The influence of regional geological settings on the seismic hazard level in copper mines in the Legnica-Głogów Copper Belt Area (Poland)

Burtan, Zbigniew

doi:10.1051/e3sconf/20172401004

Cited by 10 publications

(10 citation statements)

References 2 publications

(2 reference statements)

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“…A deep series of Tertiary sediments represent the Rotliegend and Zechstein strata. Sediments from the Neogene and Paleogene periods formed the youngest rock strata [61]. There are numerous fault zones in the study area (Figure 1B).…”

Section: Study Area and Input Datamentioning

confidence: 97%

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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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Section: Study Area and Input Datamentioning

confidence: 97%

“…These zones run northwestern to the southeast. The main faults range in inclination from 30 • to 90 • [61][62][63].…”

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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“…The mining-induced seismicity and related rock burst hazard may be the function of several parameters: in LGCD, the principal factors influencing the seismic hazard level (measured by the number of registered seismic events and the total seismic energy released) are the regional geological setting, i.e., the effective mining thickness and the thickness of burst-prone roof rock strata, and the possible variation of tectonic stress intensity [36]. Limestones and anhydrites that lie above the ore store elastic strain energy that can be released through fracturing and rock bursts [19].…”

Section: Discussionmentioning

confidence: 99%

“…The roof of the LGCD mines consists of sub-horizontal limestone or dolomite strata 200 m thick, while anhydrite and gypsum layers, parallel to the bedding, lie above (Figure 2b). The ore is located above the basement rocks at the intersection with two NW-SE and NNE-SSW striking fault systems that control the regional distribution of the metal and the content of mineralization and its geometry [34]; the ore is tectonically disturbed by a dense grid of fractures and faults [35,36]. The dominant fault system in the mining area coincides with the fault zone of Rudna and Lubin (Figure 2a).…”

Section: Geological Settingmentioning

confidence: 99%

Tracking Deformation Processes at the Legnica Glogow Copper District (Poland) by Satellite InSAR—I: Room and Pillar Mine District

Antonielli

Sciortino

Scancella³

et al. 2021

Land

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Mining exploitation leads to slow or rapid ground subsidence resulting from deformation until the collapse of underground post-mining voids following excavation activities. Satellite SAR interferometry capabilities for the evaluation of ground movements allows the monitoring of intensive surface mine subsidence and can provide new knowledge about the risks in the mining industry. This work integrates both conventional and advanced Differential SAR Interferometry (DInSAR) to study the ground subsidence in the Legnica Glogow Copper District (LGCD, Poland) by processing about 400 Sentinel-1 images from October 2014 to April 2019. Even without field data and information on past and ongoing excavation activities, the DInSAR approach allowed us to identify 30 troughs of subsidence, ranging from 500 m to 2.5 km in diameter, which in some cases, took place several times during the analyzed time span. The cumulative subsidence in 4 years and 7 months exceeds 70 cm in several zones of the LGCD. The sub-centimetric precision achieved by advanced analysis (A-DInSAR), allowed us to monitor the real extent of the mining influence area on the surface, with deformation velocities of up to 50 mm/year. The ground deformation detected at LGCD can be due to both mining-induced tremors and roof subsidence above the underground excavation rooms. As deformations do not occur concurrently with tremors, this can be related to excavation activities or to degradation of abandoned mines.

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“…In the course of removal of rock the pillars degrade enabling gradual roof subsidence [1]. With the increasing depth of exploitation it was observed that increasing stress create more and more difficulties during the mining process [2]. Currently, the most significant hazard is associated with seismic activity resulting from disturbance of equilibrium state of primary stresses in the rock mass.…”

Section: Introductionmentioning

confidence: 99%

Seismic Peak Partcile Velocity and Acceleration Response to Mining Faces Firing in a Light of Numerical Modeling and Underground Measurements

Pytel¹,

Mertuszka²,

Lurka³

et al. 2018

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings

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Extraction of the copper ore deposit in the Legnica-Głogów Copper Basin in Poland is usually associated with high seismic activity. In order to face this threats, a number of organizational and technical prevention methods are utilized, from which blasting works seem to be the most effective. A significant number of recorded dynamic events may be clearly and directly explained by the effects of this approach. It is also expected, that the simultaneous firing of a number of mining faces may provide the amplification of vibrations in a specific location chosen within the rock mass. For better recognition of a such process, formation of an elastic wave generated by the detonation of explosives in a single mining face have been evaluated using the numerical tools and verified by the field measurements of ground particle velocity and acceleration parameters, i.e. PPV and PPA parameters. The primary objective of presented paper was to find the bridge between numerical simulations of the time-dependent seismic particle velocity values induced by blasting and in situ measurements using seismic three component geophones.

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The influence of regional geological settings on the seismic hazard level in copper mines in the Legnica-Głogów Copper Belt Area (Poland)

Cited by 10 publications

References 2 publications

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

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

Tracking Deformation Processes at the Legnica Glogow Copper District (Poland) by Satellite InSAR—I: Room and Pillar Mine District

Seismic Peak Partcile Velocity and Acceleration Response to Mining Faces Firing in a Light of Numerical Modeling and Underground Measurements

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