Application of Biot’s Poroelasticity to Seismic Analysis of Subway Stations in a Saturated Poroelastic Half-space: Effects of Viscous Coupling

2020 ◽  
pp. 1-22
Author(s):  
Jun Zhu ◽  
Jianwen Liang ◽  
Zhenning Ba
Keyword(s):  
Half Space ◽  
Seismic Analysis ◽  
Viscous Coupling ◽  
Subway Stations ◽  
Space Effects

Seismic Analysis of Typical Cut-and-Cover Subway Stations in Beijing

2011 ◽  
Vol 90-93 ◽  
pp. 2200-2206
Author(s):  
Jing Bo Liu ◽  
Dong Dong Zhao ◽  
Wen Hui Wang
Keyword(s):  
Peak Ground Acceleration ◽  
Seismic Analysis ◽  
Relative Displacement ◽  
High Ratio ◽  
Underground Structures ◽  
Ground Acceleration ◽  
Analysis And Design ◽  
Side Walls ◽  
Subway Stations ◽  
Lower Ratio

To obtain the seismic responses of typical subway stations in Beijing, a nonlinear analysis was conducted using a pushover method for seismic analysis and design of underground structures. The analysis mainly focuses on stress in columns and side walls and relative displacement between top and bottom slabs under 3 different levels of PGA (peak ground acceleration). From the analysis, the column shows good ductility due to its high ratio of reinforcement, and it has a good performance under strong motions. Compared with columns, side walls suffer from brittle failure and lose bearing capacity prior to column for its lower ratio of reinforcement. The calculated displacement indicates that the relative displacement between top and bottom slabs is linear proportional to peak ground relative displacement (PGRD). And compared with peak ground acceleration (PGA), PGRD is a more reliable design parameter of ground motion for underground structures. And the typical subway stations in Beijng can withstand the earthquake with design PGA up to 0.2 g.

Seismic Analysis for Cross Transfer Subway Stations in Soft Soil Stratum

2021 ◽  
Vol 25 (5) ◽  
pp. 1732-1745
Author(s):  
Yitao Li ◽  
Honggui Di ◽  
Shunhua Zhou ◽  
Quanmei Gong
Keyword(s):  
Seismic Analysis ◽  
Soft Soil ◽  
Soil Stratum ◽  
Subway Stations

Investigating the Effect of Depth and Impedance of Foundation Rock in Seismic Analysis of Gravity Dams

2014 ◽  
Vol 5 (2) ◽  
pp. 1-18
Author(s):  
Sharad Joshi ◽  
Ishwer Datt Gupta ◽  
Lalitha R. Pattanur ◽  
Pranesh B. Murnal
Keyword(s):  
Half Space ◽  
Seismic Analysis ◽  
Free Field ◽  
Time History ◽  
Gravity Dams ◽  
Ground Acceleration ◽  
Rock Interaction ◽  
Foundation Block ◽  
Substructure Approach ◽  
Foundation Rock

The inhomogenieties of the foundation can be modeled explicitly in standard FEM procedure, however, the results vary significantly with the extent of foundation block modeled and mechanism of applying the input earthquake excitation. The substructure approach provides mathematically exact solution but assumes average properties for the entire foundation as viscoelastic half space. This paper has carried out detailed investigations with varying impedance contrasts and different size of foundation block to show that the results, with suitably deconvoluted free-field ground acceleration time-history applied at the base of foundation block in the FEM approach, are in good agreement with the substructure approach. However, the other variants of the FEM approach may lead to erroneous and overestimated stresses in the dam body. As the foundation of gravity dams can generally be approximated as an equivalent homogeneous half-space, the more accurate and efficient substructure approach can be used to model the dam-foundation rock interaction (SSI) effects in most practical situations.

On a technique for deriving explicit transfer matrices of orthotropic layers

2015 ◽  
Vol 37 (4) ◽  
pp. 303-315 ◽  
Author(s):  
Pham Chi Vinh ◽  
Nguyen Thi Khanh Linh ◽  
Vu Thi Ngoc Anh
Keyword(s):  
Wave Propagation ◽  
Explicit Form ◽  
Half Space ◽  
Transfer Matrix ◽  
Rayleigh Waves ◽  
Secular Equation ◽  
Transfer Matrices ◽  
Orthotropic Layer ◽  
Wave Propagation Problem ◽  
Arbitrary Thickness

This paper presents  a technique by which the transfer matrix in explicit form of an orthotropic layer can be easily obtained. This transfer matrix is applicable for both the wave propagation problem and the reflection/transmission problem. The obtained transfer matrix is then employed to derive the explicit secular equation of Rayleigh waves propagating in an orthotropic half-space coated by an orthotropic layer of arbitrary thickness.

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