80 foot long retaining wall that ranges from 4 feet tall on one end to 12 feet tall on the other.
I am planning on a segmental wall made of Versa-Lok "Bronco 18" blocks - 1200+ pounds each. Yes proper drainage and geo-grid behind the wall, etc.
Theoretically (I think) if the bearing value of the soil is high enough, I can just clear away the topsoil, prepare a nice bearing surface of compacted road base, and stack up the blocks like legos. HOWEVER, I would like to go further than this ...
Can I create an 80 foot long grade beam, right at the surface of the existing soil, with perhaps a 8 foot deep pier every 6 feet (helical rebar, etc.) connected to a steel reinforced grade beam (all one concrete pour) and then stack my blocks on that, with the lip hanging off the back of it, of course ? So basically I am doing a big giant 80 foot long first block that goes into the soil with piers, and then stacking the rest of the blocks on it ?
It seems to me that this would guarantee stability of the wall, regardless of the bearing value of the soil.
Is this something that people do ? Lay down a grade beam with piers to stack the segmental wall on top of ?
Is this the unbelievably overbuilt, guaranteed to never move solution that I think it is ?