Geomechanical analysis of location and conditions for mining-induced tremors in LGOM copper mines

Cieślik, Jerzy; Burtan, Zbigniew; Chlebowski, Dariusz; Zorychta, A.

doi:10.1016/j.jsm.2017.10.002

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…These analyses were performed for all seismic energy intervals. As observed [5], ca. 75% of seismic events during mining operation are located in front of the mining face.…”

Section: An Analysis Of Seismic Events Locations Relative To the Minisupporting

confidence: 76%

“…However, due to the complexity of this problem, it might prove impossible to find a solution based on analytical and numerical calculations. An attempt to determine such distances was made in the course of analysing data from the selected colliery's mining geophysics station on seismic activity observed during the mining of four longwalls of coal bed 502/1 in part K. The study was based on the authors' previous experience regarding the locations of seismic foci during mining operations [5], where the vast majority of seismic events occurred in front of the mining face. Such regularities were also confirmed in other studies [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Seismicity induced by hard coal mining in the vicinity of faults

2018

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An inherent feature of Polish collieries within the Upper Silesia Coal Basin is the high level of mining induced seismicity, resulting in elevated rockburst hazard levels. One of the major causes of high-energy seismic events is that mining operations are continued in the vicinity of major faulting zones. The study summarises the results of geo-mechanical and statistical analysis of mining-induced seismic activity in the region of major faults, in a selected section within a colliery. Seismic activity assessment involves the categorisation of seismic events due to tectonic movements in the context of various face development systems with respect to the faulting zone: perpendicular (advancing towards the faulting zone or retreating) or parallel (along the faulting zone). Registered seismic activity was analysed in the context of epicenter locations and variations of seismic activity in relation to the developing face operations in the function of time and energy ratings (Gutenberg-Richter formulas). Results have demonstrated that increased levels of seismic activity in the strata can be attributable to mining operations in the vicinity of major faulting zones.

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“…These analyses were performed for all seismic energy intervals. As observed [5], ca. 75% of seismic events during mining operation are located in front of the mining face.…”

Section: An Analysis Of Seismic Events Locations Relative To the Minisupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Seismicity induced by hard coal mining in the vicinity of faults

2018

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“…Since the 1980s, copper ore extraction has been carried out in the study area using the pillar-and-chamber method with bending of the roof layer, partially with surface protection [64,65]. As a result, maximum values of land subsidence recorded in the study area reached a few meters.…”

Section: Study Area and Input Datamentioning

confidence: 99%

Estimation of Mining-Induced Horizontal Strain Tensor of Land Surface Applying InSAR

et al. 2021

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Horizontal strains related to mining-induced subsidence may endanger infrastructure and surface users’ safety. While directional horizontal strains should be well determined, appropriate solutions for a complete assessment of the terrain surface deformation field are still required. As a result, the presented study examined a new method for calculating horizontal strain tensor based on the decomposition of satellite radar interferometry (InSAR) observations into vertical and azimuth look direction (ALD) displacements. Based on a geometric integral model, we tested our method on experimental data before applying it to an underground copper ore mine in Poland. In the case study, the displacement field was determined using the Multi-Temporal InSAR method on Sentinel-1 data. The model data relative error did not exceed 0.02 at σ = ±0.003. For the case study, land subsidence of up to −167 mm and ALD displacements ranging from −110 mm to +62 mm was obtained, whereas the extreme values of horizontal strains ranged from −0.52 mm/m to +0.36 mm/m at σ = ±0.050 mm/m. Our results demonstrate the high accuracy of the method in determining the horizontal strain tensor. As a result, the approach can broaden the assessment of the environmental impact of land subsidence worldwide.

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“…The potential for high-energy tremors is an inherent feature of copper fields within the LGCD region, mostly due to the occurrence of burst-prone roof rock strata over the worked-out areas and periodic faulting movements; these impacts are further exacerbated due to current mining activities [1]. The analysis of seismic activity recorded in recent years in the LGCD mine region shows that the most seismically active is the Rudna mine (Figure 1) [1,2]. One of the effective active methods of preventing the threat of tremors and rockbursts is torpedo blasting performed in thick and highly stiff layers of the rock mass, which are the so-called tremor-prone layers.…”

Section: Introductionmentioning

confidence: 99%

Geomechanical and Technical Aspects of Torpedo Blasting under Seismic and Rockburst Hazard Conditions in Legnica–Glogow Copper District Mines

Burtan,

Cieślik,

Chlebowski

et al. 2024

Energies

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The dominant hazard in the Polish copper ore mining industry (LGCD mines—Legnica–Glogow Copper District) is the occurrence of mining tremors and rockbursts. One of the effective active methods of preventing this threat is torpedo blasting, which results in disturbing the structure of roof rocks. A change in the integrity of a roof, especially in the tremor-generating layer or in the contact between stiff rock layers, reduces the possibility of an elastic energy concentration and may also be a kind of stress concentrator, provoking the destruction of rocks. This article presents original solutions for determining the areas of rock mass within a mining area where it is advisable to conduct torpedo blasting, and the experience of blasting in the Rudna copper mine in the LGCD is described. The first part of this article presents the results and experiences of using torpedo blasting prevention in the LGCD mine conditions in the Rudna mine. Assuming that due to the stress of the rocks, torpedo blasting brings the greatest benefits in the areas of elastic energy concentration, the second part of this article presents the results of numerical modeling, on the basis of which the zones of elastic energy concentration in the form of total, shear and volume deformation were determined in the vicinity of mining activities for typical geological and mining conditions in the LGCD. The importance of methods for the verification of the proposed solutions based on the analysis of seismic activity and geophysical mechanisms of events’ foci and seismo-acoustic emissions was also emphasized. The numerical simulations performed and conclusions from in situ observations allowed the formulation of general principles for the selection of torpedo blasting parameters.

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Geomechanical analysis of location and conditions for mining-induced tremors in LGOM copper mines

Cited by 12 publications

References 6 publications

Seismicity induced by hard coal mining in the vicinity of faults

Seismicity induced by hard coal mining in the vicinity of faults

Estimation of Mining-Induced Horizontal Strain Tensor of Land Surface Applying InSAR

Geomechanical and Technical Aspects of Torpedo Blasting under Seismic and Rockburst Hazard Conditions in Legnica–Glogow Copper District Mines

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