Abstract
To explore the influence of cyclic impact and axial static pressure on the damage of chemically corroded sandstone, a series of cyclic impact tests were conducted on white sandstone by using the Split Hopkinson Pressure Bar. Besides, the longitudinal sections and fractures of samples were observed with the scanning electron microscope for the purpose of investigating the damage characteristics and structural changes of sandstone subjected to the coupling of force and chemistry. The results show: (1) When pH of the solution is 7, the number of cyclic impacts and stress peaks of specimens increases, and the specimens respond with a significantly high resistant strength. (2) The stress wave transmission coefficient of sandstone decreases gradually with the increase of the number of cyclic impacts, while the reflection coefficient shows a tendency of "decreasing firstly and then increasing". (3) Cylindrical specimens with a certain axial static pressure present an "X" shaped conjugate failure under cyclic impact. When axial static pressure is too large or there is excessive impact, the "X" shaped conjugate undergoes shear to a state of broken cones. (4) The vertical section and fracture surface damage degree of white sandstone soaked in the sodium sulfate solution is more serious than that in the sodium sulfate solution.
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Abbreviations
- SHPB:
-
Split Hopkinson Pressure Bar
- SEM:
-
Scanning electron microscope
- DIC:
-
Digital image correlation
- ISRM:
-
International Society for Rock Mechanics
- UCS:
-
Uniaxial compressive strength
- pH:
-
Hydrogen ion concentration index of chemical solution
- σ as :
-
Axial static stress
- σ fd :
-
First impact stress peak
- σ md :
-
Maximum stress peak of cyclic impact
- σ cs :
-
Combined static–dynamic strength
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The authors are very grateful to editors and reviewers for carefully reading the manuscript and providing valuable suggestions.
Funding
The authors are grateful for financial support from the National Natural Science Foundation of China (No. 51664016, No. 51664017) and Postgraduate Innovation Special Fund Project Jiangxi Province (ZS2020-S093).
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Zhuyu Zhao, **chun Xue, Jiefang **, Li Tan, Ruoyan Cai, Wenbin **a declare that they have no conflict of interest.
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Zhao, Z., Xue, J., **, J. et al. Damage Analysis of Chemically Corroded Sandstone Under Cyclic Impacts and Axial Static Pressure. Geotech Geol Eng 40, 2581–2592 (2022). https://doi.org/10.1007/s10706-022-02047-3
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DOI: https://doi.org/10.1007/s10706-022-02047-3