o:247 Optimization of Coal Overburden Excavation Considering Variable Geomechanical Properties and States of Excavator Teeth en We examine the impact of overburden geomechanical properties on the velocity of the excavator rotary movement Vb and on the excavator current consumption Imax for two different states of excavator teeth: new excavator teeth and worn-out teeth after minimum 250h of work. The analysed dataset is collected from recordings made by the bucket-wheel excavator SchRs 900 25/6 operating at “Tamnava Eastern field” open-pit coal mine in Serbia. The following geomechanical properties of the overburden are examined: grain size composition, unit weight, cohesion and angle of internal friction. Using multiple linear regression analysis, we develop explicit mathematical correlations between Imax and Vb and the overburden properties in a form of nonlinear equations for the case of new excavator teeth, while statistically significant correlation for the worn-out teeth is obtained only between overburden geomechanical properties and Imax. Results obtained indicate the existence of statistically significant two-factor interactions with positive effect of overburden unit weight and angle of internal friction on Imax and Vb, while cohesion is generally inversely proportional to the analysed outputs. Analysis performed enables optimized planning of the excavator performance regarding its productivity during the overburden excavation. current consumption; velocity of excavator rotary movement; excavator teeth; overburden properties; optimization 1552099 10.24425/ams.2022.140706 1552101 0860-7001 1552102 https://journals.pan.pl/dlibra/publication/140706/edition/122703/content 2022-05-10T10:32:50.709Z 44 yes 46 Srđan Kostić Institut za vodoprivredu “Jaroslav Černi” 0000-0002-3705-3080 Jelena Trivan University of Banja Luka, Faculty of Mining, Prijedor, Bosnia and Herzegovina person 0000-0001-6697-5538 application/pdf 6191006 https://unilib.phaidrabg.rs/o:247 no yes 17 70 92000001 71A04 Archive of Mining Sciences 67 1 123 142 Polish Scientific Publishers P W N 2022