Effect of model scale on mechanical properties of rocks based on PFC3D modeling

Xiaobin Ding, Lianyang Zhang

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

1 Scopus citations

Abstract

This paper studies the effect of model scale on the simulated mechanical properties based on PFC3D modeling. The uniaxial compression tests of intact rocks are simulated. Three different particle size ratios, all having a uniform particle size distribution and the same average diameter, are considered. For all simulations, the same model length to diameter ratio of 2 and the same microscopic mechanical properties are utilized. By changing the model size represented by the model length to the average particle diameter ratio (L/d) at each particle size ratio, the unconfined compressive strength (UCS), Young's elastic modulus (E), and Poisson's ratio are determined based on the PFC3D simulations. The results show that the coefficients of variation of the simulated mechanical properties in PFC3D decrease significantly as L/d increases. To reach a specific variation level for the simulation results, the related minimum model size should be used. The results also show that both UCS and E increase with larger L/d, although the rate of increase decreases with L/d. The analysis indicates that the increase is caused by the decrease of model porosity with larger L/d. As for the Poisson's ratio, the scale effect can be ignored when L/d is large enough.

Original languageEnglish (US)
Title of host publication46th US Rock Mechanics / Geomechanics Symposium 2012
Pages2750-2756
Number of pages7
StatePublished - 2012
Event46th US Rock Mechanics / Geomechanics Symposium 2012 - Chicago, IL, United States
Duration: Jun 24 2012Jun 27 2012

Publication series

Name46th US Rock Mechanics / Geomechanics Symposium 2012
Volume4

Other

Other46th US Rock Mechanics / Geomechanics Symposium 2012
CountryUnited States
CityChicago, IL
Period6/24/126/27/12

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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