Numerical Simulation of the Impact of Unmined Longwall Panel on the Working Stability of a Longwall Using UDEC 2D—A Case Study

Sylwester Rajwa, Tomasz Janoszek, Janina Świątek, Andrzej Walentek and Dominik Bałaga
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Sylwester Rajwa: Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
Tomasz Janoszek: Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
Janina Świątek: Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
Andrzej Walentek: Department of Extraction Technologies, Rockburst and Risk Assessment, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
Dominik Bałaga: KOMAG Institute of Mining Technology, Division of Machines and Devices, Pszczyńska 37, 44-100 Gliwice, Poland

Energies, 2022, vol. 15, issue 5, 1-19

Abstract: The main goal of the paper is numerical simulation for investigation of damage causes in the working of a longwall located under the unmined longwall panel. The paper presents the results of model-based research on the stability of the roof of a longwall working in a zone subject to cave-in mining, taking into account the influence of mining conditions in the form of an unmined coal seam located 115 m above the exploited seam. It presents the geometry of the rock mass under study, the discretization area of the solution, and gives an overview of the assumptions used to build the numerical model. The authors discuss the results of numerical simulations of the influence of mining phenomena on the formation of roof falls in the longwall. Based on the results of numerical simulations, the process of identifying the size of roof falls in a longwall working (loss of stability) was carried out through their appropriate classification. The case presented and analyzed in this paper occurred in one of Poland’s coal mines.

Keywords: roof fall; numerical modeling; stability; longwall working; unmined longwall panel (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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