Dependence between the height of rocks displacement zone with fissure and the size of stopes

Purpose. To establish dependences describing changes in the height of rocks displacement zone with fissure in the course of stope development using experimental data about the stopes' dimensions and parameters of the land surface displacement troughs. Methods. On the basis of statistical processing of experimental data to establish dependence of the upper boundary of rocks displacement zone with fissure on values of the maximum land surface subsidence and the stopes' dimensions. Findings. The conducted research allowed to determine that the maximum height to which the underworked rocks zone with fissure spreads is reached when the stoping face is located at the distance equal to lava length. Originality. Dependences for calculating the upper boundary of rocks displacement zone with fissure were derived from the values of the underworked rocks displacement angles determined by the maximum land surface subsidence and the stopes' dimensions. Practical implications. Departing from the relevant theoretical provisions, experimental data and the conducted research, we obtained an empirical dependence for calculating the height to which the underworked rocks zone with fissure spreads.