Review of Cuttability Indices and A New Rockmass Classification Approach for Selection of Surface Miners |
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Authors: | Kaushik Dey A K Ghose |
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Institution: | (1) Indian School of Mines, Dhanbad, India |
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Abstract: | Rock excavation is carried out either by drilling and blasting or using rock-cutting machines like rippers, bucket wheel excavators,
surface miners, road headers etc. Economics of mechanised rock excavation by rock-cutting machines largely depends on the
achieved production rates. Thus, assessment of the performance (productivity) is important prior to deploying a rock-cutting
machine. In doing so, several researchers have classified rockmass in different ways and have developed cuttability indices
to correlate machine performance directly. However, most of these indices were developed to assess the performance of road
headers/tunnel-boring machines apart from a few that were developed in the earlier days when the ripper was a popular excavating
equipment. Presently, around 400 surface miners are in operation around the world amongst which, 105 are in India. Until now,
no rockmass classification system is available to assess the performance of surface miners. Surface miners are being deployed
largely on trial and error basis or based on the performance charts provided by the manufacturer. In this context, it is logical
to establish a suitable cuttability index to predict the performance of surface miners. In this present paper, the existing
cuttability indices are reviewed and a new cuttability indexes proposed. A new relationship is also developed to predict the
output from surface miners using the proposed cuttability index. |
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