Wear of geo-materials by mechanical impulse

Y. Boneh, Z. Reches

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Shear along rock faults is always associated with wear of the sliding blocks that commonly results in the production of fine powder called gouge. We experimentally analyzed intensity of wear-rate and frictional strength during shear of dolomite and granite samples at slip-velocity of V = 0.001-1.0 m/s, and normal stresses of σn = 0.25-4.5 MPa. The experiments showed that the friction coefficients of these rocks depend on the mechanical power-density, which is the rate of energy dissipation during slip. The wear-rates, WR, showed dependency on the mechanical-impulse of the form WR = a · [τ/V]b where τ is shear stress, V is the slip-velocity, and a and b are material constants. This relation of wear-rate to loading indicates that for rocks, the Archard (1953) model is only a special case for low slip-velocity. We propose here a model based on microfracturing wear at stressed asperities that explains the observed dependency of wear-rates on the mechanical impulse.

Original languageEnglish
Title of host publication50th US Rock Mechanics / Geomechanics Symposium 2016
PublisherAmerican Rock Mechanics Association (ARMA)
Pages2973-2979
Number of pages7
ISBN (Electronic)9781510828025
StatePublished - 1 Jan 2016
Externally publishedYes
Event50th US Rock Mechanics / Geomechanics Symposium 2016 - Houston, United States
Duration: 26 Jun 201629 Jun 2016

Publication series

Name50th US Rock Mechanics / Geomechanics Symposium 2016
Volume4

Conference

Conference50th US Rock Mechanics / Geomechanics Symposium 2016
Country/TerritoryUnited States
CityHouston
Period26/06/1629/06/16

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