Abstract
This paper investigates the seismic properties of a cross transfer subway station under a horizontal earthquake wave in soft soil stratum. A 3-D simulation analysis model is established considering the dimensions and soil layers of a real structure. The HS-small model is employed to simulate the non-linear stiffness of soft soil. The dynamic responses of a single station case and a cross transfer station case are explored, followed by the direction of the input earthquake wave, the type of soil reinforcement in the overlapping area, had on the dynamic response were also analyzed. The simulation results show that the subway station has better seismic response than the single station, and soil reinforcement can increase the dynamic response of the different components in the overlapping area. As soil reinforcement stiffness increases, the dynamic response increases in both the upper and bottom stations at varying degrees. The findings from this paper provide a reference to the seismic design of cross transfer stations in similar ground.
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Abbreviations
- C:
-
Rayleigh damping matrix
- C 1 and C 2 :
-
Relaxation coefficients
- c i :
-
Cohesive force
- c soil :
-
Cohesive force of soil
- E ur ref :
-
Reference axial stiffness for unloading/reloading
- Eoed ref :
-
Reference constrained modulus
- E50 ref :
-
Reference Young’s modulus
- f 1 and f 2 :
-
Frequency
- G 0 :
-
Initial shear modulus
- K :
-
Stiffness matrix
- M :
-
Mass matrix
- R inter :
-
Interface strength parameter
- u A0i :
-
Horizontal displacement of the gauge point
- u A01 :
-
Horizontal displacement of the bottom gauge point
- u R :
-
Difference value between the horizontal displacement of all gauge points of the component and the horizontal displacement of the bottom gauge point of the component
- u m :
-
Particle displacement in the main grid
- u ff :
-
Particle displacement in the free-field element
- V p :
-
Pressure wave velocity
- V s :
-
Shear wave velocity
- α and β :
-
Rayleigh damping coefficients
- ρ :
-
Density of the materials
- ζ :
-
Damping ratio
- σ n :
-
Interface normal stress
- τ :
-
Interface shear stress
- ϕ i :
-
Friction angle of the interface
- ϕ soil :
-
Friction angle of soil
- ω 1 and ω 2 :
-
First and second target frequencies
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (NSFC) through Grant No. 51808405.
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Li, Y., Di, H., Zhou, S. et al. Seismic Analysis for Cross Transfer Subway Stations in Soft Soil Stratum. KSCE J Civ Eng 25, 1732–1745 (2021). https://doi.org/10.1007/s12205-021-0634-4
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DOI: https://doi.org/10.1007/s12205-021-0634-4