Comparison of the Sample Preparation Strategies and Impacts on the Tensile Strength of Gas Shale with Variable Moisture Conditions
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation Strategies of Samples with Different Saturation
2.2. Test Methods
3. Results
3.1. Relationship between Shale Tensile Strength and Saturation
3.2. Tensile Strength Dispersion
3.3. Relationship between Tensile Strength Degradation and Saturation
3.4. Failure Mode
3.5. Mechanism Analysis
4. Discussion
5. Conclusions
- (1)
- The soaking time when preparing the sample will affect the degradation effect of shale strength, that is, the longer the soaking time is, the higher is the strength degradation degree of the sample with the same moisture content. Therefore, in the process of studying the effect of different moisture contents on the tensile strength of shale, the effect of soaking time cannot be ignored.
- (2)
- Under the joint influence of moisture content and soaking time, the tensile strength of shale decreases approximately linearly with the increase in saturation. The degree of deterioration increases nonlinearly with the increase in saturation, and the growth rate increases from slow to fast.
- (3)
- In the process of sample preparation, the increase in soaking time will lead to the increase in dispersion of shale tensile strength, and may lead to the failure mode of the sample deviating from the Brazilian splitting theory model.
- (4)
- In order to reduce the strength deterioration caused by hydration when studying the effect of moisture content on shale strength, the soaking time should be reduced as much as possible when preparing the samples.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Load Mode | Target Saturation | Preparation Strategies | ||
---|---|---|---|---|
“Dry-Wet-Dry” | “Wet-Dry-Wet” | “Dry-Wet” | ||
Perpendicular to bedding | 0% | 3 | 3 | 5 |
20% | 2 | 3 | / | |
40% | 1 | 4 | 4 | |
60% | 3 | 5 | 2 | |
80% | 3 | 3 | 3 | |
100% | 4 | 3 | 3 | |
Parallel to bedding | 0% | 2 | 4 | 6 |
20% | 2 | 4 | / | |
40% | 4 | 6 | 3 | |
60% | 4 | 4 | 1 | |
80% | 3 | 5 | 3 | |
100% | 3 | 4 | 3 |
Saturation | Perpendicular Bedding Loading | Parallel Bedding Loading | ||||
---|---|---|---|---|---|---|
“Dry-Wet” | “Dry-Wet-Dry” | “Wet-Dry-Wet” | “Dry-Wet” | “Dry-Wet-Dry” | “Wet-Dry-Wet” | |
100% | 40.8% | 59.6% | 63.6% | 41.4% | 57.4% | 61.1% |
80% | 40.3% | 43.6% | 60.5% | 39.5% | 31.6% | 51.2% |
60% | 11.5% | 28.2% | 39.4% | 15.6% | 11.1% | 37.5% |
40% | 6.9% | 15.3% | 17.5% | 13.6% | 4.3% | 20.5% |
20% | 4.9% | 4.2% | 4.9% | 6.3% |
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Shu, L.; Xie, L.; He, B.; Zhang, Y. Comparison of the Sample Preparation Strategies and Impacts on the Tensile Strength of Gas Shale with Variable Moisture Conditions. Energies 2024, 17, 2327. https://doi.org/10.3390/en17102327
Shu L, Xie L, He B, Zhang Y. Comparison of the Sample Preparation Strategies and Impacts on the Tensile Strength of Gas Shale with Variable Moisture Conditions. Energies. 2024; 17(10):2327. https://doi.org/10.3390/en17102327
Chicago/Turabian StyleShu, Liuqing, Lingzhi Xie, Bo He, and Yao Zhang. 2024. "Comparison of the Sample Preparation Strategies and Impacts on the Tensile Strength of Gas Shale with Variable Moisture Conditions" Energies 17, no. 10: 2327. https://doi.org/10.3390/en17102327
APA StyleShu, L., Xie, L., He, B., & Zhang, Y. (2024). Comparison of the Sample Preparation Strategies and Impacts on the Tensile Strength of Gas Shale with Variable Moisture Conditions. Energies, 17(10), 2327. https://doi.org/10.3390/en17102327