A significant factor in the gorilla's strength is LEVERAGE. The tendon placement in a gorilla differs from that of a human. It is not that the muscle itself is ten times stronger, but that a gorilla can accomplish about ten times the output of a similarly weighted human.
Incidentally, this is a conservative estimate. It is probable that the true strength of a gorilla is considerably beyond ten times a human. There is an account of an enraged gorilla SNAPPING A TIRE by stretching it in a strictly lateral movement, comparable to a rear delt exercise. I would think that such a feat indicates strength that is almost beyond belief.
In the book 'Dangerous to Man' (I think) there is an account of a safari guide in which the claim is made that a gorilla was able to free itself from the grip of an elephant's trunk.
Additionally, even the Guiness Book of Records used to include a proposition that a gorilla could easily raise a ton from the floor. This was based on an observation of a young female gorilla accomplishing a one handed stress pull of over 150 pounds. A powerlifter, by comparison, can accomplish a similar pull (lateral raise) with one hand of nowhere near that weight. And this takes into account the absence of any training or technique from the primate, as well as the fact the actual weight of the gorilla at the time was under two hundred pounds.
So what your looking at is essentially the ability to one hadedly laterally raise your own bodyweight.
Good luck with that.