Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis
The study conducted a pure rotation test of 720° for saturated remolded Q2 loess under principal stress axis (PSA) rotation when deviatoric stress and the intermediate principal stress ratio are different, also paying attention to examining the changes of strain accumulation and pore pressure of suc...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-10-01
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| Series: | Frontiers in Ecology and Evolution |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fevo.2023.1275648/full |
| _version_ | 1797663284605747200 |
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| author | Sui Wang Sui Wang Sui Wang Zuliang Zhong Zuliang Zhong Bin Chen Bo Wu Dongyu Zhang Fuxing Ni |
| author_facet | Sui Wang Sui Wang Sui Wang Zuliang Zhong Zuliang Zhong Bin Chen Bo Wu Dongyu Zhang Fuxing Ni |
| author_sort | Sui Wang |
| collection | DOAJ |
| description | The study conducted a pure rotation test of 720° for saturated remolded Q2 loess under principal stress axis (PSA) rotation when deviatoric stress and the intermediate principal stress ratio are different, also paying attention to examining the changes of strain accumulation and pore pressure of such loess. According to the test, as the PSA rotates continuously, the pore water pressure exhibited by saturated remolded loess presents a normal cyclic accumulation elevation, and under the same deviatoric stress conditions, the pore water pressure accumulation trend of different principal stress ratios is the same; however, the magnitude is different. The increment of pore water pressure becomes smaller as the number of cycles increases. When the deviatoric stress level is low, the material hardening is in a cyclic stable state, the strain component remains stable with the continuous rotation of the PSA, and the strain path area is reduced, together with a stable final size. In case of higher deviatoric stress, the material strength cycle becomes weaker and the strain component accumulates slowly as the PSA (the spiral line of the strain path) continuously rotates in the γzθ−(ϵz−ϵθ) plane, and gradually expands until failure. The increased intermediate principal stress is accompanied by accelerated strain development speed and advanced failure. |
| first_indexed | 2024-03-11T19:12:17Z |
| format | Article |
| id | doaj.art-933b2f9669ac4c85a6912cf84721ca83 |
| institution | Directory Open Access Journal |
| issn | 2296-701X |
| language | English |
| last_indexed | 2024-03-11T19:12:17Z |
| publishDate | 2023-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Ecology and Evolution |
| spelling | doaj.art-933b2f9669ac4c85a6912cf84721ca832023-10-09T11:16:46ZengFrontiers Media S.A.Frontiers in Ecology and Evolution2296-701X2023-10-011110.3389/fevo.2023.12756481275648Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axisSui Wang0Sui Wang1Sui Wang2Zuliang Zhong3Zuliang Zhong4Bin Chen5Bo Wu6Dongyu Zhang7Fuxing Ni8School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo, ChinaCollege of Civil Engineering, Chongqing University, Chongqing, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing, ChinaCollege of Civil Engineering, Chongqing University, Chongqing, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing, ChinaSchool of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo, ChinaSchool of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo, ChinaSchool of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo, ChinaSchool of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo, ChinaThe study conducted a pure rotation test of 720° for saturated remolded Q2 loess under principal stress axis (PSA) rotation when deviatoric stress and the intermediate principal stress ratio are different, also paying attention to examining the changes of strain accumulation and pore pressure of such loess. According to the test, as the PSA rotates continuously, the pore water pressure exhibited by saturated remolded loess presents a normal cyclic accumulation elevation, and under the same deviatoric stress conditions, the pore water pressure accumulation trend of different principal stress ratios is the same; however, the magnitude is different. The increment of pore water pressure becomes smaller as the number of cycles increases. When the deviatoric stress level is low, the material hardening is in a cyclic stable state, the strain component remains stable with the continuous rotation of the PSA, and the strain path area is reduced, together with a stable final size. In case of higher deviatoric stress, the material strength cycle becomes weaker and the strain component accumulates slowly as the PSA (the spiral line of the strain path) continuously rotates in the γzθ−(ϵz−ϵθ) plane, and gradually expands until failure. The increased intermediate principal stress is accompanied by accelerated strain development speed and advanced failure.https://www.frontiersin.org/articles/10.3389/fevo.2023.1275648/fullsaturated loessprincipal stress axis rotationcyclic degradationstrain accumulationpore pressure accumulation |
| spellingShingle | Sui Wang Sui Wang Sui Wang Zuliang Zhong Zuliang Zhong Bin Chen Bo Wu Dongyu Zhang Fuxing Ni Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis Frontiers in Ecology and Evolution saturated loess principal stress axis rotation cyclic degradation strain accumulation pore pressure accumulation |
| title | Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis |
| title_full | Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis |
| title_fullStr | Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis |
| title_full_unstemmed | Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis |
| title_short | Experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis |
| title_sort | experimental study on strain accumulation characteristics of saturated remolded loess under pure rotation of the principal stress axis |
| topic | saturated loess principal stress axis rotation cyclic degradation strain accumulation pore pressure accumulation |
| url | https://www.frontiersin.org/articles/10.3389/fevo.2023.1275648/full |
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