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One of the promising cutting techniques in roadheading is the production of grooves in the rock by using water jets of high speed and narrow diameter under addition of solid abrasives. The experiments allow the technical and economic evaluation of 52 different abrasives of varying hardness, grain size, grain shape, and density, used for cutting into sandstone. Different types of corundum performed best, while quartz sands proved to yield the most favourable cost effectiveness. The dependence of the performance of abrasive water jets on dosage of abrasives, cutting speed, water pressure, nozzle diameter, ejection pipe diameter, ejection pipe length, and impact angle of the cutting jet on the rock were tested. All this allowed optimized application of the cutting technique with due consideration of technical and economic restrictions as well as of the specific intended use; it furthermore contributed greatly to enhancing scientific knowledge on the mechanisms during abrasive water jet cutting. Concepts of a roadheading system using abrasive water jets were established and a relevant rotating cutterhead constructed.

Additional information

Authors: HESSLING M, Bergbau-Forschung GmbH, Essen (DE)
Bibliographic Reference: EUR 11903 DE (1988)
Availability: (2)
Record Number: 198910042 / Last updated on: 1994-12-01
Original language: de
Available languages: de
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