After national coal,local coal and individual coal exploitation actions one after the other,the water table at Fuxin Bajiazi village fell to 43m under surface, inducing well water broken off.Through numerical simulation analyses on these exploitation actions,using the RFPA~(2D) analysis system,taking underground water breaking off phenomena as an example,this article expounds the relation of rock stress changes with the development of excavating crannies.The result shows that exploitation crannies developme...