.

WHAT DOES CPT INTERPRETATION COVER?

CPT sounding qualitative interpretation covers the determination of:

• subsoil structure homogeneity,
• boundaries between different soil strata,
• boundary between made ground and natural soils,
• preliminary assessment of cohesive soils pre-consolidation.

Whereas the quantitative interpretation covers the determination of:

• soil type (most usually based on the Robertson’s chart),
• index of density (ID) of non-cohesive soils and consistency (IL) of cohesive soils (based on correlations),
• deformation modulae (M0, E0) and shear strength parameters (Ф’, cu)
• load-bearing capacity of foundation piles (direct methods).

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