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Dynamic Cone Penetrometer, 45º vs 60º and hammer pounds

Dynamic Cone Penetrometer, 45º vs 60º and hammer pounds

Dynamic Cone Penetrometer, 45º vs 60º and hammer pounds

HI Experts,

We have a DCP from Humboldt that has a 45º cone point and 15lb hammer.

All the other references I see is using a 60º cone point with a 17.6 lb hammer.

I am guessing the results will be different. There are a lot of correlation tables for the 60º cone DCP while for the 45º DCP from Humboldt, we only have 1 from ASTM STP 399.

Is there other reference that I can use for the 45º cone point and 15lb hammer?
By the way I need a DCP to UCS estimate correlation. I have a DCP to N value:

But I am not entirely sure if the N-value here can be used for correlation to UCS.

Can anyone help me?


RE: Dynamic Cone Penetrometer, 45º vs 60º and hammer pounds

What are you using the UCS for? foundation design ? Is your hand being forced that you have to use DCP data or is there alternatives available?

I dont really like using DCP, the only time we use it is for small residential housing jobs. With a bit of conservatism it is probably ok. But Short answer for me, i wouldnt use a correlation from DCP to N to UCS. Too many correlations IMO.

RE: Dynamic Cone Penetrometer, 45º vs 60º and hammer pounds

What you have is known as the Sowers Dynamic Cone Penetrometer. It is correlated to SPT. There are numerous references to this.

Here is a link to an article with other correlations ASCE

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