Mechanical behavior of single-flawed cylindrical specimens subjected to axial loading: a numerical investigation

Asadizadeh, Mostafa; Khosravi, Saeed; Karimi, Javad; Sherizadeh, Taghi; Vajedian, Sanaz; Hossaini, Mohammad Farouq

doi:10.1007/s10064-022-02940-4

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…The upward extension direction was almost perpendicular to the horizontal direction. (2) When the wing crack extended near the short axis of the elliptical pre-existing crack, spiral cracks appeared and extended downward to the surface of the specimen. (3) When the axial load approached the failure load, secondary cracks appeared and propagated instantaneously to the surface of the specimen.…”

Section: Data Availability Statementmentioning

confidence: 99%

“…For example, Soheil Abharian et al [1] studied the mechanical behavior of gypsum specimens with linearly arranged round holes at different angles and notches of different sizes under uniaxial compression and evaluated the in-teraction and strength effects of these defects during crack development under load. Mostafa Asadizadeh et al [2] performed numerical simulations on cylindrical specimens with cracks under axial load and studied the effects of the inclination, length, and aperture of individual fractures on the mechanical behavior of the rock mass, crack initiation, and propagation. Jinhyun Choo et al [3] studied the influence of size effects on the strength and crack propagation mode of gypsum samples with single and double defects through experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Micro-Evolution Mechanism of 3D Crack Initiation in Brittle Materials with Hole under Uniaxial Compression

Maimaitiyusupu,

Zhu,

Ren

et al. 2024

Materials

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This article investigates the microscopic mechanism of crack initiation and propagation in three-dimensional embedded cracks in brittle materials containing circular holes. First, a method for the development of transparent, brittle materials is proposed. Second, UCS tests were conducted on transparent, brittle materials containing circular holes and internally embedded three-dimensional cracks. Finally, a numerical model was established in PFC3D to analyze the crack initiation and propagation mechanism. The results show that when α = 0° (α refers to the pre-existing crack inclination), the upper tip of the pre-existing crack appears as a tensile wing crack, and the lower tip of the pre-existing crack appears as a tensile–shear mixed crack. When α = 30°, no wing crack appears, and the tensile crack on the fracture surface only appears after the hole cracks. When α = 60 and 90°, a tensile wing crack and an anti-wing tensile–shear mixed crack appear at the upper tip of the pre-existing crack. A tensile wing crack appears at the lower tip of the pre-existing crack and appears “self-limiting”. During the propagation of wing cracks to the surface of the specimen, the transition sequence of the crack propagation mechanism is tensile through failure—tension-shear mixed failure—tensile failure. It can be seen that the interaction between the crack and hole has an important influence on the evolution mechanism of the crack and the failure mode of the specimen.

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Section: Data Availability Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Micro-Evolution Mechanism of 3D Crack Initiation in Brittle Materials with Hole under Uniaxial Compression

Maimaitiyusupu,

Zhu,

Ren

et al. 2024

Materials

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show abstract

“…In certain cases, like Memphis, significant decreases in groundwater levels do not manifest noticeable subsidence, which is potentially attributed to high reservoir density or the presence of rock reservoirs (Poland & Davis, 1969). Studying the mechanical behavior of formations during liquid extraction reveals a nonlinear connection between liquid extraction and regional land subsidence, highlighting the interplay between hydraulic parameters and subsidence and underscoring the importance of numerical modeling in understanding mechanisms affecting land subsidence (Asadizadeh et al, 2022;Motagh et al, 2007;Mousavi et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

A hydromechanical EFG-based Model for Numerical Simulation of Land Subsidence Induced by Groundwater Extraction in Anisotropic Aquifers

Tourei,

Pak,

Iranmanesh

et al. 2024

Preprint

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This study presents a coupled hydromechanical element-free Galerkin (EFG) model to simulate land subsidence induced by groundwater withdrawal. The EFG algorithm was validated with unsaturated hydraulic and hydromechanical benchmark problems, showing satisfactory alignment with finite element method (FEM) and theoretical results. We inves-tigated the effects of groundwater pumping on land subsidence and hydraulic head variation in both isotropic and anisotropic aquifers considering unsaturated effects. Our results indicate a nonlinear correlation between groundwater extraction and both hydraulic head decrease and land subsidence increase. In anisotropic aquifers, initial discrepancies were observed between the EFG and FEM models, although final land subsidence and hydraulic head values were closely aligned. Com-parison results show that EFG's land subsidence and hydraulic head decline trends for anisotropic aquifer exhibit a better agreement with the isotropic model compared with those of the FEM. The parametric study revealed that the elastic modulus and Poisson's ratio significantly affect land subsidence levels. While hydraulic conductivity influences the rate of hydraulic head decline and onset of subsidence, it has a minor effect on steady-state values. These findings emphasize the importance of accurate in-situ measurements of elastic modulus and Poisson's ratio for the precision and reliability of feasibility studies in groundwater extraction projects.

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Tensile behavior of layered rock disks under diametral loading: experimental and numerical investigations

et al. 2023

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Mechanical behavior of single-flawed cylindrical specimens subjected to axial loading: a numerical investigation

Cited by 7 publications

References 36 publications

Analysis of Micro-Evolution Mechanism of 3D Crack Initiation in Brittle Materials with Hole under Uniaxial Compression

Analysis of Micro-Evolution Mechanism of 3D Crack Initiation in Brittle Materials with Hole under Uniaxial Compression

A hydromechanical EFG-based Model for Numerical Simulation of Land Subsidence Induced by Groundwater Extraction in Anisotropic Aquifers

Tensile behavior of layered rock disks under diametral loading: experimental and numerical investigations

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