[b]mat foundation
[b]mat foundation
(OP)
I am working on a project that has a 5 million pound load that we can spread over a 30 foot to 60 foot diameter area. We have SPT values on the upper SP/GP soil which rest on moderately hard ROCK that ranges in depth from 12' to 22' below grade. We have some soil samples in the lab that we will perform classification test on and CBR. Any other lab test we should perform to provide information to the project design team for design of a mat foundation?? What will they need from me to design this mat foundation.





RE: [b]mat foundation
RE: [b]mat foundation
RE: [b]mat foundation
RE: [b]mat foundation
upper 12 feet: (200 pci*(12/60)
next layer rock 12 - 22': (determine rock modulus * 10/60)
then lower layer (sand?) to 60':(200 * (8/60))
then add all three together for combined modulus.
The value of 60 is depth. Of course, use modulus numbers that you think are right and depth of influence.
RE: [b]mat foundation
RE: [b]mat foundation
Let A = h1 x cuberoot of E1 + h2 x cuberoot E2.
Let B = h1 + h2
Then E(equivalent) modulus = (A/B)^^3
You will many times find these equations in pavement design books as well where they are looking at determining stresses in a pavement section.