How to determine the cutting power when cutting rock, a recipe

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

When estimating rock cutting projects, it is always difficult to determine the required power. Many theories are available, but which one to use. The Evans theory is suitable for tensile failure. Nishimatsu and Merchant are suitable for shear failure. But which type of failure will occur under which circumstances. The Miedema theory allows a mix of tensile failure and shear failure, named the Chip Type. This mechanism will mostly occur with medium blade angles (around 60°) and certain BTS to UCS ratios. In oil drilling with very large blade angles the Chip Type will never occur. Here a step by step approach is presented how to determine the mechanism occurring and how to determine the cutting forces, cutting power and specific energy. First of all, the required rock mechanical parameters are discussed. Then the possible mechanisms are discussed. Engineers are used to problems with one solution, however in rock cutting there are more solutions given a certain set of inputs, depending on the cutting history. So how does this work. At the end the reader is capable of carrying out a production estimation of rock cutting project.

Original languageEnglish
Title of host publicationProceedings 22nd World Dredging Congress
Subtitle of host publicationWODCON 2019
PublisherChinese Dredging Association (CHIDA)
Pages89-107
Publication statusPublished - 2019
Event22nd World Dredging Congress and Exposition, WODCON 2019 - Shanghai, China
Duration: 22 Apr 201926 Apr 2019

Conference

Conference22nd World Dredging Congress and Exposition, WODCON 2019
CountryChina
CityShanghai
Period22/04/1926/04/19

Keywords

  • Rock cutting
  • Shear failure
  • Tensile failure
  • The chip type

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