Monitoring Velocity Changes Caused By Underground Coal Mining Using Seismic Noise

Czarny, Rafał; Marcak, Henryk; Nakata, Nori; Pilecki, Z.; Isakow, Z.

doi:10.1007/s00024-015-1234-3

Cited by 19 publications

(12 citation statements)

References 25 publications

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“…This parameter determines the rate of growth of the cracked area [10] and if it is near the critical value then its increase may be noticeable in the measurement data, both seismological and seismic [5]. Ouchi in [11], shows that an increase in seismic events dn (t) depends on the size of the population n(t) and the coefficients of growth and also depends on a h(t) representing local conditions: …”

Section: Geomechanical Aspects Of the Hydrofracturing Processmentioning

confidence: 99%

Change in the physical parameters of rocks due to hydrofracturing

Marcak

2017

E3S Web of Conferences

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Abstract. Hydrofracturing is a procedure performed for the activation and intensification of fluid flow in shale and geothermal deposits. This operation involves the risk of inducing strong seismic shocks and the leakage of borehole liquids into drinking water reservoirs. The changes of the physical properties of the rocks deformed by hydro-fracturing are modelled numerically. The structure of the model is presented in the paper. It is also demonstrated that the development of fracture zones resulting from the hydro-fracturing process can be investigated by electromagnetic and seismic methods. The flow of liquids through linear elements (fractures and cracks) increases the risk of destructive action through a combination of tectonic and hydro-fracture stresses.

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Section: Geomechanical Aspects Of the Hydrofracturing Processmentioning

confidence: 99%

Change in the physical parameters of rocks due to hydrofracturing

Marcak

2017

E3S Web of Conferences

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“…Equally dangerous is the situation in which there is an increase in rock damage, which is manifested by a velocity decrease, often to values smaller than those recorded before. On this basis, attempts have been made to use seismic tomography to predict changes in the rock mass, especially to identify seismic risks or rock bursts and to locate the seismic events more accurately (Dubinski and Mutke 2005;Mutke 2007;Banka 2009). In the case of an underground mine, where data are obtained from seismological networks, there are much less unknown parameters.…”

Section: Introductionmentioning

confidence: 99%

Seismic activity reduction with the use of blasting and passive seismic tomography control, a case study from copper ore mine, Poland

Gogolewska

Smolak

2021

Acta Geophys.

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Deep copper ore mines in Poland have been struggling with seismic hazard since almost fifty years ago when the first rock burst occurred. Increasing exploitation depth and mined-out space make the mining conditions constrained and severe causing the seismic activity to grow substantially. Consequently, rock burst preventive activities have to be incorporated into mining technology to provide work safety. To date, the group winning blasting has posed the most commonly used preventive measure, so its efficiency in seismic energy reduction is of significant importance for the rock burst hazard mitigation. The more energy blasting works provoke to release the safer the work environment gets. The article aimed to assess the efficiency of such an energy reduction, which was approached in two ways. Firstly, the drop of energy and in turn its reduction efficiency was assessed simply using a percentage of provoked tremors’ energy and number. Next, the analysis employed passive seismic tomography results to find if provoked tremors took place in high-velocity zones. The analysis made it possible to verify the assumption that the more provoked energy occurs in such zones the more successful preventive blasting is.

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“…Mining operation in the conditions of rockburst hazard require effective prevention measures, including long-term and short-term control strategies developed in the mining practice [1]. Broadly-understood rockburst control and forecasting of the rockburst threat levels rely mostly on geophysical methods: seismic and seismoacoustic observations, seismic measurements involving seismic profiling in coal seams and seismic tomography [2][3][4][5][6][7][8][9]. In recent years analytical and numerical methods were also developed and effectively used to determine the range and extent of stress concentration zones, de-stressed regions in the proximity of longwall/shortwall faces and near the development entries [10][11].…”

Section: Introductionmentioning

confidence: 99%

Rockburst hazard assessment based on seismic tomography and analytical modelling - a case study

Chlebowski

Burtan

2018

E3S Web Conf.

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In accordance with the formal regulations currently in force in Poland, the criteria for rockburst hazard assessment with respect to coal deposits include the records of seismic events and their impacts, de-stressing of the entire seam or its parts and expert opinions of mine operation engineers. Effectiveness of the de-stressing can be verified by geophysical test data whilst the expert opinions are mostly based on mathematical modelling using specialist software or dedicated simulation algorithms. This study collates and synthesises the results of tests carried out in a seam section in a colliery within the Upper Silesia Coal Basin, obtained by the outlined methods. Geophysical survey results are interpreted basing on seismic tomography procedures utilising the geo-tomography techniques for velocity field reconstruction in data processing. For comparison, the stress state modelling data are provided, based on conventional engineering solutions applicable to mechanics of deformable media. The actual assessment of the rockburst threat level is based on observations of distributions of the longitudinal wave velocity in relation to the actual value of the vertical component of stress concentration within the coal seam.

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Monitoring Velocity Changes Caused By Underground Coal Mining Using Seismic Noise

Cited by 19 publications

References 25 publications

Change in the physical parameters of rocks due to hydrofracturing

Change in the physical parameters of rocks due to hydrofracturing

Seismic activity reduction with the use of blasting and passive seismic tomography control, a case study from copper ore mine, Poland

Rockburst hazard assessment based on seismic tomography and analytical modelling - a case study

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