PROJECTS
Central Alliance has conducted Cone Penetration Testing on a variety of sites across the UK, including work on projects with national significance such as HS2.
CONE PENETRATION TESTING
CPT
About CPT
Central Alliance’s cone penetration testing (CPT) crawler rig is capable of tracking through most terrains. Offering a 200 kN push from a stable platform and able to average over 100 m of data acquisition per day, its 1.7 m jack legs ensure a level push on the most precipitous of terrains. The rig includes a wireless remote control, enabling the operator to safely track the rig from outside with maximum visibility.
Piezocone penetration testing (CPTu) has many advantages over traditional site investigation techniques. CPTu has a very high level of accuracy, taking readings from undisturbed, in-situ soil. With an average resolution of 2 cm and capable of averaging over 100 m of testing per day, it is not a surprise that CPTu is being used by the industry more than ever.
About CPT
Central Alliance’s cone penetration testing (CPT) crawler rig is capable of tracking through most terrains. Offering a 200 kN push from a stable platform and able to average over 100 m of data acquisition per day, its 1.7 m jack legs ensure a level push on the most precipitous of terrains. The rig includes a wireless remote control, enabling the operator to safely track the rig from outside with maximum visibility.
Piezocone penetration testing (CPTu) has many advantages over traditional site investigation techniques. CPTu has a very high level of accuracy, taking readings from undisturbed, in-situ soil. With an average resolution of 2 cm and capable of averaging over 100 m of testing per day, it is not a surprise that CPTu is being used by the industry more than ever.
PROCESSING
Central Alliance processes the CPT data in-house, producing bespoke reports to suit our clients needs. The processed results are provided in AGS and Excel formats.
INSTRUMENTATION
We provide a variety of probes so can tailor site specific testing suitable for a range of sites.
Our current range includes:
• 10cm2 CPT Piezocone (Subtraction type)
• 15cm2 CPT Piezocone (Subtraction type)
• Ball Shaped Tip for 10cm2 Piezocone
• Magnetometer
4 MAIN CPT PARAMETERS
- Cone end resistance (qc)
- Friction (fs)
- Pore pressure (u2)
- Inclination
Included with Standard CPTu Testing
DISPLAYING YOUR CPT DATA
Central Alliance can produce a range of report styles to provide data to suit your project.
Report
Standard Report
Advanced Report
Report
There are many geotechnical parameters that can be derived or estimated from CPTu testing.
Reports are provided to show the results of the ground investigation which can be personalised to outline site specific requirements.
Standard Report
A standard CPTu report contains the following information
- AGS Data
- Soil behaviour type (SBT)
- Soil behaviour type index (Ic SBT)
- Relative density (Dr%)
- Shear strength (Su kPa)
- Standard penetration test (SPT) N60
- Friction angle
Advanced Report
Central Alliance can provide an advanced report which can test for and provide any of the following information
- Permeability (K)
- Constrained modulus (M)
- Young’s modulus (Es)
- Modified soil behaviour type index (IB)
- Modified soil behaviour type (Mod. SBTn)
- Peak/effective friction angle
- Dry unit weight
- Porosity (n)
- Soil sensitivity (St)
- Residual strength ratio
- Bulk Unit Weight
- Water content (w%)
- Void ratio (e)
- Undrained shear strength ratio
- Over consolidation ratio (OCR)
- Shear wave velocity (Vs)
- State parameter (Ψ)
- In-situ soil stress ratio (Ko)
We can also offer bespoke packages to include liquefaction assessments and cross-sectional areas of the site.