The Dynamic Compressive Properties and Energy Dissipation Law of Sandstone Subjected to Freeze–Thaw Damage
Abstract
:1. Introduction
2. Material Preparation and Testing Method
2.1. Sandstone Specimens
2.2. Testing Schemes of Freeze–Thaw Cycling
2.3. Static Loading and Impact Loading Testing Schemes
3. Results
3.1. Strength and Fracturing Characteristics of Freeze–Thawed Sandstone
3.1.1. Strength Characteristics of Freeze–Thawed Sandstone
3.1.2. The Fractal Dimension Characteristics of Fractured Freeze–Thawed Sandstone under Impact Loading
3.2. Law of Energy Dissipation of Freeze–Thawed Sandstone under Impact Loading
3.2.1. Change Law of Energy Dissipation Rate of Freeze–Thawed Sandstone under Different Strain Rates
3.2.2. Relationship between Peak Strength and Peak Energy Dissipation Rate for Freeze–Thawed Sandstone
3.2.3. Relationship between Peak Energy Dissipation Rate and Fractal Dimension for Freeze–Thawed Sandstone
3.2.4. Analysis of Freeze–Thaw Damage to Sandstone Based on Peak Energy Dissipation Rate
4. Conclusions
- (1)
- The peak strength of sandstone subjected to different numbers of freeze–thaw cycles increases exponentially with growing strain rate, indicating a distinct strain rate effect.
- (2)
- The DIF of the freeze–thawed sandstone increases with the increase in strain rate. There is a strain rate threshold: when strain rate is smaller than 105.96 s−1, the increasing rate of the DIF slows down with the increase in the number of freeze–thaw cycles; when strain rate is higher than 105.96 s−1, the increasing rate of the DIF grows with the increase in the number of freeze–thaw cycles.
- (3)
- In the case of the same strain rate, the fractal dimension of fractured sandstone increases with the increase in the number of freeze–thaw cycles; in the case of the same number of freeze–thaw cycles, the fractal dimension of fractured sandstone gradually increases with increasing strain rate.
- (4)
- The freeze–thaw damage variable established based on peak energy dissipation rate can be used to elucidate the damage degree of sandstone under freeze–thaw cycling, and the peak dynamic compressive strength of freeze–thawed sandstone at different strain rates is reduced with the increase in the freeze–thaw damage variable.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Dry Density (g/cm3) | P-Wave Velocity (m/s) | Porosity (%) | Uniaxial Compressive Strength (MPa) | Young’s Modulus (GPa) |
---|---|---|---|---|
2.37 | 2900 ± 50 | 9.74 | 65.54 | 9.08 |
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Jia, P.; Mao, S.; Qian, Y.; Wang, Q.; Lu, J. The Dynamic Compressive Properties and Energy Dissipation Law of Sandstone Subjected to Freeze–Thaw Damage. Water 2022, 14, 3632. https://doi.org/10.3390/w14223632
Jia P, Mao S, Qian Y, Wang Q, Lu J. The Dynamic Compressive Properties and Energy Dissipation Law of Sandstone Subjected to Freeze–Thaw Damage. Water. 2022; 14(22):3632. https://doi.org/10.3390/w14223632
Chicago/Turabian StyleJia, Peng, Songze Mao, Yijin Qian, Qiwei Wang, and Jialiang Lu. 2022. "The Dynamic Compressive Properties and Energy Dissipation Law of Sandstone Subjected to Freeze–Thaw Damage" Water 14, no. 22: 3632. https://doi.org/10.3390/w14223632