PECULIARITIES OF TEMPORAL DEVELOPMENT OF UNDERWORKED ROCK MASS MARGINAL STATE ZONES
We investigated the behavior of a rock mass undermined by a longwall face. Fast Lagrangian procedure was used to simulate the process of ground subsidence and destruction. Zones involved in the destruction process were identified and 3D-plotted. Computer simulation demonstrated that the process of surface destruction begins before the moment when the undermined rock mass has completely passed into inelastic state.