Laboratory test and numerical simulations for 3D printed irregular columnar jointed rock masses under biaxial compression

Zhao, Ding Guo; Xia, Yingjie; Zhang, Chuanqing; Zhou, Hui; Tang, Chun’an; Liu, Ning; Chen, Jun; Wang, Peng; Wang, Chenglong

doi:10.1007/s10064-022-02626-x

Cited by 10 publications

(3 citation statements)

References 56 publications

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“…In order to study the dynamic mechanical characteristics and failure modes of irregular CJRM samples under different dynamic loading conditions, four numerical models of rock mass with 0 • , 30 • , 60 • and 90 • in dip angle were established. According to the reconstruction of CJRMs and the establishment of numerical models [62,69,70], parameters of the numerical model are validated by the static loading experimental results first, and the dynamic mechanical characteristics and failure modes of the CJRM samples under different dynamic loading schemes are studied.…”

Section: Numerical Modeling and Parameter Calibrationmentioning

confidence: 99%

“…According to the model-building method proposed by Xia et al [71,72] and Zhao et al [69], the digital models of irregular CJRMs with four different dip angles were established using a certain number of slices. The corresponding numerical models of CRJMs were built in numerical software, as shown in Figure 3a.…”

Section: Establishment Of the Numerical Simulation Modelmentioning

confidence: 99%

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Numerical Simulation of Failure Modes in Irregular Columnar Jointed Rock Masses under Dynamic Loading

Xia,

Liu,

et al. 2023

Mathematics

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The mechanical properties and failure characteristics of columnar jointed rock mass (CJRM) are significantly influenced by its irregular structure. Current research on CJRMs is mainly under static loading, which cannot meet the actual needs of engineering. This paper adopts the finite element method (FEM) to carry out numerical simulation tests on irregular CJRMs with different dip angles under different dynamic stress wave loadings. The dynamic failure modes of irregular CJRMs and the influence law of related stress wave parameters are obtained. The results show that when the column dip angle α is 0°, the tensile-compressive-shear failure occurs in the CJRMs; when α is 30°, the CJRMs undergo tensile failure and a small amount of compressive shear failure, and an obvious crack-free area appears in the middle of the rock mass; when α is 60°, tensile failure is dominant and compressive shear failure is minimal and no crack area disappears; and when α is 90°, the rock mass undergoes complete tensile failure. In addition, in terms of the change law of stress wave parameters, the increase in peak amplitude will increase the number of cracks, promote the development of cracks, and increase the proportion of compression-shear failure units for low-angle rock mass. The changes in the loading and decay rate only affect the degree of crack development in the CJRMs, but do not increase the number of cracks. Meanwhile, the simulation results show that the crack expansion velocity of the CJRMs increases with the increase in dip angle, and the CJRMs with dip angle α = 60° are the most vulnerable to failure. The influence of the loading and decay rate on the rock mass failure is different with the change in dip angle. The results of the study provide references for related rock engineering.

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Section: Numerical Modeling and Parameter Calibrationmentioning

confidence: 99%

Section: Establishment Of the Numerical Simulation Modelmentioning

confidence: 99%

Numerical Simulation of Failure Modes in Irregular Columnar Jointed Rock Masses under Dynamic Loading

Xia,

Liu,

et al. 2023

Mathematics

Self Cite

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“…Bai et al [20] sought to investigate the progressive failure characteristics and mechanisms of different kinds of sandwiched coal-rock specimens. Zhao and Xia et al [21][22][23] investigated the mechanical behavior and damage characteristics of 3D-printed irregular columnar jointed rock masses under uniaxial, biaxial, and true triaxial actions.…”

Section: Introductionmentioning

confidence: 99%

Patterns of Influence of Parallel Rock Fractures on the Mechanical Properties of the Rock–Coal Combined Body

Liu²,

Qian³

2022

Sustainability

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Hydraulic fracturing of a roof can attenuate the strong mineral pressure and stress transfer by creating a series of parallel artificial fractures in it, and different forms of hydraulic parallel fractures have different effects on the attenuation effect of the coal rock system. In this regard, this study investigated the influence law of different forms of parallel pre-cracks on the mechanical properties of a rock–coal combined body through PFC2D numerical simulation, and the following conclusions were obtained. Parallel pre-cracks significantly affected the mechanical properties of the rock–coal combined body. The stress–strain curve of the coal–rock assemblage containing Parallel pre-cracks changes significantly following reductions in peak strength, peak strain, elastic modulus, and crack initiation stress. The closer the angle θ between the single set of parallel pre-cracks and the horizontal is to 30°, the longer the length, L, and the lower the peak strength of the specimen, the peak strain, the modulus of elasticity, and the crack initiation stress. Macroscopic damage patterns are given for a rock–coal combined body containing single sets of parallel pre-cracks of different parameters, with coal sample damage, coal–rock sample damage and rock sample damage; a rock–coal combined body containing parallel pre-cracks is divided into three modes of fracture initiation when pressurized. These are the cracking of the coal sample, the simultaneous cracking of the parallel pre-crack tips in coal and rock samples, and the cracking of the parallel pre-crack tips in rock samples.

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A New Method to Investigate the Size Effect and Anisotropy of Mechanical Properties of Columnar Jointed Rock Mass

et al. 2022

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Laboratory test and numerical simulations for 3D printed irregular columnar jointed rock masses under biaxial compression

Cited by 10 publications

References 56 publications

Numerical Simulation of Failure Modes in Irregular Columnar Jointed Rock Masses under Dynamic Loading

Numerical Simulation of Failure Modes in Irregular Columnar Jointed Rock Masses under Dynamic Loading

Patterns of Influence of Parallel Rock Fractures on the Mechanical Properties of the Rock–Coal Combined Body

A New Method to Investigate the Size Effect and Anisotropy of Mechanical Properties of Columnar Jointed Rock Mass

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