An experimental investigation on strength, deformation and crack evolution behavior of sandstone containing two oval flaws under uniaxial compression

Yang, Sheng‐Qi; Huang, Yan; Tian, Wen Ling; Zhu, Jianbo

doi:10.1016/j.enggeo.2016.12.004

Cited by 168 publications

(50 citation statements)

References 21 publications

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“…Da Huang et al [31] used the ANSYS AUTODYN-2D and investigated the crack initiation and propagation in three types of precracked sandstone specimens under conventional triaxial compression. In Figure 27, the comparison between numerical and experimental results is shown.…”

Section: Fem or Xfemmentioning

confidence: 99%

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

Cao

Lin

Fan

et al. 2019

Advances in Civil Engineering

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Rock masses are heterogeneous materials containing a large number of discontinuities, and the failure of the natural rock mass is induced by the crack propagation and coalescence of discontinuities, especially for the rock mass around tunnel or underground space. Because the deformation or failure process of jointed rock mass exhibits strongly nonlinear characteristics, it is also very difficult to predict the strength and failure modes of the rock mass. Therefore, it is very necessary to study the failure mechanisms of jointed rock mass under different stress conditions. Apart from the stress condition, the discontinuities geometry also has a significant influence on the mechanical behavior of jointed rock mass. Then, substantial, experimental, and numerical efforts have been devoted to the study of crack initiation, propagation, and coalescence of rock or rock-like specimens containing different kinds of joints or fissures. The purpose of this review is to discuss the development and the contribution of the experiment test and numerical simulation in failure behavior of jointed rock or rock-like specimens. Overall, this review can be classified into three parts. It begins by briefly explaining the significance of studying these topics. Afterwards, the experimental and numerical studies on the strength, deformation, and failure characteristics of jointed rock or rock-like materials are carried out and discussed.

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Section: Fem or Xfemmentioning

confidence: 99%

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

Cao

Lin

Fan

et al. 2019

Advances in Civil Engineering

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show abstract

“…Some studies about multiple crack fracture behavior under static loading have been performed in different rock-like materials either by numerical simulation, [18][19][20][21][22][23] by experiment [24][25][26][27][28] or by combining both of them. [29][30][31][32][33] Nasri et al 22 used the extended finite element method to analysis the interaction effect between two cracks under tensile load, but experimental study was not carried out due to the limitation of experimental technology. Yin et al 27 studied the coalescence behavior of two parallel pre-existing surface cracks in granite under compression.…”

Section: Introductionmentioning

confidence: 99%

“…In the study of the fracture mechanism of multiple cracks under static loads, some researchers used cubic or rectangular specimens containing two or three cracks under compression, [19][20][21][22][24][25][26][27][28]30 and some researchers used Brazilian disc specimens under compression. 29,[31][32][33] However, for multiple cracks under dynamic loading, no mature configuration specimen is available, and the corresponding experimental study under dynamic load, such as impact and blast, have little achievements.…”

Section: Introductionmentioning

confidence: 99%

The effect of a pre‐existing crack on a running crack in brittle material under dynamic loads

Zhou

Zhu

Wang

et al. 2019

Fatigue Fract Eng Mat Struct

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Brittle material usually contains plenty of cracks or micro‐cracks, which raises a question that how a pre‐existing crack affects a running crack as they are approaching. In order to investigate such issue, impact experiments were conducted by using double crack semi‐circle (DCSC) specimens. Polymethyl methacrylate (PMMA) was selected to make the DCSC specimens, and a modified SHPB system was used to perform the impact tests. The finite difference code AUTODYN was employed to simulate the crack propagation behavior and propagation path, and the simulated crack paths agree well with the impact test results. Meanwhile the stresses around the crack tips were analyzed and the crack propagation direction was investigated. To calculate the crack dynamic stress intensity factors (DSIFs), finite element code ABAQUS was employed. The results show that the spacing D between the vertical crack tip and the inclined crack center affects the stress distribution and fracture behavior of the vertical crack largely. As the vertical crack approaches the inclined crack, the crack speed is slow down, and tensile stress appears at the inclined crack tip. As the spacing D is small than 50 mm, the vertical crack connects with the middle area of the inclined crack. As the spacing D is 50 mm, the vertical crack connects with either the middle area or the upper tip of the inclined crack. As the spacing D is larger than 50 mm, the vertical crack coalesces with the upper crack tip.

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“…en, the extensive studies have been performed on cracking failure processes evolution from pre-existing discontinuities that emerged in brittle materials. And a series of fracture experimental tests were conducted to study crack initiation, propagation, and coalescence under compressive diametric or cyclic uniaxial compression loading using precracked specimens or intermittently joint rock models [9][10][11][12][13][14][15][16]. e crack propagation patterns usually obtained in previous studies of brittle material contain pre-existing flaws under uniaxial compression loading, as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Crack Initiation, Propagation, and Coalescence Experiments in Sandstone Brazilian Disks Containing Pre‐Existing Flaws

Zhao

Zhang

Liu

2019

Advances in Civil Engineering

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is study aims to investigate the fracture behaviors of cracks and crack systems in Brazilian disk (BD) sandstone specimens under compressive line loading. We conduct a series of rock fracture experiments to investigate crack initiation, propagation, and coalescence in samples with one or more pre-existing flaws under radial compressive stress. e displacements and failure loads of the tested specimens are measured. Experimental results show that there are two main types of cracks growing from the preexisting flaws: wing cracks and secondary cracks. Both initiate mostly from the tips of the pre-existing flaws and propagate in a stable manner. e results reveal that wing cracks appear first and propagate toward the loading direction. Secondary cracks can form in some multiple pre-cracked cases after wing cracks are already present. We also provide a characterization of the observed crack propagation paths and patterns and discuss the influence of pre-existing crack or crack systems. e results help in investigating the failure mechanisms and mechanical properties of rock or rock-like materials.

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An experimental investigation on strength, deformation and crack evolution behavior of sandstone containing two oval flaws under uniaxial compression

Cited by 168 publications

References 21 publications

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

The effect of a pre‐existing crack on a running crack in brittle material under dynamic loads

Crack Initiation, Propagation, and Coalescence Experiments in Sandstone Brazilian Disks Containing Pre‐Existing Flaws

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