An experimental study on the brittle failure under true triaxial conditions

Cheon, Dae‐Sung; Jeon, Seokwon; Park, C.; Ryu, Chang-Ha

doi:10.1016/j.tust.2005.12.087

Cited by 31 publications

(4 citation statements)

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“…There are a large number of methods to measure the strength of rocks, such as nondestructive acoustic emission technology [6][7][8] at the microscopic scale and true triaxial systems [9] and dynamic loading systems [10] at the macroscopic scale. In this experiment, the dynamic mechanical properties of rock are studied by the split Hopkinson pressure bar (SHPB) system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties and Failure Characteristics of Sandstone with Pre-Flaws Parallel to the Loading Direction

Zhu

Song

et al. 2023

Sustainability

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Investigations on rock dynamics have been comprehensively focused on when the dynamic impact is perpendicular to the trend of the flaws, while understanding the dynamic mechanical properties and failure characteristics of rock with pre-flaws parallel to the loading direction remains unrevealed. In this study, impact tests are performed to experimentally study the dynamic mechanical properties, failure characteristics, and energy evolution of pre-flawed sandstone using the split Hopkinson pressure bar (SHPB) apparatus, in which the pre-flaws are parallel to the loading direction. The results show that for specimens, the dynamic loading rate and the number of flaws greatly influence the dynamic strength, peak strain, energy absorption rate, and failure behaviors. The dynamic strength increases exponentially with an increase in loading rate and decreases with an increase in flaw numbers. The fractal dimension of triple-flawed specimens is the largest at the same loading rate range. The failure modes of different pre-flawed specimens show a transition from tensile failure to tensile-shear failure with the increase of dynamic loading rate.

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Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties and Failure Characteristics of Sandstone with Pre-Flaws Parallel to the Loading Direction

Zhu

Song

et al. 2023

Sustainability

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“…Under lower confining pressure and with a rising axial load, all three types of fractures may eventually appear. The sidewall fractures may be the only tensile fractures that initiate from the hole sidewall as the confining pressure increases or the hole size falls [21][22][23][24][25][26]. With its origin in a region of high stress gradients and pure compression, the sidewall fracture tops all three types of the fractures in complexity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of high-performance concrete with a hole under triaxial compression

Zhang,

Wang

2023

Preprint

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Holes are often reserved in concrete for holding cables and other industrial facilities. In order to ensure the safe application of high-performance concrete (HPC) members in a state of three-dimensional compression, it is of great significance to research the effect of holes on the mechanical properties of HPC under triaxial compression. However, there have been no previous studies on the triaxial compressive mechanical properties of HPC with holes. In this paper, HPC with a hole are experimentally studied under triaxial compression. The stress-strain curves, the strength, and the failure mechanisms of HPC are obtained. The experiment results show that both the confining pressure and the hole size jointly influence on the mechanical properties of HPC. Moreover, the Power-law failure criterion is modified to eludidate the relationship between the triaxial compressive strength of HPC and the hole size. In addition, the stress averaging method is firstly introduced to predict the sidewall failure of the hole in concrete, and the experimental results are used to modify the stress averaging method. The results show that the modified method can accurately predict the sidewall failure of the hole, and both the decrease of the confining pressure and the increase of the hole size are conducive to failure of the hole. This study makes up for the blank of the research of HPC with holes under triaxial compression, and presents an effective method to predict the failure of the hole.

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“…When the elastic strain energy is released suddenly in the free face, the rock will produce violent brittle failure in a short time, causing serious dynamic disasters [13][14][15]. Rock mass with rockburst proneness is usually elastic-perfectly brittle rock mass with few cracks or only hidden cracks [4,16,17]. In practice, most underground projects are built in a rock mass with structural planes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Joint Density on Rockburst Proneness of the Elastic‐Brittle‐Plastic Rock Mass

Pan

Ren

Cai

2021

Shock and Vibration

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The prediction of rockburst proneness is the basis of preventing and controlling rockburst disasters in rock engineering. Based on energy theory and damage mechanics, the quantitative functional relationship between joint density and energy density was derived. Then, the theoretical results were verified by numerical simulation and uniaxial compression test, and the effect of joint density on rockburst proneness of the elastic-brittle-plastic rock mass was discussed. The results show that the relationship between the joint density and the dissipated energy index of the jointed rock mass is a logarithmic function. With the same total input energy, the higher the joint density, the more the damage dissipation energy. Even in the case of high joint density, the rock mass still has limited resistance to external failure. Under the same joint density, the strength of parallel jointed rock mass is better than that of the cross-jointed rock mass, and the parallel jointed rock mass can accumulate more elastic strain energy and has higher rockburst proneness. The joint density is closely related to the ability of the rock mass to store high strain energy. The higher the joint density is, the weaker the ability to accumulate the elastic strain energy of rock mass is and the lower the rockburst proneness is. It is helpful to predict rockburst proneness by investigating and studying the properties of geological discontinuities. The research results have some theoretical and engineering guiding significance for the prediction of rockburst proneness of the jointed rock mass.

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An experimental study on the brittle failure under true triaxial conditions

Cited by 31 publications

References 0 publications

Dynamic Mechanical Properties and Failure Characteristics of Sandstone with Pre-Flaws Parallel to the Loading Direction

Dynamic Mechanical Properties and Failure Characteristics of Sandstone with Pre-Flaws Parallel to the Loading Direction

Mechanical properties of high-performance concrete with a hole under triaxial compression

Effect of Joint Density on Rockburst Proneness of the Elastic‐Brittle‐Plastic Rock Mass

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