Influence of the Angular Position of a New Tunnel on Movement in the Surrounding Existing Tunnel
The development of transportation in large cities requires the construction of new structures subterranean in close proximity to existed structures subterranean. Finding the best appropriate position of the new structure subterranean will help to minimize the magnitude of movement there will be in s...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Sciendo
2024-12-01
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| Series: | Selected Scientific Papers: Journal of Civil Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.2478/sspjce-2024-0016 |
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| Summary: | The development of transportation in large cities requires the construction of new structures subterranean in close proximity to existed structures subterranean. Finding the best appropriate position of the new structure subterranean will help to minimize the magnitude of movement there will be in soil surrounding the existing one. The purpose of this study is to involve assessing the immediate influences that will result from the new tunnel excavation in close proximity to existed tunnel at different angular positions ß (0° to 180°) relative to existing one, especially destabilization of the soil surrounding, including movements, displacements of soil mass and surface settlement, in addition to internal efforts generated in lining of old tunnel, and to provide a solution by selecting an ideal angular position for the tunnel that will be excavated relative to the existing one. This is a crucial factor when searching for a full solution to the problem of interactions between subterranean structures. This study uses numerical analysis to examine the movements and displacements of soil mass surrounding, the settlement and the internal efforts induced in the old tunnel’s lining impacted by the new tunnel excavation. Several factors, such as the excavation technique, tunnel spacing, liner thickness, etc., had a favorable impact on diminishing the extreme values acquired at the critical angle position (ß =135°). A parametric study was conducted to minimize the maximum values obtained. As a result, these elements could affect planning and security objectives. |
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| ISSN: | 1338-7278 |