Acta Geodynamica et Geomaterialia

Title: DETERMINATION OF THE VALUE OF THE ELASTIC MODULUS OF THE ROCK MASS ESRM DISTURBED BY A LONGWALL OPERATION
Author: Drzewiecki Jan
DOI: 10.13168/AGG.2015.0030
Journal: Acta Geodynamica et Geomaterialia, Vol. 12, No. 4 (180), Prague 2015
Full Text: PDF file (1.9 MB)
Keywords: coal exploitation, energy seismic events, seismicity prediction, in situ measurement, elastic modulus of rock massif
Abstract: This paper presents a method of determining the value of the elastic modulus of large-size piece of rock in the Bobrek mine. The basis of the analyses were relations between the mechanical and geometrical parameters of the rock mass in the environment coal seam 503, the intensity of its exploitation and its associated seismicity. The correct estimation of physico-mechanical and geometrical parameters of the rock mass is crucial for safety. As a result of changes in rock mass, due to the exploitation, some rock mass parameters change their value. The result of the analysis is a method of calculating the value of the elastic modulus Es for large fragments of rock disturbance by panel 1 operation. The results of the analyses are presented in graphical form. The results of the analysis indicate that for the correct seismicity forecasts, induced by coal seam operation, it is necessary to calculate the elastic modulus layers for the in situ conditions, i.e. for areas in which there are registered strong seismic phenomena. The developed formulas can be used both for ad-hoc analysis and long-term forecasts of seismic events energy.