Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
(OP)
I am determining the embedment for W6x9 piles to resist lateral loads in the range of 1.25-1.5kips to support a solar structure. We typically do our own soil testing on site, however this project is unique. The geotechnical report provides a "Modulus of Subgrade Reaction (kcf)" in the range of 60-200+ in multiple borings. I am using Allpile 7 for analysis. The lateral analysis input for Allpile is "K" which is the modulus of subgrade in units of (lb/in^3) and "e50".
The input for K is in the range of 0-2000 lb/in3. If the geotech report provides "Modulus of Subgrade Reaction" of say 60kcf --> 60 x 1728 = 103680 k/in3 --> 103,680,000 lb/in3. I'm not a geotech guy, therefore this doesn't make much sense to me.
Ultimately, what shall I input into Allpile for K - modulus of subgrade (lb/in3) when given Modulus of Subgrade Reaction (kcf) from a geotech report of say 60? Thanks so much for your help!
-Nick
The input for K is in the range of 0-2000 lb/in3. If the geotech report provides "Modulus of Subgrade Reaction" of say 60kcf --> 60 x 1728 = 103680 k/in3 --> 103,680,000 lb/in3. I'm not a geotech guy, therefore this doesn't make much sense to me.
Ultimately, what shall I input into Allpile for K - modulus of subgrade (lb/in3) when given Modulus of Subgrade Reaction (kcf) from a geotech report of say 60? Thanks so much for your help!
-Nick





RE: Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
RE: Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
just saying,
RE: Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
RE: Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
Just another expample of someone using software without understanding the input values.
Garbage in = garbage out has never been truer.
Mike Lambert
RE: Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)
But I do agree with the other posters, you should be careful using software to solve a problem you do not completely understand.
Also, not having designed anything like that in a while, and not knowing your soil types, 1500lb applied at the ground surface to a W6x9- I am guestimating 10ft embed? Wait- do you have uplift too?
Steel piles for a solar panel structure? It would seem like shallow auger cast concrete piles may be a better option. Maybe you are extending these up to be the columns also, which would make sense.