Mode ІІ fracture study of rocks using Brazilian disk specimens

Ayatollahi, M.R.; Sistaninia, M.

doi:10.1016/j.ijrmms.2011.04.017

Cited by 77 publications

(28 citation statements)

References 31 publications

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“…slices a–f in Figure ) that have different crack lengths between a 0 and a 1 . The crack growth law of the CSTBD specimen under mode II loading has already been fully explored in the work by Aliha et al and Ayatollahi and Sistaninia . In the CSTBD test, main cracks are always initiated at the notch tips and subsequently extend towards the loading ends.…”

Section: Discussionmentioning

confidence: 97%

“…The crack growth law of the CSTBD specimen under mode II loading has already been fully explored in the work by Aliha et al 59 and Ayatollahi and Sistaninia. 60 In the CSTBD test, main cracks are always initiated at the notch tips and subsequently extend towards the loading ends. The crack initiation angle and crack path depend on the normalized notch length and the notch inclination angle.…”

Section: Discussionmentioning

confidence: 99%

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Experimental and numerical investigation of cracked chevron notched Brazilian disc specimen for fracture toughness testing of rock

Wei

Dai

et al. 2017

Fatigue Fract Eng Mat Struct

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The cracked chevron notched Brazilian disc (CCNBD) specimen has been suggested by the International Society for Rock Mechanics to quantify mode I fracture toughness (K Ic ) of rock, and it has also been applied to mode II fracture toughness (K IIc ) testing in some research on the basis of some assumptions about the crack growth process in the specimen. However, the K Ic value measured using the CCNBD specimen is usually conservative, and the assumptions made in the mode II test are rarely assessed. In this study, both laboratory experiments and numerical modeling are performed to study the modes I and II CCNBD tests, and an acoustic emission technique is used to monitor the fracture processes of the specimens. A large fracture process zone and a length of subcritical crack growth are found to be key factors affecting the K Ic measurement using the CCNBD specimen. For the mode II CCNBD test, the crack growth process is actually quite different from the assumptions often made for determining the fracture toughness. The experimental and numerical results call for more attention on the realistic crack growth processes in rock fracture toughness specimens. KEYWORDS acoustic emission, CCNBD, crack growth, fracture process zone, fracture toughness | INTRODUCTIONRock masses in engineering activities usually have many structural defects, including cracks, flaws, cleavages and natural fractures. These weaknesses can intensify the mechanical discontinuity of rock when they are subjected to further mechanical and environmental actions and finally lead to the failure of rock masses. It is thus important to study the load-carrying capacity of cracked rock masses and to investigate the law of crack propagation in rock, for the purpose of guaranteeing the stability of rock structures, such as rock slopes and dam foundations. To describe the capacity of rock to resist crack propagation, rock fracture toughness is defined in rock fracture mechanics. It can be further subdivided into Nomenclature: AE, acoustic emission; a, crack length; a 0 , initial crack length; a 1 , final crack length; a c , critical crack length; B, thickness of specimen; BD, Brazilian disc; CB, chevron bend; CCNBD, cracked chevron notched Brazilian disc; CSTBD, cracked straight-through Brazilian disc; D, diameter of specimen; FPZ, fracture process

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Experimental and numerical investigation of cracked chevron notched Brazilian disc specimen for fracture toughness testing of rock

Wei

Dai

et al. 2017

Fatigue Fract Eng Mat Struct

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“…When the slope angle and bedding angle are large, the bending-collapse failure will occur [3]. At present, to bedding slope's failure pattern [4], most of the domestic and international research is based on a large number of statistical analyses of practical engineering slope's deformation situation [5]. Deng Ronggui [6]; Feng et al [7] has deduced the critical instability range of medium inclination bedding rock slope.…”

Section: Introductionmentioning

confidence: 99%

Study on Brazilian splitting test of bedding limestone slope deformation failure

Zhancheng

Yin

et al. 2017

Innov. Infrastruct. Solut.

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The slope along north section of the BeijingZhuhai expressway in Guangdong province is mainly limestone bedding slope. To reveal the relationship between the deformation failure modes of limestone slopes and the bedding angle of the strata, a targeted experimental research and theoretical analysis has been carried out, which provides a basis for the stability criterion of bedding limestone slope. In this paper, the slope samples along the expressway are selected and grouped according to different layer angle h, and the Brazilian disc splitting test has been carried out. According to the experiment, it is found that with the change of limestone bedding angle, five failure modes would occur: À When the bedding angle is between 0°and 30°, pure tensile failure occurs.`30°-45°, tensileslip type failure.´45°-75°, the slip-crack type failure.7 5°-90°, the slip type failure.˜h = 90°, the compression type failure. And the tensile strength of the limestone decreases as the bedding angle h changes from 0°to 90°. Secondly, the criterion of bedding limestone slope's overall slip failure and the partial slip-crack failure is deduced. The critical slope height equation of overall slip failure and the critical slope length equation of partial slip-crack failure are obtained. Finally, we have taken an application in a limestone slope which located in Guangdong Province Beijing-Zhuhai expressway north section. The theory agrees well with the actual stability of bedding limestone slope.

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“…Ayatollahi et al 2006, 2011aAyatollahi & Aliha, 2008a,b, 2009aAyatollahi & Sistaninia, 2011;Saghafi et al, 2010). In notched domains, most of the researches have been focused on the brittle fracture of V and U-shaped notches.…”

Section: Introductionmentioning

confidence: 99%

The Equivalent Material Concept: Application to failure of O-notches

Torabi¹

2013

10.5267/j.esm

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Mode ІІ fracture study of rocks using Brazilian disk specimens

Cited by 77 publications

References 31 publications

Experimental and numerical investigation of cracked chevron notched Brazilian disc specimen for fracture toughness testing of rock

Experimental and numerical investigation of cracked chevron notched Brazilian disc specimen for fracture toughness testing of rock

Study on Brazilian splitting test of bedding limestone slope deformation failure

The Equivalent Material Concept: Application to failure of O-notches

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