Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle
This study is based on the tunnel-face slope engineering of Dongfeng tunnel in Shanxi section of China’s Shuozhou-Huanghua Railway. The sandstone specimens in the perennial freeze-thaw zone of the slope were collected to carry out freeze-thaw cycle static physical mechanics test and split Hopkinson...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2020/8827169 |
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| author | Qingsong Pu Junhong Huang Fuling Zeng Yi Luo Xinping Li Jixue Zhou Shilong Zheng |
| author_facet | Qingsong Pu Junhong Huang Fuling Zeng Yi Luo Xinping Li Jixue Zhou Shilong Zheng |
| author_sort | Qingsong Pu |
| collection | DOAJ |
| description | This study is based on the tunnel-face slope engineering of Dongfeng tunnel in Shanxi section of China’s Shuozhou-Huanghua Railway. The sandstone specimens in the perennial freeze-thaw zone of the slope were collected to carry out freeze-thaw cycle static physical mechanics test and split Hopkinson pressure bar (SHPB) dynamic mechanical test. Thus, the damage process of sandstone under freeze-thaw cycle and impact load is studied. Also, the dynamic compressive strength and dynamic elastic modulus of sandstone are analysed under different loading strain rates and freeze-thaw cycle based on LS-DYNA, a dynamic finite element program. The results showed that the dynamic compressive strength of sandstone subjected to multiple freeze-thaw cycles under 0.04 MPa air pressure has a greater damage ratio than that under 0.055 MPa and 0.07 MPa air pressure, which was more likely to cause damage to slope sandstone than in actual engineering; the dynamic compressive strength and elastic modulus of sandstone decrease greatly within a certain range of freeze-thaw cycles and loading strain rate, leading to significant deterioration. When the freeze-thaw cycle exceeded 200 times and the strain rate was greater than 200 s−1, the physical and mechanical properties of sandstone gradually tended to be stable. |
| format | Article |
| id | doaj-art-9f323ced8f724c2380a04d2543430a4b |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-9f323ced8f724c2380a04d2543430a4b2025-02-03T00:59:41ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/88271698827169Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw CycleQingsong Pu0Junhong Huang1Fuling Zeng2Yi Luo3Xinping Li4Jixue Zhou5Shilong Zheng6Hubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaHubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaHubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaHubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaHubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaHubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaHubei Key Laboratory of Roadway Bridge and Structure, Wuhan University of Technology, Wuhan, ChinaThis study is based on the tunnel-face slope engineering of Dongfeng tunnel in Shanxi section of China’s Shuozhou-Huanghua Railway. The sandstone specimens in the perennial freeze-thaw zone of the slope were collected to carry out freeze-thaw cycle static physical mechanics test and split Hopkinson pressure bar (SHPB) dynamic mechanical test. Thus, the damage process of sandstone under freeze-thaw cycle and impact load is studied. Also, the dynamic compressive strength and dynamic elastic modulus of sandstone are analysed under different loading strain rates and freeze-thaw cycle based on LS-DYNA, a dynamic finite element program. The results showed that the dynamic compressive strength of sandstone subjected to multiple freeze-thaw cycles under 0.04 MPa air pressure has a greater damage ratio than that under 0.055 MPa and 0.07 MPa air pressure, which was more likely to cause damage to slope sandstone than in actual engineering; the dynamic compressive strength and elastic modulus of sandstone decrease greatly within a certain range of freeze-thaw cycles and loading strain rate, leading to significant deterioration. When the freeze-thaw cycle exceeded 200 times and the strain rate was greater than 200 s−1, the physical and mechanical properties of sandstone gradually tended to be stable.http://dx.doi.org/10.1155/2020/8827169 |
| spellingShingle | Qingsong Pu Junhong Huang Fuling Zeng Yi Luo Xinping Li Jixue Zhou Shilong Zheng Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle Shock and Vibration |
| title | Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle |
| title_full | Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle |
| title_fullStr | Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle |
| title_full_unstemmed | Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle |
| title_short | Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle |
| title_sort | study on long term dynamic mechanical properties and degradation law of sandstone under freeze thaw cycle |
| url | http://dx.doi.org/10.1155/2020/8827169 |
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