Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil
Excavations near an existing tunnel are often encountered in underground construction. The influence of the excavation on the adjacent tunnels is not yet fully understood. This study presented a centrifugal model test about excavation next to existing tunnels in soft soil foundation. The bending mom...
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2021-01-01
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Series: | Mathematical Problems in Engineering |
Online Access: | http://dx.doi.org/10.1155/2021/5587857 |
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doaj-29690c069a3b44828374920c8faf9eae2021-05-03T00:00:11ZengHindawi LimitedMathematical Problems in Engineering1563-51472021-01-01202110.1155/2021/5587857Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft SoilZi-Tian Yu0Heng-Yu Wang1Wenjun Wang2Dao-Sheng Ling3Xue-Dong Zhang4Can Wang5Yong-Hao Qu6Institute of Geotechnical EngineeringSchool of Civil Engineering and ArchitectureSchool of Civil Engineering and ArchitectureInstitute of Geotechnical EngineeringDepartment of Geotechnical EngineeringChina Harbour Engineering Company LTDChina Railway Construction Bridge Engineering Bureau Group Company LTDExcavations near an existing tunnel are often encountered in underground construction. The influence of the excavation on the adjacent tunnels is not yet fully understood. This study presented a centrifugal model test about excavation next to existing tunnels in soft soil foundation. The bending moment of diaphragm wall, surface settlement, tunnel deformation, and earth pressure around the tunnel were mainly studied. The influence of tunnel location is further studied by numerical simulation. During the stabilization stage of foundation pit, the diaphragm walls present convex deformation towards foundation pit, and the surface settlement outside the diaphragm wall appears to be the concave groove type. During the overexcavation stage, the diaphragm walls are almost damaged, and the shear bands are nearly tangent to the tunnels. The displacement of the tunnels and the surface settlement rapidly increase. The deformation of the diaphragm wall and the surface settlement are limited by the existing tunnel. The numerical results indicate that the change of tunnel location has little effect on the retaining wall but an obvious effect on the tunnel itself.http://dx.doi.org/10.1155/2021/5587857 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zi-Tian Yu Heng-Yu Wang Wenjun Wang Dao-Sheng Ling Xue-Dong Zhang Can Wang Yong-Hao Qu |
spellingShingle |
Zi-Tian Yu Heng-Yu Wang Wenjun Wang Dao-Sheng Ling Xue-Dong Zhang Can Wang Yong-Hao Qu Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil Mathematical Problems in Engineering |
author_facet |
Zi-Tian Yu Heng-Yu Wang Wenjun Wang Dao-Sheng Ling Xue-Dong Zhang Can Wang Yong-Hao Qu |
author_sort |
Zi-Tian Yu |
title |
Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil |
title_short |
Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil |
title_full |
Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil |
title_fullStr |
Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil |
title_full_unstemmed |
Experimental and Numerical Investigation on the Effects of Foundation Pit Excavation on Adjacent Tunnels in Soft Soil |
title_sort |
experimental and numerical investigation on the effects of foundation pit excavation on adjacent tunnels in soft soil |
publisher |
Hindawi Limited |
series |
Mathematical Problems in Engineering |
issn |
1563-5147 |
publishDate |
2021-01-01 |
description |
Excavations near an existing tunnel are often encountered in underground construction. The influence of the excavation on the adjacent tunnels is not yet fully understood. This study presented a centrifugal model test about excavation next to existing tunnels in soft soil foundation. The bending moment of diaphragm wall, surface settlement, tunnel deformation, and earth pressure around the tunnel were mainly studied. The influence of tunnel location is further studied by numerical simulation. During the stabilization stage of foundation pit, the diaphragm walls present convex deformation towards foundation pit, and the surface settlement outside the diaphragm wall appears to be the concave groove type. During the overexcavation stage, the diaphragm walls are almost damaged, and the shear bands are nearly tangent to the tunnels. The displacement of the tunnels and the surface settlement rapidly increase. The deformation of the diaphragm wall and the surface settlement are limited by the existing tunnel. The numerical results indicate that the change of tunnel location has little effect on the retaining wall but an obvious effect on the tunnel itself. |
url |
http://dx.doi.org/10.1155/2021/5587857 |
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