Relation between benchmark displacement velocity and seismic activity caused by underground longwall exploitation

Abstract

The following paper addresses the problem of mining-induced surface subsidence by giving consideration to the aspect of displacement velocity and its relation to seismic activities recorded in the area of benchmarks. A series of geodetic measurements were carried out in order to develop an accurate description of the deformation process. The mathematical model of a benchmark displacement process was worked out to estimate the maximum deformation velocity and the time of maximum velocity occurrence. The comparison between the measured and calculated data was presented. The displacement velocity value was compared to the seismic activity recorded during the exploitation period. Four cases were thoroughly investigated as they represent types of relation between the seismic activity and the deformation velocity.

Lake bottom relief reconstruction and water volume estimation based on the subsidence rate of the post-mining area (Bytom, Southern Poland)

“…The extraction of natural resources, especially hard coal, is an essential factor leading to the subsidence basins formation, and Bytom is one of the cities most affected by this process 12 – 16 , 44 , 51 , 64 , 81 , 82 . Subsidence is accompanied by mine-induced seismicity, typical of the USCB area 23 , 83 – 86 and the formation of fault zones. It leads to an abrupt, temporary increase in the subsidence rate, exceeding the average speed by 20–30 times.…”

Some Remarks on Impact of Mining Based on an Example of Building Deformation and Damage Caused by Mining in Conditions of Upper Silesian Coal Basin

“…Another possible kind of impact involves rock mass tremors. Several Authors have noticed a relation between the course of mining subsidence (Piwowarski et al 2017) or subsidence rate (Duda 2016) and seismic activity of the rock mass. All these forms of impact of mining exploitation on the surface pose a clear danger to buildings.…”