Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations SDETERS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Dynamic Cone Penetrometer (DCP) to N-Values

Status
Not open for further replies.

pelelo

Geotechnical
Aug 10, 2009
357
Engineers,

I have a question about using this DCP to obtain N-Values:

I am using the "Sowers DCP", which is 1-3/8"diam rod with a 45deg cone point and a 15 lb steel ring weight falling 20" on an E-rod slided drive.

According to ASTM STP#399, I am going to record the blows per 1-3/4 inches of increments. In my case, I decided to perform 3 increments per foot, therefore i have 3 DCP blowcount readings per foot. The scope is to perform DCP to a depth of 4 feet below ground, which means i will have 12 blowcount readings, which means that I will get 18 SPT-N values as well (I am using "Curve E").

Definitively, I know that there is something wrong.

My question is, how do i really convert all these data to real SPT-N values?, it seems I am having 3 N values per foot, which doesn't make sense.






 
Status
Not open for further replies.

Part and Inventory Search

Sponsor