Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023
On December 18, 2023, the M S 6.2 Jishishan earthquake triggered a large-scale liquefaction disaster of loess sites in Jintian and Caotan villages, Zhongchuan town, Minhe County, Haidong City, Qinghai Province. To clarify the micro-mechanism of the liquefaction disaster, the Q3 Malan...
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De Gruyter
2025-02-01
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| Online Access: | https://doi.org/10.1515/geo-2022-0751 |
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| author | Wang Yi Wang Qian Zhang Wuyu Zhong Xiumei Liu Fuqiang Jia Shichao Hu Xuefeng |
| author_facet | Wang Yi Wang Qian Zhang Wuyu Zhong Xiumei Liu Fuqiang Jia Shichao Hu Xuefeng |
| author_sort | Wang Yi |
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| description | On December 18, 2023, the M
S 6.2 Jishishan earthquake triggered a large-scale liquefaction disaster of loess sites in Jintian and Caotan villages, Zhongchuan town, Minhe County, Haidong City, Qinghai Province. To clarify the micro-mechanism of the liquefaction disaster, the Q3 Malan loess layer of the disaster site and its overlying red silty clay layer samples were selected and quantitatively analyzed for the differences in physical properties, structure, microstructural parameters, and mineral compositions. Based on the discrepancy results, the micro-mechanisms between loess microstructure and macro-mechanical properties of soil and liquefaction disaster were investigated. The research shows that compared with red silty clay, the dynamic index of loess corresponding to the physical indices of Zhongchuan loess obviously exceeds the critical threshold of liquefaction under actual seismic intensity. Additionally, its pore structure is dominated by point contact and weakly cemented overhead macropore structure, and its quantitative pore microstructure parameters and mineral composition show significant liquefaction potential. The comprehensive analysis of the liquefaction mechanism shows that the rapid deformation of the soil skeleton and the destruction of the cementation and contact system of the water-sensitive minerals under seismic loading and hydraulic force lead to the collapse of the overhead macropores, the damage of structural strength, the increase of the complex pore channels, the rapid accumulation of pore water pressure, and the reduction of the effective stress, which leads to the liquefaction of the loess. |
| format | Article |
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| institution | Kabale University |
| issn | 2391-5447 |
| language | English |
| publishDate | 2025-02-01 |
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| spelling | doaj-art-c8b9307012e1429f87cc61d536b708242025-02-10T13:24:16ZengDe GruyterOpen Geosciences2391-54472025-02-011711002854310.1515/geo-2022-0751Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023Wang Yi0Wang Qian1Zhang Wuyu2Zhong Xiumei3Liu Fuqiang4Jia Shichao5Hu Xuefeng6Lanzhou Institute of Seismology, CEA, Lanzhou730000, People’s Republic of ChinaLanzhou Institute of Seismology, CEA, Lanzhou730000, People’s Republic of ChinaSchool of Civil Engineering and Water Resources, Qinghai University, Xining810000, People’s Republic of ChinaLanzhou Institute of Seismology, CEA, Lanzhou730000, People’s Republic of ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou730000, People’s Republic of ChinaLanzhou Institute of Seismology, CEA, Lanzhou730000, People’s Republic of ChinaLanzhou Institute of Seismology, CEA, Lanzhou730000, People’s Republic of ChinaOn December 18, 2023, the M S 6.2 Jishishan earthquake triggered a large-scale liquefaction disaster of loess sites in Jintian and Caotan villages, Zhongchuan town, Minhe County, Haidong City, Qinghai Province. To clarify the micro-mechanism of the liquefaction disaster, the Q3 Malan loess layer of the disaster site and its overlying red silty clay layer samples were selected and quantitatively analyzed for the differences in physical properties, structure, microstructural parameters, and mineral compositions. Based on the discrepancy results, the micro-mechanisms between loess microstructure and macro-mechanical properties of soil and liquefaction disaster were investigated. The research shows that compared with red silty clay, the dynamic index of loess corresponding to the physical indices of Zhongchuan loess obviously exceeds the critical threshold of liquefaction under actual seismic intensity. Additionally, its pore structure is dominated by point contact and weakly cemented overhead macropore structure, and its quantitative pore microstructure parameters and mineral composition show significant liquefaction potential. The comprehensive analysis of the liquefaction mechanism shows that the rapid deformation of the soil skeleton and the destruction of the cementation and contact system of the water-sensitive minerals under seismic loading and hydraulic force lead to the collapse of the overhead macropores, the damage of structural strength, the increase of the complex pore channels, the rapid accumulation of pore water pressure, and the reduction of the effective stress, which leads to the liquefaction of the loess.https://doi.org/10.1515/geo-2022-0751jishishan earthquakeloess liquefactionmicrostructuremicro-mechanismflow slide |
| spellingShingle | Wang Yi Wang Qian Zhang Wuyu Zhong Xiumei Liu Fuqiang Jia Shichao Hu Xuefeng Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023 Open Geosciences jishishan earthquake loess liquefaction microstructure micro-mechanism flow slide |
| title | Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023 |
| title_full | Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023 |
| title_fullStr | Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023 |
| title_full_unstemmed | Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023 |
| title_short | Micro-mechanism analysis of Zhongchuan loess liquefaction disaster induced by Jishishan M6.2 earthquake in 2023 |
| title_sort | micro mechanism analysis of zhongchuan loess liquefaction disaster induced by jishishan m6 2 earthquake in 2023 |
| topic | jishishan earthquake loess liquefaction microstructure micro-mechanism flow slide |
| url | https://doi.org/10.1515/geo-2022-0751 |
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