Hi everyone. I'm an italian engineering student (sorry for may bad english). I need to clarify a question that i can't solve.
In Schmertmann's formula for estimate the settlement in granular soil by CPT results, some books report only two correction factors: C1 (depth of embedment) and C2 (creep). Other books report further correction factor: C3, but there is disagreement on this. I found indeed two different expression:
a) C3 = 1.03 - 0.03 * L/B > 0.73 (Donald P. Coduto, Foundation Design Principles and Practis, Prentice Hall, 2000 (2nd edition), pag. 235; Jie Han, Principles and practice of ground improvements, Wiley, 2015, pag. 52)
b) C3
So, I'm confused...In his pubblications (1970, 1978), Schmertmann doesn't indicate any shape correction factor called "C3" (or I haven't seen).
Anyone knows something about these two correction factors?
Thanks.
In Schmertmann's formula for estimate the settlement in granular soil by CPT results, some books report only two correction factors: C1 (depth of embedment) and C2 (creep). Other books report further correction factor: C3, but there is disagreement on this. I found indeed two different expression:
a) C3 = 1.03 - 0.03 * L/B > 0.73 (Donald P. Coduto, Foundation Design Principles and Practis, Prentice Hall, 2000 (2nd edition), pag. 235; Jie Han, Principles and practice of ground improvements, Wiley, 2015, pag. 52)
b) C3
= 1.00 [circular footings]
= 1.25 [square footings]
= 1.75 [strip footings]
from Guide to cone penetretion testing, 6th edition, pag. 68. So, I'm confused...In his pubblications (1970, 1978), Schmertmann doesn't indicate any shape correction factor called "C3" (or I haven't seen).
Anyone knows something about these two correction factors?
Thanks.
