If the tyre is low profile with big rim, in the same time the suspension is stiff and the hole is deep, then it is posible to damage the rim -_-
Compare aluminium rim with iron rim, aluminium is more light weight and stiff then the iron but not flexible as iron. So when facing deep impact, aluminium is more easy to brake then the iron.
To soft this problem, you can try to change bigger tyre, exp: now the size of tyre is 165/50 R13, you can change to 165/60 R13 even down grade to 155/70 R12. Just for example~! Hope this can help you.