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# Pole Foundation Embedment

• To: seaint(--nospam--at)seaint.org
• Subject: Pole Foundation Embedment
• From: RajSTC(--nospam--at)aol.com
• Date: Tue, 9 Nov 1999 14:18:24 EST

```I have difficulty in interpreting pole foundation embedment formula given in
UBC.

Required depth, d, of embedment is a function of S1, which is defined as
"Allowable lateral soil bearing pressure as set forth in Table 29-B, based on
a depth of one-third the depth of embedment."

Is it, therefore, correct to say that, S1=Allowable Lateral Bearing X (Depth
of embedment)/3?  Also, would it not be prudent to discount the frost depth
in this calculation?

One of the footnotes to table 29-B, states that the lateral bearing value
"may be increased the amount of the designated value for each additional
depth to a maximum of 15 times the designated value." So, if d=10 feet in
clayey soil, is the lateral bearing equal to 1000 psf/ft depth of embedment
or should it be an average value of (100+1000)/2 = 550 psf/ft depth of
embedment? Taking advantage of this footnote will make the solution
iterative, because while 'd' is dependent on S1, S1 itself becomes a function
of 'd'.