Why would it fall through the floor? The LHC creates 100,000 times stronger gravity then the earth in a confined space. Would the black hole not be confined in

Why would it fall through the floor? The LHC creates 100,000 times stronger gravity then the earth in a confined space. Would the black hole not be confined in a small spot that is no larger then a speck of dust with temperatures colder then space. With nothing to feed from and an environment unlike anywhere else, would it ever survive for longer then the short burst...