An ice sheet can be very heavy, like weighing hundreds of tons or something ..... but here's what has worked for me.
Sit out on the furthest edge of your dock, armed with a long handle ice chopper and a big hammer ...... and, as the ice moves in, just start chopping up the ice, effectively mitigating the ice damage by turning it into chopped ice .... and once the ice sheet reaches your shoreline, the whole big sheet of ice should stop moving forward ....and you will have chopped out a 'zone of no ice' and rescued your dock from getting crushed by the moving ice ...... easy-peasy
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On the down side, you may have to stay out on your dock for a long time.....like for 3-hours.....or something....until the big ice sheet has its forward motion stopped by the shoreline.