A Multi-Layer Blowout Model for the Tunneling Face Stability Analysis

The stability of the tunnel face during tunneling is one of the major criteria for the design and construction of the tunnel. Collapse and blowout are two modes of tunnel face failure during the excavation. The cover-to-diameter ratio is one of the main parameters controlling these failure modes. Se...

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Bibliographic Details
Published in:Buildings (Basel) 2023-06, Vol.13 (6), p.1362
Main Authors: Vu, Minh-Ngan, Vu, Minh-Ngoc, Pham, Duc-Tho, Nguyen-Sy, Tuan, Nguyen, Quoc-Bao, Dang, Viet-Duc
Format: Article
Language:English
Subjects:
analytical model
blowout
Collapse
cover-to-diameter ratio
Design optimization
Disclaimers
Drilling & boring machinery
Equilibrium
Equilibrium analysis
Exact solutions
Excavation
Failure modes
Layered soils
Mathematical models
multi-layered soil
Multilayers
shallow tunnel
Soil layers
Stability analysis
Subways
TBM
Tunneling
Tunnels
Water table
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Summary:The stability of the tunnel face during tunneling is one of the major criteria for the design and construction of the tunnel. Collapse and blowout are two modes of tunnel face failure during the excavation. The cover-to-diameter ratio is one of the main parameters controlling these failure modes. Several analytical solutions have been proposed to estimate the range of support pressure applied on the tunnel face to avoid both the collapse and the blowout. However, most of those models deal with homogeneous soils. This paper aims at proposing an analytical model to predict the blowout of the tunneling face of a tunnel in multi-layered soils. The derivation is based on a limit equilibrium analysis, which considers the water tCiable. The proposed model is validated against the real blowout data reported from the tunneling in the Second Heinenoord Tunnel project in the Netherlands. Then, the maximum support pressure exerted on the tunneling face is predicted as a function of the cover-to-diameter ratio, the tunnel diameter, and the water table level for five representative soils. Finally, the model is applied to an underground segment of the Hanoi Metro Line 3 project (in Vietnam) to show the role of the multi-layer aspect.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings13061362