Abstract
It is extremely important to investigate the mechanical properties and failure characteristics of granite at the mesoscale to understand the mesoscopic evolution mechanism of the time-dependent fracture of deep-buried hard rocks. This study explores the mesoscopic mechanical properties (i.e., hardness, Young’s modulus, and fracture toughness) of the primary granite minerals and their interfaces using nanoindentation. Micro X-ray computed tomography was used to analyze the fracture characteristics of the failed Brazilian disc of granite. Moreover, two homogenization upscaling methods were used to calculate granite’s Young’s modulus and compared with that from uniaxial compression test results. The results demonstrate the following: (1) The mechanical properties of granite minerals are related to the peak load of nanoindentation. Young’s modulus and hardness of quartz, K-feldspar, and plagioclase decrease with an increase in the peak load and tend to be stable when the peak load reaches 5000 μN, whereas Young’s modulus and hardness of biotite at multiple peak loads are in variability and irregularity. (2) Young’s modulus and hardness of quartz–plagioclase and quartz–biotite interfaces are between quartz and plagioclase and quartz and biotite, respectively. Furthermore, a linear formula is proposed to estimate fracture toughness based on Young’s modulus of granite minerals. (3) The generalized means method that predicts granite’s Young’s modulus is more accurate compared to the Mori–Tanaka method. (4) Under Brazilian splitting conditions, ~ 84% of tensile cracks along intragranular cracks primarily occur in feldspar minerals, while ~ 16% along grain boundaries occur at feldspar–biotite interfaces.
Highlights
-
Mesomechanical properties of granite minerals and mineral interfaces.
-
A linear relationship between the fracture toughness and Young’s modulus.
-
Homogenization methods used for upscaling the mesoscopic Young’s modulus of granite.
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Data Availability
Datasets related to this article are available from the corresponding author (dpxu@whrsm.ac.cn).
Abbreviations
- \(A_{{\text{c}}}\) :
-
Contact area of the indenter on the sample surface
- \(A_{\max }\) :
-
Maximum contact area of the indenter on the sample surface
- \(E\) and \(E_{{\text{r}}}\) :
-
Young’s modulus and reduced modulus of the sample
- \(E_{\hom }\) :
-
Homogenization Young’s modulus of granite
- \(E_{{\text{i}}}\) :
-
Young’s modulus of the indenter
- \(E_{{\text{u}}}\) :
-
Young’s modulus of the weakest mineral
- \(E_{{\text{w}}}\) :
-
Uniaxial compressive modulus of granite
- \(f_{{\text{i}}}\) :
-
Volume fraction of minerals
- \(G_{{\text{c}}}\) :
-
Critical energy release rate
- \(G_{\hom }\) :
-
Shear modulus of granite
- \(H\) :
-
Hardness of the sample
- \(h\) :
-
Indentation depth of the sample
- \(h\), \(h_{{\text{c}}}\), \(h_{{\text{f}}}\), and \(h_{{\text{m}}}\) :
-
Indentation depth, contact depth, residual depth, and maximum indentation depth
- \(J\) :
-
Scaling parameter
- \(K_{\hom }\) :
-
Bulk modulus of granite
- \(K_{{{\text{{\rm I}C}}}}\) :
-
Tensile (mode I) fracture toughness
- \(k_{{\text{s}}}\) and \(k_{{{\text{low}}}}\) :
-
Bulk moduli of the biotite and biotite porous matrix
- \(l\) :
-
Crack length
- \(M\) :
-
Specific mechanical property
- \(P\) :
-
Applied loading force of the indenter
- \(P_{\max }\) :
-
Peak force of the indenter
- \(S\) :
-
Contact stiffness of the sample
- \(U_{{{\text{crack}}}}\), \(U_{{{\text{pp}}}}\), \(U_{{{\text{ir}}}}\), \(U_{{\text{t}}}\), and \(U_{{\text{e}}}\) :
-
Fracture energy, pure plasticity energy, irreversible energy, total energy, and recoverable elastic energy
- \(V\) :
-
Volume fraction of the weakest mineral
- \(\alpha\) and \(\beta\) :
-
Power law fitting constants
- \(\gamma_{{\text{p}}}\) :
-
Plastic energy
- \(\omega\) :
-
Porosity of the biotite pore matrix
- \(\varepsilon\) :
-
A constant that depends on the indenter tip
- \(\mu_{{\text{s}}}\) and \(\mu_{{{\text{low}}}}\) :
-
Shear moduli of the biotite and biotite porous matrix
- \(\nu\) and \(\nu_{{\text{i}}}\) :
-
Poisson’s ratios of the sample and indenter
- \(\sigma_{{\text{f}}}\) :
-
Critical fracture stress
- \(E_{{\text{m}}}\), \(c\) and \(\varphi\) :
-
Young’s modulus, cohesion, and internal friction angle of minerals and mineral interfaces
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Acknowledgements
This research was funded by National Natural Science Foundation of China under Grant Nos. 51979268, 52279117, and 41877256.
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Liu, Xy., Xu, Dp., Li, Sj. et al. An Insight into the Mechanical and Fracture Characterization of Minerals and Mineral Interfaces in Granite Using Nanoindentation and Micro X-Ray Computed Tomography. Rock Mech Rock Eng 56, 3359–3375 (2023). https://doi.org/10.1007/s00603-023-03221-6
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DOI: https://doi.org/10.1007/s00603-023-03221-6