Numerical study of cracking process using a new contact model

Xiaobin Ding, Lianyang Zhang

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

Abstract

In this paper, the three dimensional Particle Flow Code (PFC3D) with a newly developed contact model which can properly consider the contribution of moment to contact normal and shear stresses and the condition at which the contact bond fails was used to investigate the cracking process of rocks containing single flaws and under uniaxial compression. The new contact model was first validated by using it to simulate the experimental cracking process of gypsum containing pre-existing single flaws at different inclination angles. Then the influence of flaw shape (length and thickness) on the cracking process was systematically studied and the key features were identified based on the simulations. The results indicate that the first cracks (usually called primary cracks) initiate from the boundary of the pre-existing flaw and are always caused by tensile failure, and the secondary cracks first emanate from the tips of the pre-existing flaw due to shear failure and then develop to a mixed shear and tensile cracking zone.

Original languageEnglish (US)
Title of host publication49th US Rock Mechanics / Geomechanics Symposium 2015
PublisherAmerican Rock Mechanics Association (ARMA)
Pages2188-2195
Number of pages8
Volume3
ISBN (Print)9781510810518
StatePublished - 2015
Event49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States
Duration: Jun 29 2015Jul 1 2015

Other

Other49th US Rock Mechanics / Geomechanics Symposium
CountryUnited States
CitySan Francisco
Period6/29/157/1/15

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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  • Cite this

    Ding, X., & Zhang, L. (2015). Numerical study of cracking process using a new contact model. In 49th US Rock Mechanics / Geomechanics Symposium 2015 (Vol. 3, pp. 2188-2195). American Rock Mechanics Association (ARMA).