An Experimental Study of Crack Coalescence Behaviour in Rock-Like Materials Containing Multiple Flaws Under Uniaxial Compression

Zhou, Xiaoping; Cheng, Hao; Feng, Ye

doi:10.1007/s00603-013-0511-7

Cited by 297 publications

(123 citation statements)

References 13 publications

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“…It is shown from Figure 7 that the peak strength at first decreased and then increased with increasing of the flaw angle. The behaviours are akin to those observed by Zhou et al [17], Yang and Jing [14], Xu et al [34], and Wasantha et al [35]. Meanwhile, the peak strength decreased gradually when length of preexisting crack increased.…”

Section: Stress-strain Characteristicssupporting

confidence: 77%

“…Meanwhile, the peak strength decreased gradually when length of preexisting crack increased. To show the extent of the reduction in peak strength of the model in relation to an intact specimen, the reduction degree (Yang et al, 2012) [17] is defined as…”

Section: Stress-strain Characteristicsmentioning

confidence: 99%

“…They found that the fissure angle has a key effect on the strength and deformation behaviour of sandstone samples under uniaxial compression, and the mechanical parameters (uniaxial compressive strength Young's modulus and peak axial strain) of flawed sandstone firstly decrease and then increase with increasing fissure angle. Zhou et al [17,18] conducted a series of uniaxial compression experiments and numerical simulation on rock-like materials (formed from a mixture of sand, plaster, limestone, and water at mass ratio of 126 : 9 : 9 : 16) containing multiple flaws (angle from 30 ∘ to 60 ∘ ) and concluded that the crack initiation modes depend on the flaw angle and the nonoverlapping length.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

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To investigate the crack behaviour of rock or rock-like material in uniaxial loading, a series of numerical simulations were conducted on gypsum specimens containing a single flaw with different inclination angle (0 ∘ -90 ∘ ) and length (10 mm-30 mm). Based on the numerical simulations results, the effect of flaw length on peak strength, the CI stress, and the CD stress were investigated with different inclination angles. The results show that the peak strength decreased initially and then increased with increasing of the flaw angle. Meanwhile, the peak strength decreased gradually when the length of the preexisting flaw increased. When the inclination angle was 30 ∘ , 45 ∘ , and 60 ∘ , the reduction degree of peak strength increased with increasing of the flaw length. The CI stress and CD stress not only depend on the inclination angle but also depend on flaw length. Four types of crack were observed in numerical simulations. The present research facilitates increased understanding of crack behaviour of rock under different conditions.

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Section: Stress-strain Characteristicssupporting

confidence: 77%

Section: Stress-strain Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

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“…It was observed that, for specimens with the same flaw inclination angle and stepping classification (right or left), the initiation stress of wing and secondary cracks depends on the overlap ratio and spacing among flaws (Sagong and Bobet 2002;Park and Bobet 2009;Zhou et al 2013). It was found that, for the same overlap ratio, specimens with rightstepping geometries have higher initiation stress for wing and secondary cracks than specimens with left-stepping geometries (Sagong and Bobet 2002;Park and Bobet 2009;Zhou et al 2013). Moreover, quasi-coplanar secondary cracks were observed for specimens with three flaws in left-stepping geometries.…”

Section: Introductionmentioning

confidence: 98%

Numerical Simulation of Crack Growth and Coalescence in Rock-Like Materials Containing Multiple Pre-existing Flaws

Zhou

2014

Rock Mech Rock Eng

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296

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A novel meshless numerical method, called general particle dynamics (GPD), is proposed to simulate samples of rock-like brittle heterogeneous material containing four preexisting flaws under uniaxial compressive loads. Numerical simulations are conducted to investigate the initiation, growth, and coalescence of cracks using a GPD code. An elasto-brittle damage model based on an extension of the Hoek-Brown strength criterion is applied to reflect crack initiation, growth, and coalescence and the macrofailure of the rock-like material. The preexisting flaws are simulated by empty particles. The particle is killed when its stresses satisfy the Hoek-Brown strength criterion, and the growth path of cracks is captured through the sequence of such damaged particles. A statistical approach is applied to model the heterogeneity of the rocklike material. It is found from the numerical results that samples containing four preexisting flaws may produce five types of cracks at or near the tips of preexisting flaws including wing, coplanar or quasi-coplanar secondary, oblique secondary, out-of-plane tensile, and out-of-plane shear cracks. Four coalescence modes are observed from the numerical results: tensile (T), compression (C), shear (S), and mixed tension/shear (TS). A higher load is required to induce crack coalescence in the shear mode (S) than the tensile (T) or mixed (TS) mode. It is concluded from the numerical results that crack coalescence occurs following the weakest coalescence path among all possible paths between any two flaws. The numerical results are in good agreement with reported experimental observations.

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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%

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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An Experimental Study of Crack Coalescence Behaviour in Rock-Like Materials Containing Multiple Flaws Under Uniaxial Compression

Cited by 297 publications

References 13 publications

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Numerical Simulation of Crack Growth and Coalescence in Rock-Like Materials Containing Multiple Pre-existing Flaws

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

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