Fracture characteristics of rocks under shear loading

John M Kemeny, Tae Young Ko, Seokwon Jeon

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Fracture problems in rock structures quite commonly involve shear loadings including in-plane shearing (mode II) or out-of-plane shearing (mode III). Even though a rock mass may be subjected to simple tension or shear loading, due to the complexity of the geometry and the random orientation of cracks in rocks, the crack growth occurs in mode II or mode III manner. In this study, the fracture toughness and strength of Coconino sandstone under in-plane and out-of-plane shear were determined experimentally. A short beam compression test was employed for in-plane shear loading and a circumferentially notched cylindrical specimen was employed for out-of-plane shear loading. In addition, the mode II fracture toughness and strength were determined at different loading rates to examine the effect of loading rate. As a result, the in-plane (mode II) shear strength was approximately 2 times higher than out-of-plane (mode III) shear strength. The mode II fracture toughness was approximately 1.78 times higher than the mode III fracture toughness. As the loading rate increases, the mode II fracture toughness and the shear strength also increase.

Original languageEnglish (US)
Pages (from-to)760-764
Number of pages5
JournalKSCE Journal of Civil Engineering
Volume18
Issue number3
DOIs
StatePublished - 2014

Fingerprint

Fracture toughness
Rocks
Shear strength
Shearing
Sandstone
Crack propagation
Cracks
Geometry

Keywords

  • circumferentially notched cylindrical specimen
  • fracture toughness
  • mode II and mode III
  • shear strength
  • short beam compression test

ASJC Scopus subject areas

  • Civil and Structural Engineering

Cite this

Fracture characteristics of rocks under shear loading. / Kemeny, John M; Ko, Tae Young; Jeon, Seokwon.

In: KSCE Journal of Civil Engineering, Vol. 18, No. 3, 2014, p. 760-764.

Research output: Contribution to journalArticle

Kemeny, John M ; Ko, Tae Young ; Jeon, Seokwon. / Fracture characteristics of rocks under shear loading. In: KSCE Journal of Civil Engineering. 2014 ; Vol. 18, No. 3. pp. 760-764.
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