Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 34, Issue -, Pages 124-134Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2012.11.009
Keywords
Linear rock cutting; Drag pick; Coarseness index; Absolute size constant; Saturation; Specific Energy
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A permeable quartzose sandstone was subjected to full-scale cutting tests under a chisel-type drag pick, in both dry and fully saturated conditions. Contrary to the results observed from disc cutting tests in the same setup with the same rock (Abu Bakar and Gertsch, 2011), saturation actually increased the cutting (drag) and normal (vertical) forces by 9.9% and 9.4%, respectively. The specific energy of cutting also was greater in the saturated samples, by 28%. More expectedly, the relation of fracture surface area to specific energy was confirmed through several descriptors of chip size distribution, including the Rosin-Rammler x' parameter, and the empirical coarseness index. An inverse power relation between coarseness index and specific energy was also confirmed. (c) 2012 Elsevier Ltd. All rights reserved.
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