SPT N value~
SPT N value~
(OP)
Hello~
I am first here to post something~
My question is as follows~
Is there any way to convert 50 blows per 30cm into N blows per 30cm ?
For example, 50/15 means 50 blows were needed to penetrate 15cm.
What I want is that in the case of blow count which exceeds 30 blows like above example..how can I convert it to blow count needed to penetrate 30cm...
50/15 ---> ?blows/30cm
50/1 ---> ?blows/30cm
Sometimes it is needed to and wish to convert them to N-blow count per 30 cm....
Pleasre let me know the way to convert(if exists) and reference which concerns about it~
Thank u
I am first here to post something~
My question is as follows~
Is there any way to convert 50 blows per 30cm into N blows per 30cm ?
For example, 50/15 means 50 blows were needed to penetrate 15cm.
What I want is that in the case of blow count which exceeds 30 blows like above example..how can I convert it to blow count needed to penetrate 30cm...
50/15 ---> ?blows/30cm
50/1 ---> ?blows/30cm
Sometimes it is needed to and wish to convert them to N-blow count per 30 cm....
Pleasre let me know the way to convert(if exists) and reference which concerns about it~
Thank u





RE: SPT N value~
For your case, 50 blows for 1cm would represent an extremely dense or hard material and you might be better served to attempt coring that material if you actually needed some material properties.
You have to be careful when you try to extrapolate "N" values beyond actual measurements. For example, a 15cm sample length might not actually represent the conditions that would affect the structure, as it might be a lense of soil with different properties.
RE: SPT N value~
RE: SPT N value~