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Thermal shock weakening of granite rock under dynamic loading: 3D numerical modeling based on embedded discontinuity finite elements

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Details

Original languageEnglish
Pages (from-to)1788-1811
Number of pages24
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume44
Issue number13
DOIs
Publication statusPublished - 2020
Publication typeA1 Journal article-refereed

Abstract

This paper presents a numerical study of thermal shock weakening of granite
rock under dynamic loading. A fully 3D numerical scheme based on a com-
bined continuum viscodamage-embedded discontinuity model and an explicit
scheme to solve the underlying thermomechanical problem was developed
and validated through numerical examples. First, the dynamic Brazilian disc
test is simulated on intact numerical rock. Then, thermal shock-induced crack-
ing due to a moving external heat flux boundary condition, mimicking experi-
ments based on plasma jet treatment, is numerically predicted. Finally,
numerical Brazilian disc test is conducted on the thermal shocked numerical
samples. The predicted and experimental weakening effects are in good agree-
ment demonstrating that the present modeling approach has good predictive
capabilities. The practical significance of the results is that heat shock pre-
treatment can substantially enhance rock gravel and rubble crushing.

Publication forum classification

Field of science, Statistics Finland