Critical dimension concept in pillar stability
T Unlu, E Unal, B Unver, E Tercan
proceeding (Uluslararası, Hakemli) | Yazar(lar): T Unlu, E Unal, B Unver, E Tercan | Yıl: 2001 | Dergi/Kurum: PROCEEDINGS OF THE SEVENTEENTH INTERNATIONAL MINING CONGRESS AND EXHIBITION OF TURKEY | İndeks: WOS.ISTP — Özet: This paper is based on a study carried out to investigate the stability and dimensioning of coal
This paper is based on a study carried out to investigate the stability and dimensioning of coal pillars at various depths. Critical dimensions for coal pillars are discussed. The results of the study show that the minimum width for small and/or yielding coal pillars should not be less than 10 metres. In the case of soft roof and/or especially soft floor strata conditions, special attention should be given to pillars with width-to-height ratios (W/H) between 4 and 10. Pillar strength increases as the pillar width is increased, depending on the geomechanical characteristics of the coal seam. However, after a certain W/H value, the strength of a coal pillar increases rapidly and it is almost impossible to yield the pillar completely.