Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling
Horizontal drains (HDs) are commonly used in the groundwater regime management of landslides. The groundwater table (GWT) profile of slopes with HDs have a complicated formation in three-dimensional (3D) space, requiring 3D analyses to obtain accurate results. However, owing to the complexity of 3D...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2022-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2022/14/e3sconf_iccee2022_03002.pdf |
| _version_ | 1818278126021509120 |
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| author | Lakruwan Mihira Kamura Akiyoshi Kazama Motoki |
| author_facet | Lakruwan Mihira Kamura Akiyoshi Kazama Motoki |
| author_sort | Lakruwan Mihira |
| collection | DOAJ |
| description | Horizontal drains (HDs) are commonly used in the groundwater regime management of landslides. The groundwater table (GWT) profile of slopes with HDs have a complicated formation in three-dimensional (3D) space, requiring 3D analyses to obtain accurate results. However, owing to the complexity of 3D simulations, idealized two-dimensional (2D) cross sections are widely used in numerical simulations of such slopes. Unfortunately, stabilities are overestimated by 2D simulations because the 3D variation of the GWT is neglected. Finite element analysis is performed in this study to evaluate the effect of 3D variation of the GWT on the stability of slopes with HDs and to evaluate the effectiveness of 2D idealizations. The results demonstrate that idealized 2D analyses neglect the high pore water pressures between HDs, thereby overestimating the slope stability, especially with high rainfall intensities and large drain spacings. Alternatively, accurate results can be obtained in 2D analyses by manually estimating an average GWT profile using the Crenshaw and Santi method for steady-state conditions. Each method has its own limitations and, therefore, the selection of an appropriate method should be made based on the specific conditions and requirements of the problem. |
| first_indexed | 2024-12-12T23:12:28Z |
| format | Article |
| id | doaj.art-25ade67cacf743159a55ad2394c01e7a |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-12T23:12:28Z |
| publishDate | 2022-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-25ade67cacf743159a55ad2394c01e7a2022-12-22T00:08:33ZengEDP SciencesE3S Web of Conferences2267-12422022-01-013470300210.1051/e3sconf/202234703002e3sconf_iccee2022_03002Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modelingLakruwan Mihira0Kamura Akiyoshi1Kazama Motoki2Geotechnical Engineering Laboratory, Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku UniversityGeotechnical Engineering Laboratory, Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku UniversityGeotechnical Engineering Laboratory, Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku UniversityHorizontal drains (HDs) are commonly used in the groundwater regime management of landslides. The groundwater table (GWT) profile of slopes with HDs have a complicated formation in three-dimensional (3D) space, requiring 3D analyses to obtain accurate results. However, owing to the complexity of 3D simulations, idealized two-dimensional (2D) cross sections are widely used in numerical simulations of such slopes. Unfortunately, stabilities are overestimated by 2D simulations because the 3D variation of the GWT is neglected. Finite element analysis is performed in this study to evaluate the effect of 3D variation of the GWT on the stability of slopes with HDs and to evaluate the effectiveness of 2D idealizations. The results demonstrate that idealized 2D analyses neglect the high pore water pressures between HDs, thereby overestimating the slope stability, especially with high rainfall intensities and large drain spacings. Alternatively, accurate results can be obtained in 2D analyses by manually estimating an average GWT profile using the Crenshaw and Santi method for steady-state conditions. Each method has its own limitations and, therefore, the selection of an appropriate method should be made based on the specific conditions and requirements of the problem.https://www.e3s-conferences.org/articles/e3sconf/pdf/2022/14/e3sconf_iccee2022_03002.pdf |
| spellingShingle | Lakruwan Mihira Kamura Akiyoshi Kazama Motoki Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling E3S Web of Conferences |
| title | Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling |
| title_full | Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling |
| title_fullStr | Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling |
| title_full_unstemmed | Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling |
| title_short | Effect of 3D water table profile of horizontal drains on slope stability and idealization of 3D-FEM flow modeling to 2D-FEM flow modeling |
| title_sort | effect of 3d water table profile of horizontal drains on slope stability and idealization of 3d fem flow modeling to 2d fem flow modeling |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2022/14/e3sconf_iccee2022_03002.pdf |
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