Tangent pile walls are very similar to secant walls, but a spaced from 1' to about 3' apart and can be used without lagging in competent soils, and with or without tiebacks.They can usually be constructed with ACIP piles or DMM prior to excavation.
Thanks for the repsonses. (Un)fortunately I'm using large segmental blocks (3'high,8'wide,4'deep) and the heaviest geogrid for which interaction testing has been done (synteen SF110), so there's not an easy way to increase grid strength or number of layers, so the deep foundation looks appealing.
Hello, I have designed a MSE wall that is 27 feet max in height. Now the owner wants to include a monument sign behind the wall face about 10' at the max height location. The sign weight is about 375 kips. The lateral pressure from a shallow foundation appears to overstress the goegrids...