B777 Flight Attendant reported receiving an injury after a service cart had fallen over due to a damaged galley floor.

Narrative

My entire cart fell over its side; crushing my toe; because the galley floor is bubbled up. It's common knowledge about these floors that need to be maintained/replaced/repaired on the B777 and on multiple wide body planes this is the same issue. Just on this flight today my crew named 4 other flight attendants they knew that this same incident had happened to. In their stories mostly the #2 being injured as they are on the cart by themself back there. I would be curious if you pull injury reports pertaining to 777 and/or 787 galley floors what would be found. As well as maintenance write ups and flight attendant reports. As the #2 I mostly set up the galley; so procedure is Flight Attendant (FA) 3 and 6 and 7 and 8 have carts in each aisle together. The 2 (me) is on a cart alone; going partially up aircraft right aisle from back; back to the galley; then partway up aircraft left aisle; a 'horse shoe' to help. When I pulled back from aircraft right to go up aircraft left aisle; I backed into the galley with the cart and tried to avoid this bulge; but the cart wheel caught it at an angle (not wheel straight back) causing the top heavy beverage cart full of sodas etc; to tip over and crash to the ground. I tried to catch it but it was way too heavy. It came down on my toe. I'm now out waiting for my appointment for an x-ray to see if my toe/foot is broken.If the company would properly maintain their aircraft and not create a hazardous working environment for crew in neglecting to do so. This could also jeopardize passenger safety as they pass through the galley; or heaven forbid if someone tripped in an evacuation. I don't think procedure is wrong; I feel it's safe to be on the cart by yourself if you have a level surface to work on. Just if someone else was on the other side in this instance MAYBE they could have helped catch it; but they're incredibly heavy so very likely not. We shouldn't have to speculate about catching carts working in unsafe conditions. Turbulence happens; but this was completely avoidable.