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Numerical modelling of heat shock‐assisted rock fracture

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Details

Original languageEnglish
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
DOIs
Publication statusE-pub ahead of print - 29 Oct 2019
Publication typeA1 Journal article-refereed

Abstract

This paper presents a numerical investigation on the effects of thermal shock as a pretreatment of rock prior to comminution. More specifically, the effect of heat shock‐induced cracks on the uniaxial compressive strength of rock is numerically studied. The chosen constitutive model of rock employs a (strong) embedded discontinuity finite element formulation to describe cracks. The thermomechanical problem that governs the heat shock pretreatment of rocks is considered as an uncoupled problem because of a highly dominating role of the external heat influx. Two solution methods of the global problem are presented: an explicit‐explicit dynamic scheme and an implicit‐implicit quasi‐static scheme. The model performance is tested in simulations on heterogeneous numerical rock samples subjected first to a heat shock pretreatment and then to a mechanical compression test. According to the results, the compressive strength of intact granite rock having the axial splitting failure mode can be substantially reduced by heat shock pretreatment.

Publication forum classification

Field of science, Statistics Finland