Analysis of the Compressibility Effect of Overburden in a Deep Shield Tunnel Based on the Effect of the Pressure Arch

With the continuous improvement of the planning system for urban subway construction, shield tunnels are being more frequently constructed, and thus, the floating problem of shield tunnels in construction has been paid increasingly more attention. In view of this, in this paper, with the combination...

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Bibliographic Details
Published in:Advances in civil engineering 2019-01, Vol.2019 (2019), p.1-12
Main Authors: He, Biao, Liang, Xing, Ye, Fei, Han, Xin, Lei, Ping, Duan, Zhi-jun
Format: Article
Language:English
Subjects:
Arches
Civil engineering
Compressibility effects
Computer simulation
Construction
Continuous improvement
Displacement
Engineering
Floating structures
Force distribution
Mathematical problems
Mindlin plates
Perturbation methods
Plastic zones
Pressure effects
R&D
Research & development
Segments
Soil compressibility
Soil investigations
Soil properties
Stress concentration
Subway construction
Subway tunnels
Tunnel construction
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Summary:With the continuous improvement of the planning system for urban subway construction, shield tunnels are being more frequently constructed, and thus, the floating problem of shield tunnels in construction has been paid increasingly more attention. In view of this, in this paper, with the combination of numerical simulation and theoretical analysis, the problem of floating segments compressing the overburden in the deep shield tunnel is discussed. The influential factors of the pressure arch effect are analysed using numerical simulation, the compressive displacement of soil in the plastic zone is investigated in a focused manner based on the pressure arch effect, and the problem of floating segments that the Mindlin solution is applied to under the actions of distributed force and concentrated force is solved. The results show the following: (1) the displacement of the segment is composed of the shield tail gap, the compressive displacement of the soil, and the translational displacement of the soil; (2) the intensity of the pressure arch effect is interactively influenced by the thickness-diameter ratio and the soil properties; (3) the compressive displacement of the soil mass accounts for a larger proportion of floating segment-induced displacements; and (4) the perturbation influence calculation formula of the surrounding strata and the building structure is obtained based on the Mindlin solution.
ISSN:1687-8086
1687-8094
DOI:10.1155/2019/7613046