##  [Standard Penetration Test](/standard-penetration-test) 

  ##  [Standard Penetration Test](https://engineering.quantumdictionary.io/standard-penetration-test-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

An in‑situ geotechnical test in which a standard split‑barrel sampler is driven into soil by a falling weight and the number of hammer blows required to advance the sampler a defined distance (commonly the blows for the final 300 mm) is recorded as the N‑value; the N‑value is an empirical measure of near‑surface soil resistance used for relative density, settlement and bearing‑capacity correlation