Chain trenchers were employed to cut moderately strong sandstone bedrock of varying thicknesses (up to 5.1 m) beneath desert alluvium in Sedona, Arizona. Data on the case revealed an inverse relationship between trencher performance--expressed as a cutting rate or volume excavation rate--and the thickness of rock cut. This was compared with curves obtained from a simple balance of the cutting energy available from the trencher and the energy necessary to break a unit volume of rock. The closeness of the fit provided a basis for understanding the mechanics of chain-trencher cutting performance in rocks of different strengths and thicknesses. The author drew two conclusions: 1) the design of chain trenchers is such that power available for cutting remains constant and low, and 2) machine productivity related to traverse speed or excavation rate is inversely proportional to the strength and thickness of any rock cut.


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  • Accession Number: 00724385
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 5 1996 12:00AM