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Analysis of the Ground Deformation Due to Shield Tunnel Excavation

Author: LiLei
Tutor: LiLiXin
School: Shenyang University of construction
Course: Structural Engineering
Keywords: Subway tunnel Surface deformation Lining Execavation depth Tunneldiameter Elastic modulus
CLC: U455.43
Type: Master's thesis
Year: 2012
Downloads: 45
Quote: 0
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Abstract


Regardless of the methods of tunnel construction, the soil original stress balance around oftunnel will be destructed, and the ground movement will be occurred. The surface displacementand deformation around of tunnel will be produced. And the safety of buildings and facilities,roads and underground pipelines may be endangered. Although domestic and foreign scholarshave made a lot of researches, but due to the complexity and difference of engineering geologicalconditions, the surface displacement caused by tunnel excavation can not be predicted accurately.Therefore, the further researches are needed. This paper based on the background of shenyangMetro Line,Style Road Station——Industrial Exhibition Station, actual engineering data. Andapplication of ABAQUS Finite Element Analysis Software for tunnel excavation analysis, themain as follows:These are studied that the lining impact on surface displacement and deformation, causedby tunnel excavation, applied finite element method. Analysis of the change rules of surfacedisplacement, soil stress and strain state; the vertical force and horizontal displacement of lining;and the stress of ling.By the finite element method, analysis of relationship between excavation depth and surfacedeformation, comparativly. Assuming the other conditions the same, analysis of the relationshipof them by changing excavation depth. These are obtained that the rulers of surface displacementand the maximum surface displacement caused by excavation depth.By the finite element method, analysis of relationship between soil strength and surfacedeformation, comparativly. Assuming the other conditions the same, analysis of the relationshipof them by changing elastic modulus of soil. These are obtained that rulers of the surfacedisplacement and the maximum surface displacement caused by soil elastic modulus.By the finite element method, analysis of relationship between tunnel diameter and surfacedeformation, comparativly. Assuming the other conditions the same, analysis of the relationshipof them by changing tunnel diameter. These are obtained that the rulers of the surfacedisplacement and the maximum surface displacement caused by tunnel diamerer.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Shield Law ( full- face excavation )
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