The studies on the results of periodical stopping of the exploitation front in the seams of mineral coal with the use of surveying methods

Authors: E. Popiołek, J. Ostrowski, P. Sopata, A. Wójcik

Based on surveying in mines "Wesoła" and "Ziemowit" the influence of the breaks in exploitation fronts on vertical translocations and horizontal deformations of the area surface was made.

A very quick manifestation of the results of stopping and restarting the exploitation front within 24 hours for subsidence and 48 hours for horizontal deformations and the high intensity of this impact were found. These results manifest with very big changes in the increases of traslocations and horizontal deformations per day.

They diminish with the stopping of the front till 10-30% of maximum values and then, after its restarting grow to maximum values within 1-2 days. Significantly greater irregularity of the course of the process of the rock mass deformation was observed.

The results of the observations showed that discontinuous mining exploitation could unfavourably effect the buildings and the development of the area increasing the risk of damage.

Presented in the paper results of the survey can be used as source material for the verification of existing views on this issue.