Abstract
The current level of rockburst hazard in copper mines of the (LGOM) Legnica- Glogow Copper Belt Area is mostly the consequence of mining-induced seismicity, whilst the majority of rockbursting events registered to date were caused by high-energy tremors. The analysis of seismic readings in recent years reveals that the highest seismic activity among the copper mines in the LGOM is registered in the mine Rudna. This study investigates the seismic activity in the rock strata in the Rudna mine fields over the years 2006-2015. Of particular interest are the key seismicity parameters: the number of registered seismic events, the total energy emissions, the energy index. It appears that varied seismic activity in the area may be the function of several variables: effective mining thickness, the thickness of burst-prone strata and tectonic intensity. The results support and corroborate the view that principal factors influencing the actual seismic hazard level are regional geological conditions in the copper mines within the Legnica-Glogow Copper Belt Area.
Highlights
Major natural hazards in copper mining in Poland include rock bursts and tectonic movements [1,2]
The analysis of seismic readings registered in recent years in the LGOM area suggests that Rudna is the most tectonically disturbed of the mines in the area [6], which is the result of natural conditions and the need to mine plots in areas already disturbed by extensive mining operations
Questing the reasons for varied seismic hazard level in the Rudna site, reference is made to geological settings in the context of the mining thickness associated with the ore deposit thickness, actual thickness of rock strata in the proximity of the mining operations and tectonic intensity
Summary
Major natural hazards in copper mining in Poland include rock bursts and tectonic movements [1,2]. Most rock bursts and rock mass destressing events registered in the (LGOM) Legnica-Głogów Copper Belt Area have been the consequence of high-energy events whilst the current rock bursting hazard level is associated with mining induced seismicity. Potential of high-energy tremors is an inherent feature of copper fields within the LGOM area mostly due to the occurrence of burst-prone roof rock strata over the worked-out fields and periodic faulting movements, these impacts are further exacerbated due to current mining activities [2,3,4,5]. The analysis of seismic readings registered in recent years in the LGOM area suggests that Rudna is the most tectonically disturbed of the mines in the area [6], which is the result of natural conditions (mining depth, thick-layered rock mass structure, faulting) and the need to mine plots in areas already disturbed by extensive mining operations
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