Study on the Conventional Uniaxial Mechanical Properties and Micro-Mechanism of Sandstone under Dry–Wet Cycles
Abstract
:1. Introduction
1.1. Sample Processing
1.2. Test Procedure
1.3. Experimental Plan
2. Test Results and Analysis
2.1. Analysis of Microcosmic Characteristics of Samples after Drying and Wetting Cycles
2.2. Change in the Physical Properties of the Sample
2.3. The Stress–Strain Curves of Samples with Different Wetting and Drying Cycles
2.4. Strength Characteristics
2.5. Deformation Feature
2.6. Analysis of the Failure Mode
3. Discussion
4. Conclusions and Suggestions
4.1. Conclusions
- (1)
- The intergranular connection of sandstone is a stratified structure, and the intergranular connection between the underlayer structures gradually becomes loose under the action of drying and wetting circulation. When the circulation reaches a certain extent, certain particle deposition occurs between the stratified structures inside the sample. After the drying and wetting cycle, the drying quality of the sample gradually decreases, and the water absorption quality gradually increases. The internal components of sandstone appear to dissolve under the action of water, and certain pores are formed inside.
- (2)
- The stress–strain curves of the samples show four stages. The peak strength decreases first and then increases with the number of cycles. The change in the elastic modulus and deformation modulus is similar to the change in the peak strength with the number of cycles. This is related to the peak strain variation in the connection between the layered structures in the sandstone, and the drying and wetting cycle does not increase the ductility of the rock.
- (3)
- The samples with different numbers of drying and wetting cycles exhibit typical axial tensile failure under uniaxial action. The tensile cracks on the surface of the samples show an increasing trend with increasing drying and wetting cycles. The sandstone surface exhibits block spalling when the number of drying and wetting cycles is less (8 times).
4.2. Suggestions
- (1)
- This article only considers the mechanical characteristics under uniaxial loading, while rocks in nature are often in a certain confining pressure environment. Therefore, experiments on rock mechanical properties under different confining pressures and dry–wet cycling can be conducted to obtain more reliable patterns.
- (2)
- The liquid used for dry–wet cycling in this study is water, while the water encountered in actual engineering often contains acidity and alkalinity. Therefore, further research and improvement are needed to obtain research parameters that are more in line with actual conditions.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Sample Number | Number of Drying and Wetting Cycles/n | Loading Method | Loading Rate |
---|---|---|---|
1-1 | 1 | stress control | 1 KN/s |
2-1 | 8 | ||
3-1 | 16 | ||
4-1 | 24 |
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Zhang, J.; Peng, S.; Yang, Y. Study on the Conventional Uniaxial Mechanical Properties and Micro-Mechanism of Sandstone under Dry–Wet Cycles. J. Compos. Sci. 2023, 7, 494. https://doi.org/10.3390/jcs7120494
Zhang J, Peng S, Yang Y. Study on the Conventional Uniaxial Mechanical Properties and Micro-Mechanism of Sandstone under Dry–Wet Cycles. Journal of Composites Science. 2023; 7(12):494. https://doi.org/10.3390/jcs7120494
Chicago/Turabian StyleZhang, Jinsong, Shilong Peng, and Yudi Yang. 2023. "Study on the Conventional Uniaxial Mechanical Properties and Micro-Mechanism of Sandstone under Dry–Wet Cycles" Journal of Composites Science 7, no. 12: 494. https://doi.org/10.3390/jcs7120494