Prediction of Cutting Speed of Surface Miner for Coal and Limestone Production under Varied Rock Mass Conditions

Abstract

The key function of surface miner is to mechanically excavate in-situ rock. Strength properties i.e. the resistance of the rock to break limits the cutting speed and in turn overall performance of the surface miner. Quantitative account of rock properties in relation to cutting speed of surface miner is essential for precise estimation of its net performance. A study encompassing operating parameters (cutting speed and depth of cut) of surface miner and rock/rock mass parameters were conducted in a few coal and limestone mines located in different parts of India. Intact rock and rock mass parameters were correlated with cutting speed of surface miners and also confirmed through principal component analysis. A multiple regression equation is developed based on these outcomes to predict cutting speed taking depth of cut into consideration. An empirical relation is also developed to predict the production after arriving at suitable operating conditions. An easy to use nomogram is developed for fixing the optimum cutting speed based on the studies carried out.