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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2024, Vol. 18 Issue (5) : 760-775    https://doi.org/10.1007/s11709-024-1069-z
Seismic responses of an intensively constructed metro station-passageway-shaft structure system
Ruohan LI1,2, Yong YUAN3(), Hong CHEN4, Xinxing LI4, Emilio BILOTTA2
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2. Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Naples 80125, Italy
3. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
4. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China
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Abstract

Intensive construction methods offer benefits for metro station development, yet they present challenges for seismic design due to the spatially asymmetric configuration of passageway-shaft structures. In this study, a detailed numerical model of a station-passageway-shaft structure system built using intensive construction methods was developed and the deformation and damage modes under seismic loadings were analyzed. The results indicate that inconsistent deformation between the shaft and the station generates interaction through the connecting passageway, leading to damage near the opening of the station structure and both ends of the connecting passageway Damage is more severe under longitudinal excitation. Compared with the opening plan that spans four segments, the opening plan that spans five segments exacerbates the overall degree of damage to the structure system. Under transverse excitation, the presence of interior structures intensifies the damage to the station and connecting passageway, while with such internal structure in place the impact is relatively minor under longitudinal excitation. Reinforcement with steel segments near the station opening can appreciably attenuate the damage. In contrast, introducing flexible joints at both ends of the connecting passageway intensifies the damage. Hence, reinforcement using steel segments emerges as an optimal seismic mitigation strategy.

Keywords earthquake      intensive construction      metro station      numerical simulation     
Corresponding Author(s): Yong YUAN   
Just Accepted Date: 29 May 2024   Online First Date: 18 June 2024    Issue Date: 26 June 2024
 Cite this article:   
Ruohan LI,Yong YUAN,Hong CHEN, et al. Seismic responses of an intensively constructed metro station-passageway-shaft structure system[J]. Front. Struct. Civ. Eng., 2024, 18(5): 760-775.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-024-1069-z
https://academic.hep.com.cn/fsce/EN/Y2024/V18/I5/760
Fig.1  Schematic of numerical model: (a) site; (b) structures; (c) lateral cross section; (d) segmental tunnel of the station (portion).
NumberSoil typeThickness (m)Density (kg/m3)Shear wave velocity (m/s)
1artificial filling1.717.300127.000
2powdered clay2.818.500126.000
3silty powdered clay3.617.100125.000
4clayey powdered soil3.718.400125.000
5silty powdered clay3.717.100124.000
6silty clay4.616.600147.000
7clay4.717.400192.000
8powdered clay4.719.400235.000
9sandy chalky soil4.318.900255.000
10powdered clay with chalky sand4.318.300373.000
11powdered sand4.319.600410.000
12powder sand with medium coarse sand4.419.800433.000
13medium sand with powder fine sand4.419.600436.000
14medium sand with powder fine sand4.419.600447.000
15powdered clay4.519.200466.000
Tab.1  Material parameters of soil layers
Density (kg/m3)Elastic modulus (GPa)Poisson’s ratioDilation angle (° )EccentricityKcStress ratioTensile yield stress (MPa)Compressive yield stress (MPa)
2500300.2300.10.6671.161.2610.8
Tab.2  Material parameters of concrete
Fig.2  Input motions: (a) accelerogram; (b) Fourier spectrum of 1-Hz Ricker wavelet.
Fig.3  Dynamic response characteristics under transverse excitation: (a) overall deformation; (b) cross-sectional deformation; (c) squeeze deformation compare with structure without opening (deformation scale factor: 500).
Fig.4  Dynamic response characteristics under longitudinal excitation: (a) overall deformation; (b) deformation in horizontal plane; (c) racking deformation of opening (deformation scale factor: 500).
Fig.5  Tensile damage of structure system under transverse excitation: (a) cross section; (b) longitudinal.
Fig.6  Tensile damage of single segment tunnel under transverse excitation: (a) cross section; (b) longitudinal layout.
Fig.7  Tensile damage of structure system under longitudinal excitation: (a) cross section; (b) longitudinal.
Damage levelDescription of damage statesdt
Negligible damageinvisible cracks without need of repair0 < dt < 0.34
Slight damageminor cracks of tunnel lining, which requires only cosmetic repair0.34 ≤ dt < 0.72
Moderate damagemoderate cracking of tunnel lining, and repair requires interruption of tunnel operation0.72 ≤ dt < 0.84
Severe damageserious water leakage. tunnel structure can be repaired but maybe extremely expensivedt ≥ 0.84
Tab.3  Damage level of concrete (modified based on Zhong et al. [28])
Fig.8  Tensile damage volume of structure system: (a) transverse excitation; (b) longitudinal excitation.
Fig.9  Different opening plans: (a) original plan; (b) Plan B.
Fig.10  Tensile damage of structure system using Plan B under transverse excitation: (a) cross section; (b) longitudinal.
Fig.11  Tensile damage of structure system using Plan B under longitudinal excitation: (a) cross section; (b) longitudinal.
Fig.12  Comparison of tensile of damage volume of structure system with different opening plans: (a) transverse excitation; (b) longitudinal excitation.
Fig.13  Interior structure: (a) cross section; (b) three-dimensional sketch.
Fig.14  Tensile damage of structure system with interior structure under transverse excitation: (a) cross section; (b) longitudinal.
Fig.15  Tensile damage of structure system with interior structure under longitudinal excitation: (a) cross section; (b) longitudinal.
Fig.16  Comparison of tensile of damage volume of structure system with interior structure: (a) transverse excitation; (b) longitudinal excitation.
Density (kg/m3)Elastic modulus (GPa)Poisson’s ratioYield stress (GPa)
7850800.30.5
Tab.4  Material parameters of steel
Fig.17  Range of steel shield segment reinforcement.
Fig.18  Tensile damage of structure system with steel shield segment reinforcement under transverse excitation: (a) cross section; (b) longitudinal.
Fig.19  Tensile damage of structure system with steel shield segment reinforcement under longitudinal excitation: (a) cross section; (b) longitudinal.
Fig.20  Comparison of tensile of damage volume of structure system using steel segment: (a) transverse excitation; (b) longitudinal excitation.
Density (kg/m3)Elastic modulus (MPa)Poisson’s ratio
20001000.35
Tab.5  Material parameters of flexible joints
Fig.21  Schematic of flexible joint set-up.
Fig.22  Tensile damage of structure system with flexible joint under transverse excitation: (a) cross section; (b) longitudinal.
Fig.23  Tensile damage of structure system with flexible joint under longitudinal excitation: (a) cross section; (b) longitudinal.
Fig.24  Comparison of tensile of damage volume of structure system with flexible joint: (a) transverse excitation; (b) longitudinal excitation.
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