A quick straight-edge across the general layout diags in the manual suggests that most variants would just 'crunch' the bottom of the cowlings, with, I suspect, minor external damage - perhaps a design feature?
As to evacuation - how long is a piece of string? How hard was the impact? Did you shut down quickly? Are there any signs of fire/smoke/fuel leaks? Did you collapse onto a tug with engine running and full of fuel? I suspect I would have the DV windows open PDQ and make a subjective decision at the time. Popping a front chute would not be a great help in this situation - it would most likely hinder evac from the front doors. An evac would need to be carefully briefed with the c/crew as to which doors to use and how - and you could, of course, finish up with more pax at the front doors than the back doors - due to Sir Isaac.
Work on the assumption that whatever you do is going to be picked over at leisure
- as it probably was! What did the TRE say and was there any official 'guidance' quoted?