I've been writing a spreadsheet for retaining wall design and just realized that in section 188.8.131.52 of the LRFD Bridge Specifications, AASHTO specifies a uniform bearing pressure for spread footings on soil. They do specify the typical trapezoidal pressure diagram for spread footings on rock. This seems to go against everything I was taught and have read about retaining wall design. Is there any particular reason for this?
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