The time of appearance of impact of interrupted mining activities on the surface

Author: S. Knothe

The paper provides the results of research conducted in the coal mines "Wesoła" and "Ziemowit", exploring how the stopping of mining operations at weekends should impact on subsidence and surface deformations.

Daily measuremcnts of ground subsidence taken with the use of geodetic techniques and strain gauge readouts taken every three hours reveal that impacts of stopping and recommencing of mining activities are rapidly manifested on the surface.

The surface response shows after l or 2 days and the impacts persist for 2-4 days.

The intensity ofthe ground response is manifested as a signiflcant reduction in the daily increase of ground deformation and subsidence after the mining operations are stopped, folIowed by a rapid increase of these parameters when mining operations are recommenced.