Abstract
One of the most serious hazard in the underground copper mining in Poland is the roof fall hazard. The scale and intensity of this type of events depends on several factors. Due to seismic activity, weaker roof strata can loosen and deform, generating additional load on the rock bolt support. The type of load depends strictly on the course of stratum deformation as well as on the intensity of the dynamic effect in the form of a seismic wave. Continuous monitoring is then necessary to determine the risk level of stability loss within existing excavations in order to minimize the probability of serious accidents. The following study analyses the impact of tremors recorded within the near-wave field upon the stress change in the instrumented rock bolts.
Highlights
Increasing the mined-out area as well as the depth of exploitation and the development of mining works near the fault zones influences the level of seismicity in Polish copper mines
That early assessment of roof fall hazard should be based on a continuous measurement of stress changes in the direct roof of mining excavations
In the mines belonging to KGHM, most of excavations are secured using the rock bolt support
Summary
Increasing the mined-out area as well as the depth of exploitation and the development of mining works near the fault zones influences the level of seismicity in Polish copper mines. As Korzeniowski pointed out [1, 2], the scale of roof deflection, associated with the formation of the destressed zone, can be a measure of the instability risk as well as the occurrence of roof collapses and roof falls. It means, that early assessment of roof fall hazard should be based on a continuous measurement of stress changes in the direct roof of mining excavations. The monitoring of excavation stability in Polish copper mines is carried out mainly in the aspect of interaction assessment of the rock bolt support with. The following paper presents an analysis of the impact of paraseismic tremors recorded in a near field on the stress changes inside the rock bolt rods
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