Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle
This study attempts to investigate the dynamic tensile mechanical properties of sandstone under freeze-thaw cycle by using the split Hopkinson pressure bar (SHPB)test system to perform dynamic splitting tests on sandstone samples with freeze-thaw cycle 0, 10, 20 and 40 times at different impact spee...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2024-04-01
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| Series: | 矿业科学学报 |
| Subjects: | |
| Online Access: | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2024.02.007 |
| _version_ | 1797215335223394304 |
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| author | YANG Guoliang SHANG Zhuo ZOU Zehua BI Jingjiu DONG Zhiwen |
| author_facet | YANG Guoliang SHANG Zhuo ZOU Zehua BI Jingjiu DONG Zhiwen |
| author_sort | YANG Guoliang |
| collection | DOAJ |
| description | This study attempts to investigate the dynamic tensile mechanical properties of sandstone under freeze-thaw cycle by using the split Hopkinson pressure bar (SHPB)test system to perform dynamic splitting tests on sandstone samples with freeze-thaw cycle 0, 10, 20 and 40 times at different impact speeds.Also adopting the high-speed digital image correlation (DIC), we observed the dynamic tensile failure process of the specimen, where we analyzed the strength characteristics, deformation process and failure form of frozen sandstone under dynamic tensile stress in different freeze-thaw cycles.Results show that 1)the dynamic tensile σ-t curves of frozen sandstone and ordinary sandstone exhibit similar patterns of stress variation under different freeze-thaw cycles, which can be divided into four stages: low speed growth section, high speed growth section, peak plateau section and decreasing section; 2)the peak tensile stress increases linearly with the increase of stress loading rate; 3)the peak tensile stress of frozen rock has a certain freeze-thaw cycle effect, and there is a strong correlation between the peak tensile stress and the number of freeze-thaw cycles.The dynamic tensile strength of frozen rock increases first and then decreases as the number of freeze-thaw cycles increases.Under the same impact pressure, the frozen rock specimen shows certain freeze-thaw cycle effect as the tensile strain at the center shows N=40>20>0>10 under 4 kinds of freeze-thaw cycles. |
| first_indexed | 2024-04-24T11:28:26Z |
| format | Article |
| id | doaj.art-0db90b7e3ce848a694011d025358d1eb |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-04-24T11:28:26Z |
| publishDate | 2024-04-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-0db90b7e3ce848a694011d025358d1eb2024-04-10T12:16:19ZengEmergency Management Press矿业科学学报2096-21932024-04-019219920810.19606/j.cnki.jmst.2024.02.007kykxxb-9-2-199Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycleYANG Guoliang0SHANG Zhuo1ZOU Zehua2BI Jingjiu3DONG Zhiwen4School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaThis study attempts to investigate the dynamic tensile mechanical properties of sandstone under freeze-thaw cycle by using the split Hopkinson pressure bar (SHPB)test system to perform dynamic splitting tests on sandstone samples with freeze-thaw cycle 0, 10, 20 and 40 times at different impact speeds.Also adopting the high-speed digital image correlation (DIC), we observed the dynamic tensile failure process of the specimen, where we analyzed the strength characteristics, deformation process and failure form of frozen sandstone under dynamic tensile stress in different freeze-thaw cycles.Results show that 1)the dynamic tensile σ-t curves of frozen sandstone and ordinary sandstone exhibit similar patterns of stress variation under different freeze-thaw cycles, which can be divided into four stages: low speed growth section, high speed growth section, peak plateau section and decreasing section; 2)the peak tensile stress increases linearly with the increase of stress loading rate; 3)the peak tensile stress of frozen rock has a certain freeze-thaw cycle effect, and there is a strong correlation between the peak tensile stress and the number of freeze-thaw cycles.The dynamic tensile strength of frozen rock increases first and then decreases as the number of freeze-thaw cycles increases.Under the same impact pressure, the frozen rock specimen shows certain freeze-thaw cycle effect as the tensile strain at the center shows N=40>20>0>10 under 4 kinds of freeze-thaw cycles.http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2024.02.007freeze-thaw cyclestress loading rateshpbstrain rate effectdynamic drawingdic |
| spellingShingle | YANG Guoliang SHANG Zhuo ZOU Zehua BI Jingjiu DONG Zhiwen Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle 矿业科学学报 freeze-thaw cycle stress loading rate shpb strain rate effect dynamic drawing dic |
| title | Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle |
| title_full | Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle |
| title_fullStr | Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle |
| title_full_unstemmed | Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle |
| title_short | Study on dynamic splitting and evolution mechanism of sandstone under freeze-thaw cycle |
| title_sort | study on dynamic splitting and evolution mechanism of sandstone under freeze thaw cycle |
| topic | freeze-thaw cycle stress loading rate shpb strain rate effect dynamic drawing dic |
| url | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2024.02.007 |
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