Abstract
The development of underground spaces in mega-cities necessitates understanding the interaction among various underground structures. Soil acts as the fundamental medium in bearing and transmitting forces during the construction of these structures. In shield tunnels, the deformation of adjacent soil is a primary concern. or underground structures with piled raft foundations, this deformation directly impacts the foundation’s bearing capacity and causes differential deformation. This consideration becomes especially crucial for large-diameter shield tunnels when intersecting with piled raft foundations. To address this issue, the study examines a case of a mega-diameter shield tunnel intersects a piled raft foundation, which is the built for an underground railway station. The research focuses on soil deformation between the tunnel and the structure during construction, analyzing the variation of pile neutral points across the foundation based on soil deformation. A method is proposed to rapidly predict incremental negative frictional resistance of piles due to tunnel excavation, guided by soil deformation. The study clarifies the specific range of tunnel excavation’s influence on pile-bearing capacity, offering practical insights and potential theoretical guidance for similar future projects.
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Abbreviations
- G soil :
-
Average shear Modulus of soil layers
- i(z):
-
The function representing the width of the settlement trough that varies with depth
- k n :
-
The normal stiffness of the pile-soil interface
- k s :
-
The shear stiffness of the pile-soil interface
- R :
-
The excavation radius of the tunnel
- r 0 :
-
Radius of piles
- R int :
-
Pile-soil interface strength reduction factors
- S(x,z):
-
Soil settlement values at arbitrary locations above a twin-tunnel structure
- S max :
-
The maximum settlement value on the settlement curve
- V loss :
-
The rate of soil loss per unit area caused by tunnel excavation
- V L :
-
The volume of soil loss per unit area resulting from tunnel excavation
- Δτ (z) :
-
The distribution of incremental negative skin friction forces resulting from tunnel excavation
- Δω :
-
The relative displacement between the pile and the soil
- μ :
-
Considering the reinforcement effect of pile foundations, the modified impact of increased soil elastic modulus on soil settlement
- v :
-
Poisson’s ratio of soil layers
- ω p :
-
The displacement generated by a pile under the influence of fictional resistance
- ξ :
-
Shape factor of piles
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Li, Y., Yao, A., Gao, X. et al. Rapid Prediction of Pile Friction Resistance Based on Soil Deformation Law Caused by a Super Large Diameter Tunnel: A Case Study. KSCE J Civ Eng (2024). https://doi.org/10.1007/s12205-024-1771-3
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DOI: https://doi.org/10.1007/s12205-024-1771-3