Deformation of the surface ground induced by process of inundation of worked out areas after termination of underground mining exploitation

The exploitation of deposits is a limited activity in time and soon or later every mine exploiting the given deposit will come to a phase of liquidation, which is accompanied by termination of pumping out the mine waters. This is shown by a rise of the groundwater table in the region of the deposit negatively affected by exploitation up to the elevation defined by natural or by anthropogenic discharge conditions. The inundation occurs in rock environment, which was negatively affected by previous exploitation accompanied by the origin of empty areas, roof fall zones and rock discontinuities. The inundation of these space formations that were drained off in the course of extraction from technological reasons, changes stress-deformation conditions in rock mass that were in the balanced state until this time. In fact, due to the influence of lifting force in the water on rock mass, the existing stress conditions is relieved, while inducing the deformation changes in rock mass. These changes depending on the size of anthropogenic disturbance of rock mass and the extent of inundation of deposit are shown on the surface in the form of its uplift. After the phase of subsidence during exploitation the upheaval of surface will follow. This upheaval can reach dimensions causing the secondary mining damages on the buildings situated on the surface. This phenomenon was recorded by the survey, e.g. on the surface of the Rosice-Oslavany coal basin where, after inundation, the uplifts were encountered up to +85 mm. Such an upheaval is significant from aspect of the protection of surface buildings.