Static Cone Penetrometer Correlations to N-Values 1

[pelelo]

Hello,

I am working with an engineer who recommended to perform SCP tests in the top 10 feet. I know there is a correlation of dividing the reading (qc) in kg/cm2 by 4 and that is the approximate N-value.

Does anyone know if there is a published reference that provides this information?, i just would like to know any official reference with this information.

Thanks

 

[BigH]

Look at

https://ntnuopen.ntnu.no/ntnu-xmlui/bitstream/handle/11250/2445655/11277_FULLTEXT.pdf?sequence=1

See starting page 68

 

[BigH]

or:

http://www.ejge.com/2014/Ppr2014.608ma.pdf

 

[pelelo]

Thanks,

Probably I was not clear. I was referring to the Manual Cone penetrometer test, also known as, Portable or hand cone penetrometer test.

I am not a fan of it, however one engineer suggested to use it.

Please let me know,

 

[LRJ]

Do you mean a pocket penetrometer (PP) test? Or a fall cone? I don't recognise your terminology.

 

[BigH]

There are many dynamic cone test "standards" - there is the Pentest (Canadian Practice), the TRRL cone test, the Mackintosh Probe, etc. This is why for DCPTs, one needs to specify cone angle, hammer weight, hammer drop, etc. so that others know exactly what cone test to which you are referring.

 

[EireChch]

Your talking about qc, which is tip resistance for a Cone Penetration Test (CPT). Below is a correlation based on Ic (soil behavior type). There are some rules of thumb like qc divided by ,2,3,4,5 etc. But its better to base it on material type.

Dont call it a penetrometer test as makes people think of a Dynamic Cone Penetrometer (DCP), or Mckintosh Proble, or TRL probe or Scala penetrometer, which has many names.