If the water pressure becomes greater than the rock stress then the rock would be jacked apart, and if it is less the rock will gradually close against the water spaces, raising the water pressure until it is equal to the rock stress.
(the water pressure; becomes; greater than the rock stress) (it; is; equal to the rock stress) (the rock; would be jacked apart; T:then) (it; is; less) (the rock; will gradually close; against the water spaces) (the rock; raising; the water pressure; T:until it is equal to the rock stress)
the water pressure it the rock it the rock the rock
becomes is would be jacked apart is will gradually close raising
greater than the rock stress
equal to the rock stress
T:then
less
against the water spaces
the water pressure T:until it is equal to the rock stress