Investigation of the effects of coal seam slope and top coal drawn height on top coal recovery ratio in longwall top coal caving method applied in steep inclined thick coal seams


Celik A., ÖZÇELİK Y.

ARABIAN JOURNAL OF GEOSCIENCES, vol.15, no.2, 2022 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 2
  • Publication Date: 2022
  • Doi Number: 10.1007/s12517-022-09466-9
  • Journal Name: ARABIAN JOURNAL OF GEOSCIENCES
  • Journal Indexes: Science Citation Index Expanded, Scopus, Agricultural & Environmental Science Database, Aquatic Science & Fisheries Abstracts (ASFA), Geobase, INSPEC
  • Keywords: Longwall top coal caving, Steeply inclined thick coal seam, Physical model, Top coal recovery ratio, Rock mixture ratio

Abstract

In the longwall top coal caving method applied in steeply inclined thick coal seams, top coal loss zone is formed above the tail part of the face depending on the coal seam slope and the top coal drawing height, and the coal loss in this region causes the top coal recovery rate to decrease significantly. In this study, the effects of coal seam slope and top coal drawn height on top coal recovery rate in longwall top coal caving method applied in steeply inclined thick coal seams were investigated using a physical model developed by the authors. The physical model was first used in laboratory tests after being tested with the data obtained from field studies conducted at Alpagut Dodurga Lignite Enterprises. Eleven experiments were conducted with the physical model to determine the effect of the coal seam slope and the top coal drawn height on the top coal recovery rate. As a result of the experiments carried out, it was determined that the top coal recovery ratio increased due to the steepening of the coal seam slope and the top coal recovery ratio decreased due to the increase in the top coal drawn height.