Standard Penetration Test Procedures and Effects in Sands of Overburden, r

[gianniorlati]

Standard Penetration Test Proceures and the Effect on Sands of Overburden Pressure, relative Density, Ageing and Overconsolidation

• Author(s): A. W. Skempton
  
• Published By: Geotechnique
  
• Published Year: 1986
  
• Size: 1.70 MB
  
• Quality: Scanner(OCR)
  
• Abstract: Granted that good site control is exercised in carrying out the standard penetration test the energy delivered
  to the sampler, and therefore the blow count obtained in any given sand deposit at a particular effective overburden pressure, can still vary to a significant extent depending on the method of releasing the hammer, on the type of anvil and on the length of rods (if less than 10 m).
  For consistency it is essential to correct the observed blow count N to the value which would have been measured using a specified rod energy.
  A recommended value, which should be recognized internationally, is 60% of the free-fall energy of the standard hammer weight and drop.
  The corrected blow count is then designated as N 60 and the normalized value (N 1)60 at unit effective pressure ( 1 kg/cm 2 or 100 kPa) may be regarded as a basic characteristic of the sand.
  

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