Abstract
The Velenje coal mine (VCM) is situated on the largest Slovenian coal deposit and in one of the thickest layers of coal known in the world. The thickness of the coal layer causes problems for the efficiency of extraction, since the majority of mining operations is within the coal layer. The selected longwall coal mining method with specific geometry, increasing depth of excavations, changes in stress state and naturally given geomechanical properties of rocks induce seismic events. Induced seismic events can be caused by caving processes, blasting or bursts of coal or the surrounding rock. For 2.5D visualization, data of excavations, ash content and calorific value of coal samples, hanging wall and footwall occurrence, subsidence of the surface and coal burst source locations were collected. Data and interpolation methods available in software package Surfer®12 were statistically analyzed and a Kriging (KRG) interpolation method was chosen. As a result 2.5D visualizations of coal bursts source locations with geomechanical properties of coal samples taken at different depth in the coal seam in the VCM were made with data-visualization packages Surfer®12 and Voxler®3.
Highlights
The Velenje coal mine (VCM) is situated on the largest Slovenian coal deposit and in one of the thickest coal layers known in the world (Figure 1)
Data used in the analysis and for the 2.5D visualization of the VCM was provided by the technical services of the VCM; data of the excavations done in the coal seam, data of ash content and calorific value of lignite samples from surface and cave boreholes, subsided surfaces and bathymetry of formed lakes, data of hanging wall and footwall occurrence, and data of 106 coal bursts locations were provided [13]
The data sets used are digital elevation model (DEM); bathymetry of lakes in 31,159 points; hanging wall and foot wall, which were determined as hanging wall-coal layer and coal layer-footwall occurrence in 901 and 441 boreholes with core sampling; the thickness of the coal layer, which was calculated from the hanging wall and footwall data and was separated into five layers; excavation works till October 2013; locations of 106 seismic events recorded in 2003 and 2004; and ash content and calorific value data of coal layer, containing coal samples from 912 boreholes, made from 1968 to 2002—of these boreholes for coal sampling, of them were drilled on excavations and the remaining 1702 were drilled from the surface
Summary
The Velenje coal mine (VCM) is situated on the largest Slovenian coal deposit and in one of the thickest coal layers known in the world (Figure 1). Data used in the analysis and for the 2.5D visualization of the VCM was provided by the technical services of the VCM; data of the excavations done in the coal seam, data of ash content and calorific value of lignite samples from surface and cave boreholes, subsided surfaces and bathymetry of formed lakes, data of hanging wall and footwall occurrence, and data of 106 coal bursts locations were provided [13] These data sets were combined and used along with digital elevation model (DEM) for a construction of a 2.5D display of individual layers and coal burst locations. Selected data sets were the thickness of the coal seam, the excavations, and ash content and calorific value of coal sampled-data best describing the high geo-stress mining conditions and the mechanical properties of a mined coal layer. For 2.5D visualization of coal burst source locations, mining works and geological layers in the VCM, software data-visualization packages Surfer® 12 and Voxler® 3 were used
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
