Three-dimensional brittle shear fracturing by tensile crack interaction

David Healy (), Richard R. Jones and Robert E. Holdsworth
Additional contact information
David Healy: University of Liverpool
Richard R. Jones: e-Science Research Institute
Robert E. Holdsworth: University of Durham

Nature, 2006, vol. 439, issue 7072, 64-67

Abstract: Abstract Faults in brittle rock are shear fractures formed through the interaction and coalescence of many tensile microcracks1,2,3. The geometry of these microcracks and their surrounding elastic stress fields control the orientation of the final shear fracture surfaces3,4. The classic Coulomb–Mohr failure criterion5 predicts the development of two conjugate (bimodal) shear planes that are inclined at an acute angle to the axis of maximum compressive stress. This criterion, however, is incapable of explaining the three-dimensional polymodal fault patterns that are widely observed in rocks6,7,8,9. Here we show that the elastic stress around tensile microcracks in three dimensions promotes a mutual interaction that produces brittle shear planes oriented obliquely to the remote principal stresses, and can therefore account for observed polymodal fault patterns. Our microcrack interaction model is based on the three-dimensional solution of Eshelby10,11, unlike previous models4,12 that employed two-dimensional approximations. Our model predicts that shear fractures formed by the coalescence of interacting mode I cracks will be inclined at a maximum of 26° to the axes of remote maximum and intermediate compression. An improved understanding of brittle shear failure in three dimensions has important implications for earthquake seismology and rock-mass stability, as well as fluid migration in fractured rocks13.

Date: 2006
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/nature04346 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:439:y:2006:i:7072:d:10.1038_nature04346

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/nature04346

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().