I've tried everything I can think of but as far as I can tell there's no way to disable a punji trap.
Typical disabling options don't work, explosives, using guns, melee etc. The only method that seems to work is triggering it by running into it. Or over it with a tank, jeeps don't work as they still damage you.
Normally I don't have a problem with it as it's simple to avoid it. However this is especially disturbing in tunnel systems where there isn't particularly way through without someone jumping on the metaphorical grenade.
Just was hoping to have some attention brought to this. Other than that, I've no disappointments in any way with this DLC and would recommend it to anyone!