Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure
The presence of cracks significantly influences the engineering properties of unsaturated residual soil, particularly under external air pressure fluctuation (i.e. Δua). A formula is developed that integrates existing crack depth theories with factors such as soil shear strengths, effective stress p...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2025-12-01
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| Series: | Geomatics, Natural Hazards & Risk |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/19475705.2025.2451734 |
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| author | Xu-tang Xu Wen-bin Jian Ye-qing Cai Xiang-long Chen |
| author_facet | Xu-tang Xu Wen-bin Jian Ye-qing Cai Xiang-long Chen |
| author_sort | Xu-tang Xu |
| collection | DOAJ |
| description | The presence of cracks significantly influences the engineering properties of unsaturated residual soil, particularly under external air pressure fluctuation (i.e. Δua). A formula is developed that integrates existing crack depth theories with factors such as soil shear strengths, effective stress parameters, effective tensile strength reduction coefficients, and environmental changes like infiltration and evaporation. In addition, a further equation is deduced to determine the surface flow rate cracking value Q0, which can reflect the influence of seasonal climate on the matric suction of the surface soil. Our findings reveal that crack depth is quite reactive to short-term fluctuations in external air pressure, effective stress parameters and evaporation intensity, with remarkable increases in crack depth linked to these variations. The theoretical depth of soil crack increases by 0.12 ∼ 0.27m when the external air pressure fluctuation (i.e. Δua) is 3 kPa. Soils subjected to climatic conditions crack only when Q>Q0, and early cracking of soils under Δua>0 is conditioned by increasing infiltration and effective cohesion or reducing evaporation. The variation rule of the theoretical crack depth calculated in this research shows consistency with the previous equations, and the model predictions at Δua = 3kPa are proved to match well with the measured results of the practical engineering subjected to various climate environment factors. |
| format | Article |
| id | doaj-art-35d094ba8d9043019fd4b6899652e8f0 |
| institution | Kabale University |
| issn | 1947-5705 1947-5713 |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Geomatics, Natural Hazards & Risk |
| spelling | doaj-art-35d094ba8d9043019fd4b6899652e8f02025-01-19T16:26:14ZengTaylor & Francis GroupGeomatics, Natural Hazards & Risk1947-57051947-57132025-12-0116110.1080/19475705.2025.2451734Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressureXu-tang Xu0Wen-bin Jian1Ye-qing Cai2Xiang-long Chen3College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou, ChinaZijin School of Geology and Mining, Fuzhou University, Fuzhou, ChinaCollege of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou, ChinaCollege of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou, ChinaThe presence of cracks significantly influences the engineering properties of unsaturated residual soil, particularly under external air pressure fluctuation (i.e. Δua). A formula is developed that integrates existing crack depth theories with factors such as soil shear strengths, effective stress parameters, effective tensile strength reduction coefficients, and environmental changes like infiltration and evaporation. In addition, a further equation is deduced to determine the surface flow rate cracking value Q0, which can reflect the influence of seasonal climate on the matric suction of the surface soil. Our findings reveal that crack depth is quite reactive to short-term fluctuations in external air pressure, effective stress parameters and evaporation intensity, with remarkable increases in crack depth linked to these variations. The theoretical depth of soil crack increases by 0.12 ∼ 0.27m when the external air pressure fluctuation (i.e. Δua) is 3 kPa. Soils subjected to climatic conditions crack only when Q>Q0, and early cracking of soils under Δua>0 is conditioned by increasing infiltration and effective cohesion or reducing evaporation. The variation rule of the theoretical crack depth calculated in this research shows consistency with the previous equations, and the model predictions at Δua = 3kPa are proved to match well with the measured results of the practical engineering subjected to various climate environment factors.https://www.tandfonline.com/doi/10.1080/19475705.2025.2451734Unsaturated residual soilcrack propagation depthshort-term variations in external air pressurestrength parameterssurface flow ratio |
| spellingShingle | Xu-tang Xu Wen-bin Jian Ye-qing Cai Xiang-long Chen Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure Geomatics, Natural Hazards & Risk Unsaturated residual soil crack propagation depth short-term variations in external air pressure strength parameters surface flow ratio |
| title | Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure |
| title_full | Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure |
| title_fullStr | Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure |
| title_full_unstemmed | Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure |
| title_short | Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure |
| title_sort | research on influential factors of crack propagation depth of unsaturated residual soils under short term variations in external air pressure |
| topic | Unsaturated residual soil crack propagation depth short-term variations in external air pressure strength parameters surface flow ratio |
| url | https://www.tandfonline.com/doi/10.1080/19475705.2025.2451734 |
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