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

研究成果: Contribution to journalConference article

7 引用 (Scopus)

抜粋

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.

元の言語英語
ページ(範囲)886-893
ページ数8
ジャーナルProcedia Engineering
191
DOI
出版物ステータス出版済み - 1 1 2017
イベントISRM European Rock Mechanics Symposium, EUROCK 2017 - Ostrava, チェコ共和国
継続期間: 6 20 20176 22 2017

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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