Pile Supported Retaining Wall 1

[miecz]

I'm designing my first retaining wall on piles, (actually a bridge abutment) and I'm following some designs that I've collected from various sources (textbooks, old projects). What's curious is, I don't see a check for safety factor against overturning. For a wall on a spread footing, this check drives the design. Is there a safety factor check for overturning at service loads for walls on piles?

 

[miecz]

MichSt-

The safety factors are called for in Section 5.5.5 under Service Load Design Method. Thanks again for all the advice.

 

[Stumpy]

jmiec

I'm a little late to this . . . I am now in the process of designing a pile supported cantilevered retaining wall, and hit this thread on a google search. Wish I had tuned in 6 months ago.

I believe that the factor of safety against overturning, FS=RM/OM, figured by summing moments about the toe pile, should be limited to 1.5 if the heel piles are ignored. If the heel piles are included in the stability check via uplift resistance, a mechanical connection to the base footing is required. The pile uplifting resistance is the unknown to be solved for and the FS can be 1.0, because the safety factor is built in to the skin friction, etcetera.

Stumpy