Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling
During power transmission, dry landslide debris flow usually causes severe dynamic erosion when interacting with loose, water-bearing basement materials on slopes or within channels. This interaction leads to a significant increase in the scale of debris flow, posing a serious threat to infrastructu...
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| Format: | Article |
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Editorial Office of Hydrogeology & Engineering Geology
2025-03-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
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| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202401014 |
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| author | Zihao HUO Shilin ZHANG Xiewen HU Weiwei XIE Jianfeng TANG Xurong HE Wenpei WANG |
| author_facet | Zihao HUO Shilin ZHANG Xiewen HU Weiwei XIE Jianfeng TANG Xurong HE Wenpei WANG |
| author_sort | Zihao HUO |
| collection | DOAJ |
| description | During power transmission, dry landslide debris flow usually causes severe dynamic erosion when interacting with loose, water-bearing basement materials on slopes or within channels. This interaction leads to a significant increase in the scale of debris flow, posing a serious threat to infrastructure and human lives. Simultaneously, interstitial fluid is entrained into the bottom of the debris flow with the solid particles. The exchange of materials makes the flow change from single-phase to solid-liquid two-phase state, critically influencing the rheological and mechanical behavior of the debris flow.However, few studies investigated the fluidization mechanism of debris flow. This study employs smoothed particle hydrodynamics-discrete element-finite element (SPH-DEM-FEM) coupling theory, combined with large-scale physical model tests, to investigate the complex dynamic interactions between dry debris flows and substrates under varying moisture conditions. The results show that the contact between the leading edge of the debris flow and the basement is mainly characterized by punching failure and ploughing, and the contact surface is dominated by shear abrasion. With the increases of basement stress and pore water pressure, the debris flow is mixed with water-bearing material, and gradually presents the fluidization characteristics. Under the impact loading of debris flow, the base stress in the eroded area exhibits an “advanced fluctuation” phenomenon. The stress of the leading edge shows a significant increase due to the impact of debris flow. The base stress in the middle of the eroded area shows a parabolic curve with a slight amplitude and a long duration due to the leap of particles. The base stress of the trailing edge presents a curve with a peak value lower than that of the leading edge. With the change of substrate material from dry condition to unsaturated condition, the shear stress, and moisture content of the contact surface show a positive correlation trend. The erosion rate of the substrate, the impact distance of the debris flow, and the final accumulation thickness display a parabolic correlation with the moisture content. The results provide the understanding of the fluidization mechanism in debris flows and provide effective scientific insights for the study of similar mechanisms. |
| format | Article |
| id | doaj-art-8b4d155061ee4ebcb882b124d15924ed |
| institution | DOAJ |
| issn | 1000-3665 |
| language | zho |
| publishDate | 2025-03-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj-art-8b4d155061ee4ebcb882b124d15924ed2025-08-20T03:06:53ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652025-03-0152213814910.16030/j.cnki.issn.1000-3665.202401014202401014Erosion fluidization mechanism of landslide debris flow based on solid-liquid couplingZihao HUO0Shilin ZHANG1Xiewen HU2Weiwei XIE3Jianfeng TANG4Xurong HE5Wenpei WANG6Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, ChinaFaculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, ChinaFaculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, ChinaPowerChina Chengdu Engineering Corporation Limited, Chengdu, Sichuan 610072，ChinaFaculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, ChinaChina Center for Resources Satellite Data and Application, Beijing 100094, ChinaChina Institute of Geo-Environment Monitoring （Guide Center of Prevention Technology for Geo-Hazards, MNR）, Beijing 100081, ChinaDuring power transmission, dry landslide debris flow usually causes severe dynamic erosion when interacting with loose, water-bearing basement materials on slopes or within channels. This interaction leads to a significant increase in the scale of debris flow, posing a serious threat to infrastructure and human lives. Simultaneously, interstitial fluid is entrained into the bottom of the debris flow with the solid particles. The exchange of materials makes the flow change from single-phase to solid-liquid two-phase state, critically influencing the rheological and mechanical behavior of the debris flow.However, few studies investigated the fluidization mechanism of debris flow. This study employs smoothed particle hydrodynamics-discrete element-finite element (SPH-DEM-FEM) coupling theory, combined with large-scale physical model tests, to investigate the complex dynamic interactions between dry debris flows and substrates under varying moisture conditions. The results show that the contact between the leading edge of the debris flow and the basement is mainly characterized by punching failure and ploughing, and the contact surface is dominated by shear abrasion. With the increases of basement stress and pore water pressure, the debris flow is mixed with water-bearing material, and gradually presents the fluidization characteristics. Under the impact loading of debris flow, the base stress in the eroded area exhibits an “advanced fluctuation” phenomenon. The stress of the leading edge shows a significant increase due to the impact of debris flow. The base stress in the middle of the eroded area shows a parabolic curve with a slight amplitude and a long duration due to the leap of particles. The base stress of the trailing edge presents a curve with a peak value lower than that of the leading edge. With the change of substrate material from dry condition to unsaturated condition, the shear stress, and moisture content of the contact surface show a positive correlation trend. The erosion rate of the substrate, the impact distance of the debris flow, and the final accumulation thickness display a parabolic correlation with the moisture content. The results provide the understanding of the fluidization mechanism in debris flows and provide effective scientific insights for the study of similar mechanisms.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202401014fluid-structure interactionlandslide-debris avalanchedynamic erosionmoisture contentmechanistic studies |
| spellingShingle | Zihao HUO Shilin ZHANG Xiewen HU Weiwei XIE Jianfeng TANG Xurong HE Wenpei WANG Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling Shuiwen dizhi gongcheng dizhi fluid-structure interaction landslide-debris avalanche dynamic erosion moisture content mechanistic studies |
| title | Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling |
| title_full | Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling |
| title_fullStr | Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling |
| title_full_unstemmed | Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling |
| title_short | Erosion fluidization mechanism of landslide debris flow based on solid-liquid coupling |
| title_sort | erosion fluidization mechanism of landslide debris flow based on solid liquid coupling |
| topic | fluid-structure interaction landslide-debris avalanche dynamic erosion moisture content mechanistic studies |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202401014 |
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