Cone Penetration Test Process:
The process which is used to find the condition of subsurface from the 100 ft upper of it is known as Cone Penetration Test Process. In other words, we can say that this technique is used to find the Geotechnical engineering properties of soils and its delineating stratigraphy. In the 1950s at the Dutch Laboratory of Soil Mechanics in Delft, this technique was developed to investigate soft soils.Because of this it is also called as "Dutch cone test". It is the most common in soil methods for the soil investigation worldwide.
Modules & Samplers of CPT:
- In-situ resistivity and hydraulic conductivity analyses
- In-situ hydrocarbon screening using an ultraviolet, optical screening tool (UVOST)
- Membrane Interface Probe (MIP) with CPT
- Piezocone Penetrometer
- Seismic analysis (shear wave velocity determination for liquefaction studies)
- Seismic Cone Penetrometer
- Soil Remediation (ORC or HRC Injection)
- SPT Energy Calibration
Testing equipments:
- Cable or transmission device
- Cone Penetrometer
- Data acquisition unit
- Depth recorder
- Electrodes
- Hollow hydraulic pushing rods
Types of Soils in which Cone Penetration Test Works:
- Clays
- Gravelly sand to sand
- Organic soils
- Sand mixtures
- Sands
- Sensitive fine-grained soils
- Silt mixtures
- Very stiff fine-grained soils
- Very stiff sand to clayey sand
Process done by CPT:
- Goodman Jack Testing
- Dilatometer Testing
- Instrument Installation
- Pressuremeter Testing
- SPT Energy Calibration
- Vane Shear Testing
Advantages:
- Economical and productive
- Fast and continuous profiling
- Particularly suitable for soft soils
- Results not operator-dependent
- Strong theoretical basis in interpretation
Disadvantage:
- Electronic drift, noise, and calibration
- High capital investment
- No soil samples are obtained
- Requires skilled operator to run
- Unsuitable for gravel or boulder deposits
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