Volumetric changes of rock massif preceding mining seismic events

Grzebyk, W.; Stolecki, Lech

doi:10.1016/j.ijrmms.2015.09.020

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…The elemental content of carbon in the organic (combustible) mass [10,11] is a more informative indicator for establishing the hazardous properties of mine layers compared to the release of volatile substances [12]. The advantage lies in the possibility of its reliable determination in the entire range of metamorphic transformations of coals and 100 % control of the content of the sum of the remaining main components in the organic (combustible) mass О о , Н о , N о , S о (О c , Н c , N c , S c ).…”

Section: Introductionmentioning

confidence: 99%

Analysis of metamorphism and tendency of coal seams and their hazardous properties

Rudniev

Antoshchenko

Filatiev³

et al. 2022

TAPR

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The object of this study is coals of different stages of metamorphism. Currently, a situation has arisen when indicators developed to establish the consumer qualities of coal are used to predict the manifestation of hazardous properties of mine seams during mining operations. The need to consider the fuel for its working condition is due to different end goals between the establishment of consumer qualities of coal and the manifestation of the hazardous properties of mine seams. The condition and quality of coal after its preparation for use is significantly different from the condition in the mining area. Appropriate sample preparation changes the physical and chemical properties of coals, which determine the manifestation of the hazardous properties of mine layers during mining. To eliminate such a discrepancy, the quality indicators of coals were recalculated for their working condition, taking into account the yield of ash and moisture content for the mined mine seams, followed by an analysis of changes in the correlations be-tween the indicators. The indicators of the manifestation of the hazardous proper-ties of mine layers are borrowed from the characteristics of the quality of the fuel, reduced to a dry, ash-free state. Using these indicators, additional errors are introduced in advance into the accuracy of the prediction of the manifestation of hazardous properties during mining operations. The values of the indicators of the organic (combustible) part of the fuel serve as general reliable characteristics of its quality for the entire set of mine seams, but they cannot be used to predict the hazardous properties of a particular mine seam due to a decrease in the accuracy of their determination due to the unpredictable content of mineral impurities and moisture. The initial experimental data, which have been accumulated over several decades based on the experience of using coal for industrial purposes, are analyzed. On the basis of the conducted researches the peculiarities of the choice of indicators of metamorphic transformations of coal, which are used in parallel respectively to establish the quality of fuel and forecast the dangerous properties of coal seams, have been established. The discrepancies between the indicators of the degree of metamorphism used in the current regulatory framework for the safe conduct of mining operations, the state of fuel during mining operations in underground conditions.

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Section: Introductionmentioning

confidence: 99%

Analysis of metamorphism and tendency of coal seams and their hazardous properties

Rudniev

Antoshchenko

Filatiev³

et al. 2022

TAPR

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Numerical and Field Investigations of Rockburst Mechanisms Triggered by Thick-Hard Roof Fracturing

Zhang

et al. 2022

Rock Mech Rock Eng

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Application of MEMS-Based Accelerometers for Near-Field Monitoring of Blasting-Induced Seismicity

et al. 2022

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Proper monitoring of seismic risk and reliable evaluation of destress blasting efficiency requires a well-developed seismic network surrounding the analyzed area. Unfortunately, the construction of a dense seismic monitoring system using standard types of seismometers and accelerometers is associated with high costs of seismic network development and maintenance. Significant improvements in this regard may be potentially achieved by replacing expensive monitoring devices with other cost-effective sensors such as MEMS-based accelerometers. Nevertheless, this topic has not been sufficiently investigated yet, and the usefulness of such devices for monitoring seismicity in deep underground mines has not been recognized. The goal of this paper was to perform preliminary measurements of blasting-induced seismicity in the near-wave field with the use of a single three-axial MEMS-based accelerometer and three uniaxial seismometers. The collected seismic records induced by multi-face blasting were compared in time and frequency domains. In the time domain, the values of 3D peak motion plots were analyzed, and the possibility of identification of subsequent delay times in recorded waveforms was investigated. In the case of frequency distribution, the Power Spectrum Density plots were calculated and compared. The results of the analysis proved that MEMS-based accelerometers provide reliable results and may be successfully implemented for regular use in underground seismic monitoring systems.

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Volumetric changes of rock massif preceding mining seismic events

Cited by 4 publications

References 14 publications

Analysis of metamorphism and tendency of coal seams and their hazardous properties

Analysis of metamorphism and tendency of coal seams and their hazardous properties

Numerical and Field Investigations of Rockburst Mechanisms Triggered by Thick-Hard Roof Fracturing

Application of MEMS-Based Accelerometers for Near-Field Monitoring of Blasting-Induced Seismicity

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