Abstract
This paper studies the dynamic mechanical characteristics of siliceous sandstone (SS) after elevated temperature treatment and discusses the damage mechanism of structure thermal stress on rock. Firstly, the dynamic compression tests of SS under room temperature (25 °C) and different high temperatures (200, 400, 600, and 800 °C) were carried out using the split Hopkinson pressure bar (SHPB). The rock dynamic curves of stress-strain were obtained, and the variation of the strength, peak strain, and dynamic elastic modulus with strain rate and temperature were discussed. Secondly, the scanning electron microscope (SEM) technique was adopted to determine the change of the rock micro-structure as temperature increases, and the mechanism of thermal damage was analyzed. The results show that the SS is sensitive to temperature, and 200 °C and 600 °C are distinct turning points of mechanical properties. At room temperature to 200 °C, the strength increases slightly, decreases from 200 to 600 °C, and then decreases rapidly; the peak strain decreases first and then increases; the strain rate effect of the dynamic elastic modulus of rock at different temperatures is not obvious, indicating that the rock dynamic elastic modulus is a material property, independent of loading rate. The SEM photographs of rock surface after high temperature show that the internal structure of rock affected by temperature is obvious. Significant changes appear at 400 °C, inconsistent with the inflection point of mechanical properties.
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Abbreviations
- STS:
-
Structural thermal stress
- SFT:
-
Static fracture toughness
- SHPB:
-
Split Hopkinson pressure bar
- CT:
-
Computed tomography
- DFT:
-
Dynamic fracture toughness
- SEM:
-
Scanning electron microscope
- SS:
-
Siliceous sandstone
- ISRM:
-
International Society for Rock Mechanics
- P-wave:
-
Longitudinal wave
- XRD:
-
X-ray diffraction
- TG:
-
Trans-granular
- IG:
-
Inter-granular
- A b :
-
Area of the bars cross-section (mm2)
- E b :
-
Young’s modulus of the bars (GPa)
- C b :
-
P-wave velocity of the bars (m/s)
- ρ b :
-
Density of the bars (kg/m3)
- A s :
-
Area of the sample cross-section (mm2)
- l s :
-
Length of the sample (mm)
- D s :
-
Diameter of the specimen (mm)
- ε in :
-
Incident pulse strain
- ε re :
-
Reflected pulse strain
- ε tr :
-
Transmitted pulse strain
- σ T :
-
Thermal stress (MPa)
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Acknowledgments
The authors thank the anonymous reviewers for their comments and suggestions, especially for providing us with new research ideas for the following studies.
Funding
The authors received financial supports from the following agents: the National Key Research and Development Program of China (2016YFC0600903); the National Natural Science Foundation of China (51774287); the Fundamental Research Funds for the Central Universities (No. 2017QL05).
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Yang, R., Fang, S., Li, W. et al. Temperature effects on dynamic compressive behavior of siliceous sandstone. Arab J Geosci 13, 382 (2020). https://doi.org/10.1007/s12517-020-05370-2
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DOI: https://doi.org/10.1007/s12517-020-05370-2