Support pressure for circular tunnels in two layered undrained clay
To estimate the required support pressure for stability of circular tunnels in two layered clay under undrained condition, numerical solutions are developed by performing finite element lower bound limit analysis in conjunction with second-order cone programming. The support system is assumed to off...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-02-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775519307395 |
| _version_ | 1818990478652080128 |
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| author | Bibhash Kumar Jagdish Prasad Sahoo |
| author_facet | Bibhash Kumar Jagdish Prasad Sahoo |
| author_sort | Bibhash Kumar |
| collection | DOAJ |
| description | To estimate the required support pressure for stability of circular tunnels in two layered clay under undrained condition, numerical solutions are developed by performing finite element lower bound limit analysis in conjunction with second-order cone programming. The support system is assumed to offer uniform internal compressive pressure on its periphery. From the literature, it is known that the stability of tunnels depends on the overburden pressure acting over it, which is a function of undrained cohesion and unit weight of soil, and cover of soil. When a tunnel is constructed in layered undrained clay, the stability depends on the undrained shear strength, unit weight, and thickness of one layer relative to the other layer. In the present study, the solutions are presented in a form of dimensionless charts which can be used for design of tunnel support systems for different combinations of ratios of unit weight and undrained shear strength of upper layer to those of lower layer, thickness of both layers, and total soil cover depth. Keywords: Finite elements, Layered clay, Limit analysis, Stability of tunnels |
| first_indexed | 2024-12-20T19:55:01Z |
| format | Article |
| id | doaj.art-6745d0c8967d4d19afa44b95e51cbeac |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-12-20T19:55:01Z |
| publishDate | 2020-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-6745d0c8967d4d19afa44b95e51cbeac2022-12-21T19:28:11ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552020-02-01121135148Support pressure for circular tunnels in two layered undrained clayBibhash Kumar0Jagdish Prasad Sahoo1Department of Civil Engineering, National Institute of Technology, Uttarakhand, 246174, IndiaDepartment of Civil Engineering, Indian Institute of Technology, Roorkee, 247667, India; Corresponding author. Fax: +91 1332 285568.To estimate the required support pressure for stability of circular tunnels in two layered clay under undrained condition, numerical solutions are developed by performing finite element lower bound limit analysis in conjunction with second-order cone programming. The support system is assumed to offer uniform internal compressive pressure on its periphery. From the literature, it is known that the stability of tunnels depends on the overburden pressure acting over it, which is a function of undrained cohesion and unit weight of soil, and cover of soil. When a tunnel is constructed in layered undrained clay, the stability depends on the undrained shear strength, unit weight, and thickness of one layer relative to the other layer. In the present study, the solutions are presented in a form of dimensionless charts which can be used for design of tunnel support systems for different combinations of ratios of unit weight and undrained shear strength of upper layer to those of lower layer, thickness of both layers, and total soil cover depth. Keywords: Finite elements, Layered clay, Limit analysis, Stability of tunnelshttp://www.sciencedirect.com/science/article/pii/S1674775519307395 |
| spellingShingle | Bibhash Kumar Jagdish Prasad Sahoo Support pressure for circular tunnels in two layered undrained clay Journal of Rock Mechanics and Geotechnical Engineering |
| title | Support pressure for circular tunnels in two layered undrained clay |
| title_full | Support pressure for circular tunnels in two layered undrained clay |
| title_fullStr | Support pressure for circular tunnels in two layered undrained clay |
| title_full_unstemmed | Support pressure for circular tunnels in two layered undrained clay |
| title_short | Support pressure for circular tunnels in two layered undrained clay |
| title_sort | support pressure for circular tunnels in two layered undrained clay |
| url | http://www.sciencedirect.com/science/article/pii/S1674775519307395 |
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