"would snow going through a big fan engine cause structual failure"
A few years ago, a central europe airport had the brilliant idea to clean the runway of snow by pushing it on the side of it. Our first b747 coming in the early morning hours put full reverse after touch-down (braking action reported on the low side).
Jet blast from reverse lift the snow and engines ingested it. Engines 1 and 4 severely damaged nearly beyond repairs. Ops not to happy about it....