Modeling of crack initiation, propagation and coalescence in uniaxial compression

Citation
B. Vasarhelyi et A. Bobet, Modeling of crack initiation, propagation and coalescence in uniaxial compression, ROCK MECH R, 33(2), 2000, pp. 119-139
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geological Petroleum & Minig Engineering
Journal title
ROCK MECHANICS AND ROCK ENGINEERING
ISSN journal
0723-2632 → ACNP
Volume
33
Issue
2
Year of publication
2000
Pages
119 - 139
Database
ISI
SICI code
0723-2632(200004/06)33:2<119:MOCIPA>2.0.ZU;2-C
Abstract
Cracks that initiate from pre-existing discontinuities can link with other cracks or with other discontinuities and produce failure in a rock mass. Th e Displacement Discontinuity Method (DDM), FROCK, is used in this investiga tion to model experimental observations on pre-cracked specimens of gypsum. In these experiments two fractures, which were either both open or closed, were placed through the thickness of the specimens, and detailed observati ons of the cracking process were performed as the specimens were loaded in uniaxial compression. The following aspects are studied for both open and c losed fractures: 1) crack initiation stress; 2) direction and propagation o f the new cracks; 3) type of coalescence and stress at which it occurs. Mod eling is done considering the actual size of the specimens. Relations betwe en the direction of initiation for each type of crack, the orientation of t he initial fractures, and the type and coalescence are established. In addi tion, comparisons between results from experiments and predictions from the model are presented. The numerical results are in agreement with the exper iments.