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

Janez Rošer,Milivoj Vulić,Drago Potočnik

doi:10.3390/min8020074

Abstract

In underground coal mining engineering, one of the most important tasks is to monitor, predict and manage the surface subsidence due to underground coal excavation. The impact of underground mining excavation reflects as subsidence of the overlying strata and the formation of surface depressions soon after excavation. The surface subsidence is one of many natural processes that exhibit a progression from small beginnings that accelerate and approach a climax over time. When detailed data is lacking, a logistic function is often used. In this paper, the analysis of the surface subsidence above underground mining sites in the Velenje Coal Mine by using a modified sigmoid function (surrogate of logistic function), with the common “S” shape, is introduced. Furthermore, the time estimation of the next and the final epoch measurement is considered.

Highlights

The Velenje Coal Mine (VCM) is one of the largest and most modern deep coal mining sites in Coal ofMine is one of the largest most mining in Europe.TheThe thickness the(VCM)coal deposit ranges fromand 20 to160modern m
The mining mining method used is known as Velenje Mining Method (VMM) and is unique in world mining method used is known as Velenje Mining Method (VMM) and is unique in world mining technology technology [2]
In the VCM, several excavation panels are active in different levels at the same time

Summary

Introduction

The Velenje Coal Mine (VCM) is one of the largest and most modern deep coal mining sites in Coal ofMine is one of the largest most mining in Europe.TheThe thickness the(VCM)coal deposit ranges fromand 20 to160modern m. The Velenje Coal Mine (VCM) is one of the largest and most modern deep coal mining sites in Coal of. Mine is one of the largest most mining in Europe.The. coal deposit ranges fromand 20 to. Thedeep coalcoal layer is 100sites m thick thickness of the the coal deposit rangesoffrom to 160 m. The VMM is characterized by continuous caving-in of the hanging wall layers, where [2]. The VMM is characterized by continuous caving-in of the hanging wall layers, where the length the length of longwalls amounts from 80 to 210 m and the length of panels vary from 600 to 800 m of longwalls amounts from 80 to 210 m and the length of panels vary from 600 to 800 m (Figure 1)

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Conclusion