On farms a lot of 2 inch (not listed) thin wall PVC pipe is used over otherwise direct burial rated conductors, this is primarily for rodent protection.
Good repair for such thing is 2.5 inch schedule 40, ripped in two on a table saw and then placed around the damaged section and zip tie, tape or whatever to hold in place long enough to bury again.
To restore a real raceway to approved manner, you need to find something listed for the purpose. If conductors are intact and not going to be removed, then that limits you to something that is at least a two piece component. If conductors are to be removed, expansion coupling is one of easiest things to use for final connection if each end is non movable.