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Re: increases to allowable soil pressure

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The Max. allowable soil pressure could be limited by soil strength or settlement. If it is limited because of settlement, then the depth and size of footing have been important factors in affecting the underlaying layers of soil. In such cases as a rule of thumb, you may use the equation B1*q1=B2*q2 (B=width of footing, q=allowable soil pressure for that footing)and don't forget to confirm with your geo-tech guy.
Reza Dashti, P.Eng.

  ----- Original Message -----
  From: Pat Clark
  To: seaint(--nospam--at)
  Sent: Wednesday, December 05, 2001 9:10 AM
  Subject: increases to allowable soil pressure

  To all those geo-tech type guys:

Why is it that 1997 UBC Table 18-I-A allows increases of soil bearing due to width and depth, and every soils report that I have ever seen, never allows these types of increases? The reports only allow the increase due to short term loading / total loading.

  Thanks for the input,

  Pat Clark, P.E.

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