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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Structural Engineering and Mechanics, An Int'l Journal Structural Engineering and Mechanics, An Int'l Journal Vol.79 No.2
- 발행연도
- 2021.1
- 수록면
- 237 - 245 (9page)
이용수
초록· 키워드
오류제보하기
There is normally the occurrence of pre-existing cracks and holes in coal mass to influence its mechanical behaviours. And the crack initiation and propagation around the tip of pre-existing cracks can be observed to induce the overall failure of coal mass finally. In this study, two groups of hole with the radius of 10mm connecting one crack with length and width of 20 mm and 1 mm, respectively, were pre-existed in sample to explore the influence of crack angle (from 0 to 90°) on the unconfined compressive strength (UCS), crack initiation and propagation, and failure modes of coal mass with combined faults by using RFPA2D. The results showed that the stress-strain curves of specimen with double-hole-crack exhibit multiple stress drop compared to that of intact coal sample, especially in the post-peak stage. Moreover, UCS decreased firstly with the crack angle increasing to 30° and then increased until the crack angle reaching to 75° following by decreasing with the continuous increase of crack angle to 90°. In addition, the failure mode of double-hole-crack specimen with the crack angle of 0- 30° can be regards as the dominated tensile failure combined with shear failure, which was consist with the failure pattern of intact specimen. On the other hand, the failure mode of double-hole-crack specimen with the crack angle of 45-90° is the dominated shear failure combined with tensile failure. Meanwhile, the distribution characteristics of acoustic emission energy can be used to better reflect the deformation and failure process of coal mass with combined defects.
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참고문헌 (47)
참고문헌 신청
Ai, D. / 2019 / Experimental and numerical investigation of crack propagation and dynamic properties of rock in SHPB indirect tension test / Int. J. Impact. Eng 126:135~146
Aria, M. / 2018 / Testing and numerical simulation of a medium strength rock material under unconfined compression loading / J. Rock Mech. Geotech 10(2):5~19
Benouis Ali / 2015 / Numerical analysis of crack propagation in cement PMMA: application of SED approach / Structural Engineering and Mechanics, An Int＇l Journal 55(1):93~109
Beráková, A. / 2020 / Mechanical properties and failure patterns of migmatized gneiss with metamorphic foliation under ucs test / Rock Mech. Rock Eng 53(4):2007~2013
Bobet, A. / 2000 / The initiation of secondary cracks in compression / Eng. Fract. Mech 66(2):187~219
Aria, M. / 2018 / Testing and numerical simulation of a medium strength rock material under unconfined compression loading / J. Rock Mech. Geotech 10(2):5~19
Benouis Ali / 2015 / Numerical analysis of crack propagation in cement PMMA: application of SED approach / Structural Engineering and Mechanics, An Int＇l Journal 55(1):93~109
Beráková, A. / 2020 / Mechanical properties and failure patterns of migmatized gneiss with metamorphic foliation under ucs test / Rock Mech. Rock Eng 53(4):2007~2013
Bobet, A. / 2000 / The initiation of secondary cracks in compression / Eng. Fract. Mech 66(2):187~219
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