Effect of the Confining Pressure on the Dynamic Compression Properties of Transversely Isotropic Rocks

Ou, Xuefeng; Zhang, Xuemin; Feng, Han; Zhang, Cong; Yang, Junsheng

doi:10.1155/2019/5239374

Cited by 10 publications

(10 citation statements)

References 37 publications

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“…However, higher confining stresses can inhibit spalling or shedding when the cracks reach the edges, so the rock specimen will retain its original shape and gain more strength to form relatively complex fracture patterns with crushing cracks at the edges. It is notable that only a very small number of inherited cracks will initiate and propagate during fracturing, which is also supported by the observations in past experiments 42 , 43 . However, due to mathematical constraints, our model cannot present the genuine state of real rock failure and may produce some undesirable results.…”

Section: Numerical Simulation and Analysissupporting

confidence: 83%

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Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Deng

et al. 2022

Sci Rep

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The crack propagation behavior of rock during compression involves complex mechanisms. Describing the growth behavior of a large number of cracks with conventional mechanical models is a major challenge. Therefore, in this work, we propose a new method to describe crack growth behavior by considering crack bodies as free voxels that can expand and coalesce within a rock sample according to certain rules. Specifically, we first propose a crack growth model that quantitatively describes the crack growth ratio and crack growth rate, which are integrally related to the loading rate, internal friction angle, cohesion, initial porosity, and confining stress. Second, to avoid the complex analytical process of the traditional mechanical model in solving the propagation directions of multiple cracks, we introduce a method for determining the crack growth directions of shearing failure based on the colony growth assumption. This method defines the crack propagation direction as a synthetic vector of the inertial direction, the attractive direction, the Coulomb direction, and the edge direction. Moreover, a new mathematical description method of fracture energy and plastic energy is proposed to calculate the crack growth at each time step. The simulation results show that our crack growth model for shearing failure agrees well with the experimental results and explains the fracture behavior and transformation law of cracks to some extent.

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Section: Numerical Simulation and Analysissupporting

confidence: 83%

“…This phenomenon is aligned with the findings in Refs. 42 , 43 . The growth rate in our model represents the probability that those fractured voxels can propagate when the initial fracture stress exceeds the cohesion.…”

Section: Numerical Simulation and Analysismentioning

confidence: 99%

Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Deng

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…All the bars are made of 40 Cr alloy steel, with a Young's modulus of 240 GPa, a P-wave velocity of 5400 m/s, and a density of 7810 kg/m 3 . A cone-shaped striker is used to generate a half-sine incident wave and provide constant strain rate loading until sample failure [18][19][20][21]. A Photron Fastcam SA1.1 high-speed camera is utilized to monitor the whole failure process of the samples.…”

Section: Static and Dynamic Testing Facilitiesmentioning

confidence: 99%

Static and Dynamic Brazilian Tests on Layered Slate considering the Bedding Directivity

Zhang

Feng

et al. 2020

Advances in Civil Engineering

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A layered rock usually exhibits strong anisotropy due to its layered structure. In order to study the anisotropic effect on its static and dynamic tensile properties, a medium strength anisotropy slate is chosen and tested in five groups of bedding plane dip angles. The dynamic tests were carried out by a split Hopkinson pressure bar (SHPB), and the failure process of rock samples is recorded by a high-speed camera. The failure mode and strength characteristic of the slate are analyzed. The static test results show that layered structure significantly affects the failure mode, and the influence of the bedding plane depends on the degree of anisotropy. The static and dynamic “tensile strength” exhibit the “U” type strength anisotropy. For samples in the same dip angle group, the “tensile strength” shows clear dynamic strengthening effect, and the growth rate is most significant at θ = 45°.

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“…Tere are many literature works about the dynamic displacement and stress responses of isotropic media [4][5][6][7][8][9]. However, the assumption of isotropy cannot refect the anisotropic properties of layered media in the horizontal and vertical directions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Crossanisotropic Layered Media with Imperfect Interface under Axisymmetric Loads

Han

Guo

Yang

et al. 2022

Advances in Civil Engineering

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Considering the incomplete contact between the adjacent layers of crossanisotropic multilayered half-space media, an algorithm was derived based on the spectral element method (SEM) to determine the dynamic response at any point of the medium when an axisymmetric harmonic load is applied. The algorithm used two equivalent contact parameters to simulate the relationship between the discontinuity of the displacement and stress. The SEM was employed for the summation in the integral calculation to avoid the infinite integral in the integral transformation and greatly improve the efficiency of the solution to the dynamic response of the crossanisotropic layered half-space medium. The accuracy of the developed method is verified by the numerical examples as well as the efficiency of the developed method. Finally, an extensive parametric analysis of the contact parameters of the interface between the layers of the layered medium, namely, the point of the application of the external load, the excitation frequency, and the heterogeneous properties of the layered medium was conducted, providing a reliable numerical basis for engineering practice.

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Effect of the Confining Pressure on the Dynamic Compression Properties of Transversely Isotropic Rocks

Cited by 10 publications

References 37 publications

Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Static and Dynamic Brazilian Tests on Layered Slate considering the Bedding Directivity

Dynamic Response of Crossanisotropic Layered Media with Imperfect Interface under Axisymmetric Loads

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