Analysis of Dynamic Surface Subsidence at the Underground Coal Mining Site in Velenje, Slovenia through Modified Sigmoidal Function

Rošer, Janez; Potočnik, Drago; Vulić, Milivoj

doi:10.3390/min8020074

Cited by 35 publications

(19 citation statements)

References 4 publications

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“…The need for a time function model that accommodates subsidence nonlinearity has been a necessity in surface monitoring improvement within the exploration area of the VCM. The four parametric FNSE model has been successfully applied to optimize monitoring in old mining areas, at locations with less intensive subsidence processes and minor terrain reclamation [33]. FNSE is a product of various modifications of an unexponential algebraic sigmoid function, thus the fitting of the FNSE is much easier compared to similar exponential functions.…”

Section: Overview Of the Fnse Theory (Consolidation Prognosis)mentioning

confidence: 99%

Surface Subsidence Prognosis above an Underground Longwall Excavation and Based on 3D Point Cloud Analysis

Pal

Rošer²,

Vulić

2020

Minerals

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Impacts of underground mining have been reduced by continuous environmental endeavors, scientific, and engineering research activities, whose main object is the behavior and control of the undermined rock mass and the subsequent surface subsidence. In the presented Velenje case of underground sublevel longwall mining where coal is being exploited both horizontal and vertical, backfilling processes and accompanying fracturing in the coal layer, and rock mass are causing uncontrolled subsidence of the surface above. 3D point clouds of the study were acquired in ten epochs and at excavation heights on the front were measured at the same epochs. By establishing a sectors layout in the observational area, smaller point clouds were obtained, to which planes were fitted and centroids of these planes then calculated. Centroid heights were analyzed with the FNSE model to estimate the time of consolidation and modified according to excavation parameters to determine total subsidence after a certain period. Proposed prognosis approaches for estimating consolidation of active subsidence and long term surface environmental protection measures have been proposed and presented. The C2C analysis of distances between acquired 3D point clouds was used for identification of surface subsidence, reclamation areas and sink holes, and for validation of feasibility and effectiveness of the proposed prognosis.

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Section: Overview Of the Fnse Theory (Consolidation Prognosis)mentioning

confidence: 99%

Surface Subsidence Prognosis above an Underground Longwall Excavation and Based on 3D Point Cloud Analysis

Pal

Rošer²,

Vulić

2020

Minerals

Self Cite

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Section: Introductionmentioning

confidence: 99%

“…Sci. 2018, 8, x FOR PEER REVIEW 2 of 11 In most coal fields in China, the mined-out regions are enriched by water, which led to frequent accidents and the serious destruction of ecological environment and serious threat to coal-mining practices [8,15,16]. Therefore the detection of the mined-out areas, especially the water-filled minedout area in advance, is one of the most important issues [17].…”

Section: Introductionmentioning

confidence: 99%

“…The geophysical prospecting is a useful, safe, economical, and rapid way to detect the mined-out areas. Therefore, the mined-out areas detection method is generally given priority to with geophysical prospecting, and drilling technical method validation is complementary [16]. Geophysical method especially Transient Electromagnetic (TEM) technique, as being noninvasive and cost-effective, acquisition of strong signals, deep levels of penetration, easy deployment, and suitability for geological exploration, which remains the first choice to explore the target with conductive characters.…”

Section: Introductionmentioning

confidence: 99%

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Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Liu

et al. 2018

Applied Sciences

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The water-enriched mined-out area, which led to frequent accidents and the serious destruction of ecological environment and serious threat to coal-mining practices. To ensure safe mining practices and to avoid the intrusion of water from the bases of coal deposits, the detection of the mined-out areas, especially the water-filled mined-out area in advanced, is one of the most important issues. This research focuses on detecting mined-out area enriched by water with the large-loop transient electromagnetic method. Data acquisition system was arranged along 23 survey lines, and the total of 1975 survey points were recorded. An inversion technique was used to interpret the TEM data. The inversion results suggested that the mined-out areas enriched by water always exhibit a very low-resistivity, the resistivity contour present closed circle sharp. There are three main water enriched mined-out areas, named JS1, JS2, and JS3 in the north part of the survey area, as well as three main water weak-enriched areas named RJS1, RJS2 and RJS3 in the west and southwest part of the survey area can be inferred by TEM, the interpretation results were verified by drilling. Large loop TEM is proved as an efficient way to investigate water enriched mined-out areas under the rugged topography conditions, and this work provides more detailed geological information to the coal mining enterprise for further coal-mining practices safety arrangement.

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“…The mining subsidence mechanism of a metal mine with fractured blocky rock mass is different from a coal mine with a layered rock mass. The rock mass in a metal mine has a typical inhomogeneous and discontinuous self-stressed block-hierarchical structure because the morphology of ore body, geological structure, and mining methods in metal mines differ from those in coal mines [12,13]. The subsidence of overlaying strata in a metal mine is abrupt, and its subsidence, such as collapse pit and tubular or funnel collapse, is discontinuous.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Movement Laws of the Overlaying Strata and Time Space of the Mined-Out Volume

et al. 2020

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The study and accurate prediction of the movement of overburden rock mass and surface subsidence are crucial for a safe production in metal mines. This study investigates the relationship between the movement laws of overlaying strata and the time space of a mined-out volume using Rock Failure Process Analysis (RFPA) System. Furthermore, the movement, deformation, and failure laws of overlaying strata are examined in different positions when a goaf volume is certain and the failure behavior of the overlaying strata. This study analyzes the similarities and differences of the overlaying strata comparatively. Results show that, regardless of the movement range or subsidence value of the overlying rock mass, a power function relationship is observed between them and working face advancement. Setting the equation shows that the scope of the overlying rock mass is significant when the ratio of a certain position distance roof to the working face distance is small. The results provide a reference for controlling the displacement of the overlying rock mass and treating goaf.

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Analysis of Dynamic Surface Subsidence at the Underground Coal Mining Site in Velenje, Slovenia through Modified Sigmoidal Function

Cited by 35 publications

References 4 publications

Surface Subsidence Prognosis above an Underground Longwall Excavation and Based on 3D Point Cloud Analysis

Surface Subsidence Prognosis above an Underground Longwall Excavation and Based on 3D Point Cloud Analysis

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Relationship between Movement Laws of the Overlaying Strata and Time Space of the Mined-Out Volume

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