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Influences of Microscopic Factors on Macroscopic Strength and Stiffness of Inter-Layered Rocks — Revealed by a Bonded Particle Model

Published online by Cambridge University Press:  05 May 2011

F.-S. Jeng ,
T.-T. Wang ,
H. H. Li  and
T.-H. Huang
F.-S. Jeng*
Affiliation:
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
T.-T. Wang*
Affiliation:
Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan 10608, R.O.C.
H. H. Li*
Affiliation:
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
T.-H. Huang*
Affiliation:
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
*
* Professor
** Asistant Professor
*** Ph.D.
* Professor
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Abstract

Since a conventional petrographic analysis does not allow a systematic and detailed study on how the microscopic factors affect the macroscopic behavior of inter-layered rocks, this research adopted a numerical model, the bonded particle model, to explore the micro-mechanisms associated with the strength and stiffness of inter-layered rocks. The model was first calibrated by comparing the simulations to the actual behavior until they tally with each other. Following, the microscopic factors, including the bond strength, the bond stiffness, type of bonds and friction of particles and type of bond stiffness, are varied to study their influences. As expected, the bond strength and the bond stiffness are found to have a direct and significant influence on the macroscopic uniaxial compressive strength and stiffness, respectively. Furthermore, close observations on the breaking of bonds during the loading process reveal interesting phenomena, including the transition of shear/normal bond breaking, the type of internal fracture and the factors controlling internal failure, etc. These phenomena enlighten the interpretations about the micromechanisms accounting for the macroscopic strength and stiffness of inter-layered rocks.

Keywords

Inter-layered rockBonded particle modelStrengthStiffnessMicroscopic mechanismNumerical analysis
Type
Articles
Information
Journal of Mechanics , Volume 24 , Issue 4 , December 2008 , pp. 379 - 389
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2008

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