The Standard Penetration Test (SPT) is a widely used in-situ geotechnical investigation method to evaluate soil/rock strength and stratification. When integrated with a rock core drilling rig, it combines rotary drilling for core sampling with dynamic penetration testing, providing comprehensive subsurface data.
Key Features:
1. Procedure:
A split-barrel sampler is driven into the borehole bottom by a 63.5 kg hammer dropped from 760 mm height.
The number of blows required for each 150 mm penetration (total 450 mm) is recorded as the N-value (blow count).
2. Drilling Rig Compatibility:
Adaptable to hydraulic/pneumatic rock core drills (e.g., wireline systems).
Maintains borehole stability during SPT in fractured rock or overburden layers.
3. Applications:
Assess bearing capacity for foundations.
Correlate N-values with shear strength (e.g., for liquefaction analysis).
Complement rock quality designation (RQD) data in core samples.
4. Advantages:
Dual function: Continuous coring + SPT profiling.
Depth capability: Typically, up to 100m, depending on rig capacity.
JCDRILL Core drilling rig provides full hydraulic automatically SPT function, working perfectly in the mining site!
