Abstract
The excavation of deep underground engineering causes a sophisticated three-dimensional stress redistribution in the surrounding rock, leading to the damage and rupture of the surrounding rock. It is difficult to reveal the fracture mechanism of rocks under complex stress loading path changes through conventional uniaxial or triaxial stress tests. In this study, a marble dual-scale 3DEC-GBM (grain-based modeling) discrete element model was established. The model was according to the practical mineral component of marble and its particle size distribution characteristics. Through laboratory true triaxial tests and numerical simulations, investigations were conducted on the deformation and strength characteristics of marble under true triaxial stress states. The evolution process and characteristics of anisotropic fracture and its microscopic tensile and shear fracture mechanism were also thoroughly investigated. Subsequently, the effects of intermediate principal stress σ2 and minimum principal stress σ3 on the intergranular and transgranular failures of marble as well as cracked anisotropy were analyzed, and the tensile–shear failure mechanism and crack anisotropy evolution law of the marble fracture evolution were determined under different true triaxial stress conditions. Finally, the effects of mineral crystal micromechanical parameters on the mechanical characteristics of marble under true triaxial conditions were examined.
Highlights
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Macro-meso failure mechanisms of anisotropic deformation and failure of marble induced by true triaxial stresses were revealed through tests and simulations.
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Pre- and post-peak microcrack anisotropic propagation processes and tensile‒shear mechanisms of marble under true triaxial stresses (σ2, σ3) were investigated.
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Effects of 3DEC-GBM model meso parameters on mechanical behavior of rock were explored.
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Data Availability
The authors confirm they have included a data availability statement in their main manuscript file. The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- 3D:
-
Three-dimension
- 3DEC:
-
Three-dimensional distinct Element
- PFC3D:
-
Three-dimensional particle flow
- GBM:
-
Grain-based model
- SEM:
-
Scanning electron microscopy
- σ 1, σ 2 and σ 3 :
-
Maximum, intermediate and minimum principal stresses, respectively
- σ c, σ r :
-
Peak strength, residual strength, respectively
- ε 1, ε 2 and ε 3 :
-
Maximum, intermediate and minimum principal strains, respectively
- ε c :
-
Peak strain
- UCS:
-
Uniaxial compressive strength
- Ρ, E, υ :
-
Density, Young’s modulus, Poisson’s ratio, respectively
- c, φ :
-
Friction angle, cohesion, respectively
- c r, φ r :
-
Residual friction angle, residual cohesion, respectively
- K, G:
-
Shear modulus, bulk modulus, respectively
- ∆Z min :
-
Normal minimum length of deformation element
- σ ij, Δσ ij :
-
Stress of tetrahedral grains, stress increment of tetrahedral grains, respectively
- Δε ij, δ ij :
-
Strain increment of tetrahedral grains, Kroenecker increment, respectively
- α 2 :
-
Material constants related to bulk modulus and shear modulus
- F n, F s :
-
Contact normal force, contact tangential force, respectively
- ∆ U n, ∆ U s :
-
Contact normal displacement increment, contact tangential force displacement increment, respectively
- T max, F s m ax :
-
Contact maximum tensile force, contact maximum shear force, respectively
- Fs r:
-
Residual shear strength
- A c :
-
Contact area
- τ oct, σ m ,2 :
-
Octahedral shear stress, octahedral effective intermediate stress, respectively
- a, b :
-
Material parameters
- ρ, e, μ :
-
Density, young’s modulus, poisson’s ratio, respectively
- jk n, jk s :
-
Normal stiffness, shear stiffness, respectively
- jf, j c, jt :
-
Friction angle, cohesion, tensile strength, respectively
- jf r, jc r, jt r :
-
Residual friction angle, residual cohesion, residual tensile strength, respectively
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Acknowledgements
The authors acknowledge the financial support received from the National Natural Science Foundation of China (Grant No. 52109119), the Guangxi Natural Science Foundation (Grant No. 2021GXNSFBA075030), and the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research) (Grant No.IWHR-SKL-202202), the Guangxi Science and Technology Project (Grant No. GuikeAD20325002), and the China Postdoctoral Science Foundation Project (Grant No. 2022M723408). The authors sincerely thank Professor **a-Ting Feng and his teams for their help in the experiment.
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ZZ: conceptualization, experiment, methodology, writing, software; SL: data analysis, writing—editing and review; ZQ: investigation, writing-original draft, visualization; QZ: data analysis, software, writing—editing and review, supervision.
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Zheng, Z., Li, S., Qin, Z. et al. Dual-scale 3DEC-GBM Discrete Element Simulation On Mechanical Behavior and Anisotropic Fracture Evolution Mechanism of Rock Induced by True Three-dimensional Stress. Rock Mech Rock Eng 57, 3885–3915 (2024). https://doi.org/10.1007/s00603-023-03754-w
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DOI: https://doi.org/10.1007/s00603-023-03754-w