Abstract
Exploring the mechanical properties and crack characteristics of granite at the grain scale is of greatly significant to understand brittle failures, such as spalling, slabbing, and rockburst of deep-buried hard rock under high geostress. The macroscopic engineering failure of a rock mass is often closely related to the microscopic mechanical properties and microstructure of the constituent minerals. This study derived the microscopic mechanical properties of granite minerals, including Young’s modulus, hardness, fracture toughness, and stiffness ratio based on nanoindentation tests. The relationship of the micromechanical parameters including Young’s modulus, hardness, and fracture toughness is presented in the following order: quartz > K-feldspar > plagioclase > biotite. A parameter calibration process that combines nanoindentation test and trial-and-error method was then proposed to reduce the randomness in the calibration process. This calibration process was adopted to the discrete element method simulation of granite, in which the microstructure of granite is specifically defined through a Voronoi tessellation. Finally, the microcrack evolution and crack characteristics of different minerals in granite were discussed based on the micro-X-ray computed tomography, scanning electron microscopy, and numerical results. The results reveal that the intragranular cracks play a crucial role in the failure process of brittle rocks and largely dominate the macroscopic properties of materials, in which the percentage of intragranular cracks increases from 61% to more than 80% when the compression test changes to the tension test.
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Abbreviations
- \(a\) :
-
Half-length of the precrack in the CSTBD specimen
- \(A_{{\text{c}}}\) :
-
Contact area of the indenter on the sample
- \(A_{\max }\) :
-
Maximum contact area of the indenter on the sample
- \(B\) :
-
Thickness of the CSTBD specimen
- \(d(p_{{\text{i}}} ,p_{{\text{j}}} )\) :
-
Euclidean distance
- \(E\) :
-
Young’s modulus
- \(E_{{\text{r}}}\) :
-
Reduced modulus
- \(E^{*}\) :
-
Linear elastic modulus
- \(\overline{E}^{*}\) :
-
Bond effective modulus
- \(E_{{\text{i}}}\) :
-
Young’s modulus of the indenter
- \(f_{{\text{I}}}\) :
-
Mode I normalized stress intensity factor
- \(F_{\max }\) :
-
Maximum tensile force
- \(G_{{\text{c}}}\) :
-
Critical energy release rate
- \(G\) :
-
Shear modulus
- \(h\) :
-
Indentation depth
- \(h_{{\text{c}}}\) :
-
Indentation contact depth
- \(h_{{\text{f}}}\) :
-
Residual indentation depth
- \(h_{{\text{m}}}\) :
-
Maximum indentation depth
- \(H\) :
-
Hardness
- \(K\) :
-
Bulk modulus
- \(K_{{{\text{{\rm I}C}}}}\) :
-
Tensile (mode I) fracture toughness
- \(k_{{\text{n}}}\) :
-
Normal stiffness
- \(k_{{\text{s}}}\) :
-
Shear stiffness
- \(k_{{{\text{ratio}}}}\) :
-
Normal-to-shear stiffness ratio
- \(\overline{k}_{{\text{n}}} /\overline{k}_{{\text{s}}}\) :
-
Bond normal-to-shear stiffness ratio
- \(P\) :
-
Applied loading force of the indenter
- \(P_{\max }\) :
-
Peak force of the indenter
- \(R\) :
-
Radius of the CSTBD specimen
- \(R_{\min }\) :
-
Minimum radius of the particle
- \(R_{\max } /R_{\min }\) :
-
Maximum-to-minimum radius ratio
- \(S\) :
-
Contact stiffness of the sample
- \(t\) :
-
Thickness of the contact interface
- \(U_{{{\text{crack}}}}\) :
-
Fracture energy
- \(U_{{\text{e}}}\) :
-
Recoverable elastic energy
- \(U_{{{\text{pp}}}}\) :
-
Pure plasticity energy
- \(U_{{\text{t}}}\) :
-
Total energy
- \(\nu\) :
-
Poisson’s ratio of the sample
- \(\nu_{{\text{i}}}\) :
-
Poisson’s ratios of the indenter
- \(\overline{c}\) :
-
Cohesion strength
- \(\overline{\phi }\) :
-
Friction angle
- \(\overline{\lambda }\) :
-
Radius multiplier
- \(\sigma_{c}\) :
-
Uniaxial compressive strength
- \(\sigma_{t}\) :
-
Brazilian tensile strength
- \(\overline{\sigma }_{{\text{c}}}\) :
-
Tensile strength
- \(\sigma_{c} /\sigma_{{\text{t}}}\) :
-
UCS-to-BTS ratio
- \(\varepsilon_{{\text{p}}}\) :
-
Peak strain
- \(\rho\) :
-
Density
- \(\mu\) :
-
Friction coefficient
- \({\mathbb{R}}^{2}\) :
-
Two-dimensional Euclidean plane
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Acknowledgements
This research as supported by the National Natural Science Foundation of China under Grant Nos. 51979268, 52279117, and 52279114.
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Liu, Xy., Xu, Dp., Duan, Sq. et al. Study on the micromechanical and crack characteristics of granite based on nanoindentation test and discrete element method. Comp. Part. Mech. (2023). https://doi.org/10.1007/s40571-023-00664-0
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DOI: https://doi.org/10.1007/s40571-023-00664-0