Journal of Mining Engineering

Journal of Mining Engineering

Numerical Analysis of the Mechanized Mining Face Stability in Parvadeh No.1 Coal Mine, Tabas

Document Type : research - paper

Authors
1 Faculty of Mining, Petroleum & Geophysics Eng., Shahrood University of Technology, Shahrood, Iran
2 shahrood university of technology
3 Shahrood university of technology
Abstract
Ensuring the stability of the working face in longwall coal extraction is a crucial factor in the economic viability of this method. Numerous parameters influence working face stability, necessitating a comprehensive understanding of their impact on safe and economical mining. This study investigates the stability of a mining face in the actual extraction area, focusing on the E3 Panel of the Tabas Parvade coal mine. A numerical model is employed to examine the effects of mining and layer displacement on working face stability.
Initially, the influential parameters for working face stability are categorized and analyzed. Subsequently, using FLAC3D software, the stability of the E3 Panel working face in the Tabas Parvade coal mine is simulated and evaluated. Sakurai criteria are applied to assess wall and working face stability by calculating shear strain values in these areas.
The simulation explores the impact of initial and periodic wall weighting effects on the stability of the extraction face during coal extraction. Initial and periodic collapses are predicted to occur at approximately 11.5 and 2.5 meters, respectively, with the initial roof collapse following the extraction of the fourth coal seam. Results from numerical modeling indicate a likelihood of instability within 6 to 10 meters after progressing in the working face, coinciding with initial and periodic roof collapses.
In summary, the working face in the E3 Panel of the Tabas Parvade coal mine is described as transitioning between slippage and stability, with the upper roof prone to sloughing after extracting six coal seams. Pressure on the mine openings is notably higher on the Tailgate side, and there's a risk of the working face collapsing near the main cutters during the coal extraction process. Cuttable Rock Bolts are recommended to prevent roof and face falls.
Keywords

Subjects


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Volume 19, Issue 64
Autumn 2024
Pages 43-64

  • Receive Date 19 November 2023
  • Revise Date 05 March 2024
  • Accept Date 07 May 2024