Percent Swell to Field Uplift Pressure
Percent Swell to Field Uplift Pressure
(OP)
Let's say you have a soil sample taken from a 10-foot thick clay layer and the lab results give a 4% swell on the sample. How do you predict the soil uplift pressure in the field if all you are given is the percent swell of the sample?





RE: Percent Swell to Field Uplift Pressure
RE: Percent Swell to Field Uplift Pressure
RE: Percent Swell to Field Uplift Pressure
f-d
¡papá gordo ain't no madre flaca!
RE: Percent Swell to Field Uplift Pressure
RE: Percent Swell to Field Uplift Pressure
Essentially the insurance people was asking a change from generalized mat under attached homes to deeper fotings exerting more pressure. Through the study we were able to prove them that the technically foreseable pressure from swell was about a fourth the actual pressure under the foundation mat anywhere and no change was required to our (in our view) superior foundation, what they accepted.
RE: Percent Swell to Field Uplift Pressure
In relating swell to expansion index, one could say 4% swell is same ase Expansion Index of 40 which is "Low", i.e E.I. value between 20 and 50. If you were to run ASTM 4546, like Irawan suggested, I suspect you would get swelling between 2 and 4 ksf, based on my experience with CA soils.