Cone Penetrometer Testing employs a technique that pushes, instead of drills, an instrumented probe into the soil to obtain soil properties.
Major components of a CPT system
Data acquisition system
The CPT Probe Measures
Sleeve friction stress
Pore water pressure
General CPT Advantages
For most applications, CPT is faster and more cost effective than conventional drilling and sampling.
CPT sensors allow detection in situ, which eliminates errors due to poor or improper sampling techniques.
A complete, real time profile is created from ground surface to depth of penetration, thereby identifying important layers that may be missed in an interval sampling approach.
CPT is a minimally invasive approach to site characterization that minimizes potential cross contamination in environmentally sensitive areas.
Drilling waste is virtually eliminated. This brings significant savings in the cost of hazardous waste disposal.
There is a significant reduction of exposure to potentially hazardous material, which means increased worker safety.
Engineering Analysis Parameters
The engineering analysis parameters that can be determined using a typical CPT probe include:
Soil behavior type
Relative density (Dr)
Overconsolidation ratio (O.C.R.)
Blow count (n)
Friction angle (o)
Undrained shear strength (Su)
Groundwater table location (with dissipation tests)
Compressibility (c) (with dissipation tests)
Permeability (k) (with dissipation tests)
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