SPT count procedure
SPT count procedure
(OP)
Normally here is the SPT published procedure:
The sample tube is driven 150 mm into the ground and then the number of blows needed for the tube to penetrate each 150 mm (6 in) up to a depth of 450 mm (18 in) is recorded. The sum of the number of blows required for the second and third 6 in. of penetration is termed the "standard penetration resistance" or the "N-value".
The software I use asks for penetration up to 24 in. In that case what would be the SPT blow count. 2nd+3rd or 3rd+4th or...
Thank you.





RE: SPT count procedure
RE: SPT count procedure
RE: SPT count procedure
In summary, BigH and I do it the same way.
f-d
ípapß gordo ainÆt no madre flaca!
RE: SPT count procedure
It would be most appropriate to use the sum of counts from the 2nd and 3rd 6-in drives (from 150mm to 450mm) for your SPT N-Value. Additional counts should be recorded and reported as they provide additional information which could prove useful in your analysis.
- MorganMWright.com
RE: SPT count procedure