A model to predict the performance of drum shearers: An example from a Çayirhan lignite mine, Ankara, Central Turkey

A model to predict the cutting performance of drum shearer machine from a Çayirhan lignite mine, Ankara, Central Turkey was developed. The mechanism of fracture showed the relationship between cuttability and physico-mechanical properties of the coal. Coal strength properties were known to affect the support capability of coal pillars and the cuttability and grindability of coal. In-situ experimental studies were conducted at the Çayirhan underground lignite mine situated in the Beypazari Basin. The total extraction with a retreating longwall method was used in the Çayirhan coal mine. The thickness of the coal seam at the location of the experiment was 1.5m, so the area planning of tests was 72m2. The main measurement area was chosen from the middle part of the longwall face where the roof stress was systematic. Schmidt hammer tests were used at two different locations of the longwall faces at a total of eight coal faces.