Are you sure re. gender? Digging behavior, if present, could mean eggs on the way for a female. Not sure if 1 y.o. is too young for infertile eggs to develop, but it might be worth 2x checking. In cases of digging females, people here have recommended a lay box.
If this is n/a, something environmental might be causing this behavior, and KR's suggestion about looking at the temps, etc. is good to do. For the wound itself, try raw, unpasteurized honey to treat and maybe some kind of temporary barrier around the lower inside part of the tank to soften the blow if he keeps at it. Cardboard maybe?