Relationship between key rock properties and Cerchar abrasivity index for estimation of disc cutter wear life in rock tunneling applications

T. Massalov, S. Yagiz, J. Rostami

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Disc cutters are the dominant cutting tools used on tunnel boring machines (TBM), as well as many other mechanical excavation units. One approach to estimate disc cutter wear life is to use Cerchar Abrasivity index (CAI). In this paper, the relationship between key rock properties including uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS), density (D) and brittleness index (BI) of rock and Cerchar abrasivity index (CAI) are evaluated. For this aim, 80 mechanized tunnel cases was examined and dataset was established, and then simple and multiple linear regression analysis were carried out to obtain the possible relations between CAI and relevant rock properties. It is found that each rock property mentioned herein have an influence on the CAI that is one of the main rock properties to estimate cutter wear life, however none of them by itself is not enough to estimate the CAI. So, the best equation was obtained via multiple regression analysis to estimate CAI as a function of BTS, D and BI of rock with correlation coefficient of r=0.81. The limited study shows that while CAI is one of the good indicators to estimate the cutter wear, rock properties including UCS, BTS, D and BI also have a great influence on disc cutter wear.

Original languageEnglish
Title of host publicationISRM International Symposium - EUROCK 2020
EditorsC.C. Li, H. Odegaard, A.H. Hoien, J. Macias
PublisherInternational Society for Rock Mechanics
ISBN (Electronic)9788282080729
Publication statusPublished - Jun 2020
EventISRM International Symposium - EUROCK 2020 - Trondheim, Virtual, Norway
Duration: Jun 14 2020Jun 19 2020

Publication series

NameISRM International Symposium - EUROCK 2020


ConferenceISRM International Symposium - EUROCK 2020
CityTrondheim, Virtual


  • Brittleness
  • Cerchar abrasivity index
  • Cutter weariness
  • Rock properties

ASJC Scopus subject areas

  • Geochemistry and Petrology

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