Experimental research on pre-cracked marble under compression

Li, Yinping; Chen, Longzhu; Yuan-han, Wang

doi:10.1016/j.ijsolstr.2004.09.033

Cited by 352 publications

(142 citation statements)

References 13 publications

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“…The number of AE occurrences are commonly increased just before solids is destructed: the stress of rock reach to uniaxial compressive strength in uniaxial compressive test. AE monitoring is, therefore, used in the field of rock mechanics, concrete, and mining to predict the damage and the failure of brittle materials because they reach structural failure by accumulating microfracture [18][19][20][21][22]. As many AE activities can be detected attributable to thermal stress during UCG process [23], it is also useful to estimate the progress of gasification process and special events such as collapse of coal in the cavity and extensive propagation of gasification zone.…”

Section: Methodsmentioning

confidence: 99%

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Hamanaka

Itakura

et al. 2017

Energies

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Underground coal gasification (UCG) is a technique to recover coal energy without mining by converting coal into a valuable gas. Model UCG experiments on a laboratory scale were carried out under a low flow rate (6~12 L/min) and a high flow rate (15~30 L/min) with a constant oxygen concentration. During the experiments, the coal temperature was higher and the fracturing events were more active under the high flow rate. Additionally, the gasification efficiency, which means the conversion efficiency of the gasified coal to the product gas, was 71.22% in the low flow rate and 82.42% in the high flow rate. These results suggest that the energy recovery rate with the UCG process can be improved by the increase of the reaction temperature and the promotion of the gasification area.

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Section: Methodsmentioning

confidence: 99%

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Hamanaka

Itakura

et al. 2017

Energies

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“…In general, it is accepted that tensile cracks grow initially at an angle with respect to the direction of the compressive stress, and then rapidly grow in the direction of the compressive stress [12,13,14]. The fracture stresses for Mode I, Mode II and mixed Mode I-II compressive loading can be found similarly to those for tension loading by using the three fracture criteria used in fracture mechanics [15].…”

Section: Kc=σ√πamentioning

confidence: 99%

Kırılgan Malzemelerin Çekme ve Makaslama Kırılmaları Üzerinde Deneysel ve Sayısal Çalışmalar

Erarslan

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Sudden and violent fracturing of brittle materials, such as rocks and concretes, still remain one of the leading causes of fatalities in mining, civil and geotechnical industries today. The primary aim of this study is to investigate the mixed modes, mode I (tensile) and mode II (shearing) fracturing mechanisms of rock and prepared concrete specimens using Crack Chevron Notched Brazillian Disc (CCNBD) specimen geometries. Static diametrical compression tests showed that the notched cracks at the centre of the specimens opened (Mode I) up to 30 crack inclination angle (β), whereas crack closure started for β > 33, and closure became more pronounced at even higher β of 45 and 70. A series of numerical analyses were then performed by using a Finite Element Method (FEM) software FRANC2D to simulate the stress distributions and fracturing behaviour of the samples at different β, and to obtain the Mode I and Mode II fracture toughness values K Ic and K IIc respectively. According to the numerical results, it was unlikely to obtain pure Modes I and II using both the CCNBD specimens under diametral compressive loading. Furthermore, the numerical simulations also suggested that K Ic was more effective on crack initiation than K IIc ; whereas, at the onset of crack propagation, the opposite was the case. Keywords

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“…To better understand the mechanical behavior of jointed rock or rock-like materials, substantial experimental efforts have been devoted to the study of crack initiation, propagation, and failure modes of precracked rocks or rock-like specimens. Many kinds of joint geometries have been considered in previous works, such as joint inclination angle [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], joint distance [3,[15][16][17][18], and overlap distance [17][18][19]. At the same time, there are many kinds of materials that have been used by scholars, such as glass [5], Columbia Resin 39 [20], and molded gypsum [15,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, there are many kinds of materials that have been used by scholars, such as glass [5], Columbia Resin 39 [20], and molded gypsum [15,[21][22][23][24]. Previous studies have shown that there are mainly two kinds of cracks developed from the tips of preexisting fissure: wing crack and secondary crack [4,8,11,21,22]. For the coalescence mode between fissures, it can be classified into three types: tensile mode; shear mode; mixed mode [1, 2, 7-15, 19, 22].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Failure Behavior and Energy Mechanics of Rock-Like Materials Containing Multiple Joints

Cao

Lin

2017

Advances in Materials Science and Engineering

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This paper investigates the influence of joint geometry parameters on the characteristic stress, failure pattern, and energy mechanism of multiple jointed rock-like specimens under uniaxial compression. Both the laboratory and numerical results show that the higher value of UCS occurs when is around 0 ∘ and changes from 15 ∘ to 30 ∘ or when is around 30 ∘ and changes from 45 ∘ to 75 ∘ . However, the lowest value appears when is around 45 ∘ and changes from 15 ∘ to 30 ∘ . The CDiS (critical dilatancy stress) and CIS (crack initiation stress) show a similar tendency to UCS. Moreover, the specimens present different failure modes for various levels of , , and , and the failure mode can be classified into four categories: stepped path failure; failure through parallel plane; failure through cross plane; material failure. In addition, with higher strength, the input energy and strain energy are higher than those with lower strength. Dissipation energy is affected by the failure modes of the specimens. At the same time, when changes from 0.2 to 0.6, the boundary energy, strain energy, and dissipation energy show a decreasing trend.

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Experimental research on pre-cracked marble under compression

Cited by 352 publications

References 13 publications

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Kırılgan Malzemelerin Çekme ve Makaslama Kırılmaları Üzerinde Deneysel ve Sayısal Çalışmalar

Experimental and Numerical Study of Failure Behavior and Energy Mechanics of Rock-Like Materials Containing Multiple Joints

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