I found that a tlb is too slow to get out of the way if it doesn't feel right. I've done them with a sledge hammer just knocking out one row until it starts to creak, stand back annd watch it fall.
would this work on a poured wall silo? Maybe if drilling holes? I will try and get a picture of this tomorrow or sunday. its similar to what bill z posted but taller and only a 10'x10' hole at the bottom and an open top.It's an expansive grout to fracture concrete, rock, or masonary
dexpan would probably work really well for this... put it in half of the circle and watch the whole thing come down. I know from experience that **** really dose a good job... they use it to mine granite in the quarries so im sure that this silo woudnt be to big a challenge