serious structural failure of a yachts keel matrix from a significant grounding.

After any grounding it really is very important to check the internal and external condition of the vessels structure. In this serious failure of the vessels internal matrix that supports the keel if after a grounding you see this sort of damage... do not under any circumstances sail the craft. Seek professional advice and I do hope you have good marine insurance. I travel in many directions around the world to look and advise on this sort of significant hull damage to individuals, boat yards and primarily insurance companies.