Estimation of Mode i Fracture Toughness of Rock by Semi-Circular Bend Test under Confining Pressure Condition

Minami Kataoka, Eqlima Mahdavi, Takahiro Funatsu, Takashi Takehara, Yuzo Obara, Katsunori Fukui, Kimihiro Hashiba

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

It is essential to understand the mode I fracture toughness of rock under in situ conditions found underground, such as confining pressure, for assessment of the stability of underground rock structures. Some researchers have performed several types of fracture toughness tests of rocks under confining pressure condition. However, the ordinary fracture toughness tests do not consider the effect of confining pressure in their estimation equations. A modified estimation equation for the mode I fracture toughness of rock under confining pressure condition was suggested in this study. This study was intended for the semi-circular bend (SCB) test, which is one of the ISRM-suggested methods for determining the mode I fracture toughness of rock. The SCB test under various confining pressures from 0 to 10 MPa was performed using Kimachi sandstone. A finite element analysis of the SCB test considering several confining pressure conditions was performed to calculate the stress intensity factor. Based on the numerical simulation results, the modification of the fracture toughness estimation was suggested. Applicability of the suggested estimation was discussed with comparing the mode I fracture toughness of the rock obtained in this study and previous research.

Original languageEnglish
Pages (from-to)886-893
Number of pages8
JournalProcedia Engineering
Volume191
DOIs
Publication statusPublished - Jan 1 2017
EventISRM European Rock Mechanics Symposium, EUROCK 2017 - Ostrava, Czech Republic
Duration: Jun 20 2017Jun 22 2017

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Fracture toughness
Rocks
Sandstone
Stress intensity factors
Finite element method
Computer simulation

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Estimation of Mode i Fracture Toughness of Rock by Semi-Circular Bend Test under Confining Pressure Condition. / Kataoka, Minami; Mahdavi, Eqlima; Funatsu, Takahiro; Takehara, Takashi; Obara, Yuzo; Fukui, Katsunori; Hashiba, Kimihiro.

In: Procedia Engineering, Vol. 191, 01.01.2017, p. 886-893.

Research output: Contribution to journalConference article

Kataoka, M, Mahdavi, E, Funatsu, T, Takehara, T, Obara, Y, Fukui, K & Hashiba, K 2017, 'Estimation of Mode i Fracture Toughness of Rock by Semi-Circular Bend Test under Confining Pressure Condition', Procedia Engineering, vol. 191, pp. 886-893. https://doi.org/10.1016/j.proeng.2017.05.258
Kataoka, Minami ; Mahdavi, Eqlima ; Funatsu, Takahiro ; Takehara, Takashi ; Obara, Yuzo ; Fukui, Katsunori ; Hashiba, Kimihiro. / Estimation of Mode i Fracture Toughness of Rock by Semi-Circular Bend Test under Confining Pressure Condition. In: Procedia Engineering. 2017 ; Vol. 191. pp. 886-893.
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