Grouting Reinforcement Measures for a Shield Tunnel Undercrossing Foundation of a Pile Group
Publication: International Journal of Geomechanics
Volume 24, Issue 10
Abstract
Aiming at the condition of shield tunnel undercrossing the foundation of a pile group directly, using the settlement and inclination of the pile caps as the evaluation index, the reinforcing effect of the pregrouting of the soil around the pile foundation, the deep hole grouting behind the tunnel segment, and the combination of the two reinforcement methods are analyzed through three-dimensional numerical simulation. A reasonable reinforcement scheme is found and applied to practical engineering. The results show that for the pregrouting reinforcement of the soil around the pile, the optimal reinforcement scheme is to extend 0.5 m around the pile cap in the plane and vertically from the surroundings of the pile cap to 1/3 of the pile length below the bottom of the cap. When deep hole grouting reinforcement is adopted, larger reinforcement range and a certain range of radial reinforcement radius of tunnel section will result in a better effect of reinforcement. The combination of the two schemes is better than the single use of one. The practical application results show that the combined reinforcement scheme can effectively control the influence of shield tunnel excavation on the pile foundation of an elevated waiting hall.
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Data Availability Statement
All data and models presented in this study are available upon request from the corresponding author.
Notation
The following symbols are used in this paper:
- Ap
- cross-sectional area of the pile;
- Ep
- elastic modulus of pile;
- Es
- elastic modulus of soil at pile tip;
- Kn
- normal stiffness modulus;
- Kt
- shear stiffness modulus;
- L
- length of the pile;
- P
- load;
- Qs
- final shear force;
- qk
- standard value of ultimate lateral friction resistance of pile;
- Sm
- settlement of single pile under load;
- u
- perimeter of the pile; and
- Δ
- distribution coefficient of pile lateral friction resistance.
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 24 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 13, 2023
Accepted: Apr 4, 2024
Published online: Jul 19, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 19, 2024
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