Abbreviations
- σ cc :
-
Crack closure stress
- σ ci :
-
Crack initiation stress
- σ cd :
-
Crack damage stress
- σ f :
-
Peak strength
- \(\varepsilon_{\text{v}}\) :
-
Volumetric strain
- \(\varepsilon_{\text{ve}}\) :
-
Elastic volumetric strain
- \(\varepsilon_{\text{vc}}\) :
-
Crack volumetric strain
- ΔV :
-
Change of specimen volume
- ΔV elastic :
-
Change of elastic volume
- \(\varepsilon_{\text{axial}}\) :
-
Axial strain
- \(\varepsilon_{\text{lateral}}\) :
-
Lateral strain
- E :
-
Elastic modulus
- ν :
-
Poisson’s ratio
- P wave:
-
Pressure wave
- \(\sigma_{1}\) :
-
Maximum loading stress
- \(\sigma_{3}\) :
-
Minimum loading stress
- AE:
-
Acoustic emission
- CVS:
-
Crack volumetric strain method
- LSR:
-
Lateral strain response method
- MPR:
-
Moving point regression method
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Acknowledgements
The support provided by the National Natural Science Foundation of China (Grant nos. 51978541, 41941018, 51839009) is gratefully acknowledged. Many thanks are given to Mr. Chongyang Liu for assisting with the uniaxial compression tests.
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Zhang, XP., Lv, GG., Liu, QS. et al. Identifying Accurate Crack Initiation and Propagation Thresholds in Siliceous Siltstone and Limestone. Rock Mech Rock Eng 54, 973–980 (2021). https://doi.org/10.1007/s00603-020-02277-y
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DOI: https://doi.org/10.1007/s00603-020-02277-y