I'm not sure I understand -- are you saying that the liner itself has a split in it, that the liner has separated from the part that slides into the coping?
As for how coping is attached, ours has 6" of concrete, but before we did the concrete, we attached the with bolts to polymer walls. Our electrical code, which I think is similar to most, required that the coping be grounded, so we also have a copper grounding wire running the perimeter of the pool bolted in with the coping.
Don't know if that helps any. Jo
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