I was just interested in how other engineers might determine the loads on a wingwall retaining wall shaped as shown below. I believe that the way I did it was fairly conservative, but would like to hear ideas from people just looking at it for the first time. The wingwall is parallel to a railroad track and will have active soil pressure as well as boussinesq surcharge. The embankment outside the wall might not be above the bottom of the wall, so I cannot consider any passive resistance. It cantilevers out from a bolted connection to the side of the bridge abutment.
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