DP SPT for weak rock

[italicus]

Anybody can tell me about correlation for weak or fractured rock investigated by DP or SPT
I've found only pressuremeter menard, Plim=spt/20, from Doix & Bustamente for non fractured marl and similar.
Thanks

 

[BigH]

Italicus - I wouldn't even try. Perhaps for "special" type rock (e.g., chalk) there might be some correlations but even for weak fractured shale - the blow counts at 50/1" penetration - what is it going to tell you? You have something more than "soil"???

 

[Focht3]

Agreed. I think it's a waste of time.

What are you trying to accomplish?



Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See faq158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"

 

[duteuch]

hi

I am looking for correlation between pressuremeter parmater (modulus / limit pressure) and SPT or UCS

 

[italicus]

I't will be usefull the abacus of Bustamante and Doix, in their famous article about Micropiles.

A *resumè* can be find here, at page 26, fig. 16 .

http://carreras.frba.utn.edu.ar/civil/cimentaciones/ANCLAJES.pdf