Abstract
Internal fissures in rocks are an important factor that complicate the mechanical response of rock under external loading. With the development of numerous geotechnical projects involving dynamics, research on the dynamic response characteristics of fissured rock under dynamic loading has been a trending issue in recent years. The purpose of this paper is to summarize the research of numerical and experimental methods on the influence of dynamic loading on the properties of fissured rock samples. From the perspective of rock dynamics, damage mechanics, and fracture mechanics, the influence of fissure characteristics on the mechanical properties and failure modes of rock under dynamic loading are further analyzed. By analyzing the fracture propagation mechanism of different fissured rock samples under dynamic loading, the relationship between the strength and failure characteristics of different fissured rock samples is explored. This investigation is of great significance to further study the mechanical characteristics and failure law of complex fissured rock under dynamic loadings.
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Abbreviations
- Ф × h :
-
Diameter and height of rock sample (mm)
- l × w × t :
-
Length, width, and thickness of rock sample (mm)
- 2a × d :
-
Length and width of fissure (mm)
- s :
-
Shape of fissure (F = fissure, H = hole)
- n :
-
Number of fissures
- α :
-
Inclination angle of fissure (°)
- α min :
-
Minimum inclination angle of fissure (°)
- α t :
-
Threshold inclination angle of fissure (°)
- β :
-
Inclination angle of rock bridge (°)
- N D :
-
Normalized strength index
- N D-min :
-
Minimum normalized strength index
- σ c - α :
-
Compressive strength of rock sample with fissure of angle α (MPa)
- σ c -min :
-
Compressive strength of rock sample with fissure of minimum angle αmin (MPa)
- \(\dot{\varepsilon }\) :
-
Strain rate (s−1)
- f :
-
Frequency (Hz)
- p :
-
Pressure (MPa)
- p r :
-
Penetration rate
- v :
-
Impact rate (m/s)
- m :
-
Drop hammer mass (kg)
- Ft1 :
-
Tensile fracture I
- Ft2 :
-
Tensile fracture II
- Fs :
-
Shear fracture
- Fm :
-
Mixed fracture (including Fts and Fst)
- Fts :
-
Tensile-shear fracture/mixed mode fracture mainly composed of tensile fracture
- Fst :
-
Shear-tensile fracture/mixed mode fracture mainly composed of shear fracture
- SHPB:
-
Split Hopkinson pressure bar test
- DWT:
-
Drop-weight test
- DHS:
-
Dynamic hydraulic servo test
- PMMA:
-
Polymethyl methacrylate
- RFPA:
-
Rock failure process analysis method
- DDA:
-
Discontinuous deformation analysis method
- PFC:
-
Particle flow code
- FDEM:
-
Finite-element/discrete-element coupling analysis methods
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Acknowledgements
This research was supported by the National Key Research and Development Program of China (Grant No. 2019YFC1509700). We also want to thank the technicians who helped and the anonymous reviewers for their constructive comments.
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The work of Zhenming Shi was supported by the National Key Research and Development Program of China, under Grant 2019YFC1509700.
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Zhao, F., Shi, Z. & Yu, S. Fracture mechanics behaviors of fissured rock under dynamic loading: a review. Environ Earth Sci 81, 526 (2022). https://doi.org/10.1007/s12665-022-10582-8
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DOI: https://doi.org/10.1007/s12665-022-10582-8