Deformation localization and cracking processes of sandstone containing two flaws of different geometric arrangements

Lei, Ruide; Zhang, Zhenyu; Ge, Zhaolong; Berto, Filippo; Wang, Gang; Zhou, Lei

doi:10.1111/ffe.13259

Cited by 16 publications

(10 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…al used three-dimensional digital image correlation and acoustic emission technology to study the full-eld strain and progressive cracking process. They also analyzed the deformation localization and damage characteristics of sandstone with two different geometrical defects under uniaxial compression (Lei et. al.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

View full text Add to dashboard Cite

The slippage initiation and induced instability of roadway surrounding rock are highly likely to cause dynamic disasters, severely influencing the safety production of mining. With the optical-mechanical monitoring test of the deformation localization of energy dissipation, this study established the optical index of coal deformation equilibrium degree under load, and obtained the evolution law of coal deformation equilibrium degree. After analyzing the relationship between tensile-sliding effect and mechanical behavior of coal deformation field, it proposed the strain energy ratio coefficient. The results indicate that the strength reduction of coal body is affected by the deformation accumulation of loading displacement field. The sliding displacement of the stable sliding type specimen occurs 5.5s earlier than tensile displacement，which is 4.4s longer than the instantaneous instability type specimen. The instability type of coal is closely related to the tangent angle of the strain energy ratio coefficient and the damage persistence characteristics. The damage accumulation of stable equal amplitude contributes to the stable failure, and the damage accumulation of interval equal amplitude influences the instantaneous instability development. The fracture expansion stage is the main stage of energy consumption damage accumulation. That is, the main energy consumption damage accumulation stage of the stable slip coal is the stable crack expansion stage, with the damage proportion of 35.89%, while the damage proportion of instantaneous instability coal in the unsteady crack expansion stage is 84.226%. The study provides theoretical reference for the fracture law and risk monitoring of coal slippage.

show abstract

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Thanks to the acoustic emission (AE) technique in the laboratory, monitoring analyses can be conducted to observe the pre-failure microcrack accumulation [15][16][17][18][19][20][21][22][23][24] as well as to detect damage acceleration in brittle rocks consisting of pre-existing flaws [25][26][27][28][29][30][31]. Propagation and distribution of microcracks with increasing axial stress can be followed in rock samples by measuring the energy released.…”

Section: Introductionmentioning

confidence: 99%

Stress levels of precursory strain localization subsequent to the crack damage threshold in brittle rock

Göğüş

Avşar

2022

PLoS ONE

View full text Add to dashboard Cite

Micromechanical cracking processes in rocks directly control macro mechanical responses under compressive stresses. Understanding these micro-scale observations has paramount importance in predicting macro-field problems encountered in rock engineering. Here, our study aims to investigate the development of precursory damage zones resulting from microcracking pertinent to macro-scale rock failure. A series of laboratory tests and three-dimensional (3D) numerical experiments are conducted on andesite samples to reveal the characteristics of damage zones in the form of strain fields. Our results from discrete element methodology (DEM) predict that the crack damage threshold (σcd) values are 61.50% and 67.44% of relevant peak stress under two different confining stresses (σ3 = 0.1 MPa and σ3 = 2 MPa), respectively. Our work evaluates the strain fields within the range of the σcd to the peak stress through discrete analysis for both confining stresses. We note that the representative strain field zones of failure are not observed as soon as the σcd is reached. Such localized zones develop approximately 88% of peak stress levels although the confinement value changes the precursory strain localization that appears at similar stress levels. Our results also show that the distinct strain field patterns developed prior to failure control the final size of the macro-damage zone as well as their orientation with respect to the loading direction (e.g 17° and 39°) at the post-failure stage. These findings help to account for many important aspects of precursory strain field analysis in rock mechanics where the damage was rarely quantified subtly.

show abstract

“…At present, experimental and numerical studies [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] mainly concentrated on the cracking behaviors, including the initiation, propagation and coalescence of cracks, of flawed rocks under uniaxial compression. These studies emphatically discussed the effects of flaw arrays on the fracture behaviors of different types of flawed rock materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on cracking behaviors of coarse and fine sandstone containing two flaws under biaxial compression

Zhou

Peng

Zhang

et al. 2022

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

In this paper, the effects of materials and confining pressures on the mechanical properties of flawed coarse and fine sandstone is first analyzed. Then, the evolution processes of spatiotemporal acoustic emission (AE) events of coarse and fine sandstone specimens containing two flaws subjected to biaxial compression are investigated to character the damage characteristics and the fracture mechanism. Third, the ultimate failure modes of coarse sandstone specimens are compared with those of the fine sandstone specimens. Finally, the Electron Probe Microscope Analysis (EPEI) technique is conducted to observe the main macrofracture surfaces of coarse and fine sandstone specimens. Besides, the distribution characteristics of two AE indexes are also employed to qualitatively reveal the failure mechanism of tested specimens. The experimental results can provide new insight into the mechanical responses and the cracking behaviors of flawed rocks in complex stress loading conditions.

show abstract

Deformation localization and cracking processes of sandstone containing two flaws of different geometric arrangements

Cited by 16 publications

References 50 publications

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Stress levels of precursory strain localization subsequent to the crack damage threshold in brittle rock

Experimental study on cracking behaviors of coarse and fine sandstone containing two flaws under biaxial compression

Contact Info

Product

Resources

About