Vliv mnohonásobného podzemního dobývání na trvání procesu deformace zemského povrchu

The empirical formula, that enables calculation of land surface deformation process duration in conditions of weak rock mass, loosened by earlier multiple extractions. This dependence may be usable in situations, where one cannot determine the moment of surface movement decay on the basis of the geodetic measurements or in forecasting of land surface movement duration caused by planned extraction