Can raise x3 and fold jam?

yes.^

but what is your plan if the villain calls your 3bet and all you are holding is 8high on the turn?.

Give up

it's ok to shutdown. np

but the turn could possibly give you a chance to barrel if villain checks , (eg. villain turned missed flush draw, straight draw, weak J or scared gutshot etc..

if you proceeded to bet the turn and get called, then shut down river(crossed fingers you river a pair and it goes check--check) or fire that third barrel if villain checks as there is a wide range of hands you can get to fold(eg, missed flush draws, straight draws, gutters, A high, J's, PP's etc..

there are many other lines to take

I'd just raise and give up on pretty much any turn, maybe barrel A and Q, I'm not sure about those. feel, you're really optimistic on getting villain to fold there imo