scholarly journals Effects of Burial Depth on the Seismic Response of Subway Station Structure Embedded in Saturated Soft Soil

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Xuelei Cheng ◽  
Zongguang Sun
Keyword(s):  
Seismic Response ◽  
Numerical Models ◽  
Soft Soil ◽  
Pressure Ratio ◽  
Bending Moment ◽  
Subway Station ◽  
Burial Depth ◽  
Two Phase ◽  
Crucial Effect ◽  
Station Structure

For the aim to study the effects of burial depth on seismic response in the subway station’s structure embedded in saturated soft soil, on the basis of the OpenSEES program, numerical models with four cases of burial depth for the nonlinear interaction system including subway station’s structure and saturated soft soil are developed with the u-p formulations of Biot’s theory as it seeks to describe the saturated two-phase media. The effects of burial depth on the seismic response and the failure pattern of the subway station structure are investigated. The numerical results show that (1) the burial depth has a significant effect on the nonuniform uplift of station’s structure due to the movement of soil from far field towards baseplate; (2) with the increase of burial depth, the inertial effect of overlaying soil of the subway station structure becomes more obvious, and the peak zone of the pore pressure ratio contracts from the outer area to the baseplate bottom with decreasing amplitude; (3) the dynamic index R decreases with the increasing burial depth of the station’s structure; and (4) in terms of the middle column, the burial depth of the station’s structure has the most crucial effect on the additional dynamic shear force and bending moment at the top end.

Seismic Response Analysis of Subway Station in Tianjin Soft Soil Area

2012 ◽  
Vol 166-169 ◽  
pp. 2171-2176
Author(s):  
De Jian Yang ◽  
Ya Li
Keyword(s):  
Seismic Response ◽  
Soil Structure ◽  
Soft Soil ◽  
Weak Links ◽  
Subway Station ◽  
Response Analysis ◽  
Acceleration Time Histories ◽  
Time Histories ◽  
Method Model ◽  
Station Structure

In connection with the practical project of Kunminglu station of Tianjin subway Line 3 in soft soil sites, the finite element method model based on soil-structure interaction was established by using ANSYS program. Additionally, this paper analysed the static calculation and the dynamic interaction system of underground soil-structure, obtained the acceleration time histories of seismic response, and concluded that what are mechanical characteristics of subway station structure under the static and dynamic load. Possible damage to subway station brought about seismic response and seismic weak links of subway station structure under the action of horizontal earthquake is analyzed.

Seismic response of subway station in soft soil: Shaking table testing versus numerical analysis

2020 ◽  
Vol 100 ◽  
pp. 103389 ◽  
Author(s):  
Weifeng Wu ◽  
Shiping Ge ◽  
Yong Yuan ◽  
Wenqi Ding ◽  
Ioannis Anastasopoulos
Keyword(s):  
Numerical Analysis ◽  
Seismic Response ◽  
Soft Soil ◽  
Shaking Table ◽  
Subway Station ◽  
Shaking Table Testing

scholarly journals Shaking Table Test and Numerical Verification for Free Ground Seismic Response of Saturated Soft Soil

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Xuelei Cheng ◽  
Chunyi Cui ◽  
Zongguang Sun ◽  
Jinhong Xia ◽  
Guangbing Wang
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Effective Stress ◽  
Shaking Table Test ◽  
Soft Soil ◽  
Pressure Ratio ◽  
Free Field ◽  
Shaking Table ◽  
Response Characteristics ◽  
Fully Coupled

This paper investigates shaking table test (1g) and numerical simulation (fully coupled) of vertically propagating shear waves for saturated soft free field. A large-scale shaking table model test was performed to study seismic response characteristics of saturated soft soil free field. According to test results of seismic response features of free field system in saturated soft soil, the free field nonlinearity fully coupled numerical model of dynamical effective stress of saturated soft soil was established using OpenSEES, based on the u-p formulations of dynamic consolidation equation as well as effective stress solution method for saturated two-phase media. The numerical simulation of the free field seismic response of saturated soft soil under various test conditions was performed and the calculated results were compared with the shaking table test results. The results show the following. (1) With the increase of input ground motion intensity, the characteristic frequency of the saturated soft free ground decreases and the damping ratio increases gradually. (2) The saturated soft soil ground has short period filtering and long period amplification effect on the horizontal input seismic loads. The failure foundation takes on the isolation and shock absorption under strong ground motions. (3) The peak pore pressure ratio of the saturated soft soil ground is located in the shallow buried soil layer, and with the increase of the input ground motion intensity, the advantage of dynamic pore pressure ratio in this area is gradually weakened. (4) The numerical simulation results are consistent with the results of the shaking table test. This fully coupled effective stress numerical method can reasonably simulate the seismic response characteristics of free field in saturated soft soil, which lay the foundation for other more complex parameter extrapolation models of saturated soft soil sites. This research can provide the necessary technical experience for experimental study on non-free field.

Design of a shaking table test box for a subway station structure in soft soil

2007 ◽  
Vol 1 (2) ◽  
pp. 194-197 ◽  
Author(s):  
Linde Yang ◽  
Qianqian Ji ◽  
Yonglai Zheng ◽  
Chao Yang ◽  
Dongliang Zhang
Keyword(s):  
Shaking Table Test ◽  
Soft Soil ◽  
Shaking Table ◽  
Subway Station ◽  
Station Structure

Analysis of Seismic Response Influence of High Rise Building Nearby Subway Station in Soft Site

2012 ◽  
Vol 166-169 ◽  
pp. 2105-2111
Author(s):  
Hui Long ◽  
Guo Xing Chen ◽  
Hai Yang Zhuang
Keyword(s):  
Seismic Response ◽  
Shear Force ◽  
Soft Soil ◽  
Horizontal Displacement ◽  
Element Model ◽  
Subway Station ◽  
High Rise ◽  
High Rise Building ◽  
Dimensional Finite Element ◽  
The Moment

A two-dimensional finite element model for soil-subway station- high rise building was created based on the representative soft soil site along the Nanjing subway to study the nonlinear dynamic interaction among three parts. The influence of two-layer and three-stride island-type subway station was explored on the seismic response of nearby high rise building. The results showed that the natural frequency of high rise building was reduced apparently because of the existence of soft soil. The displacement angle between the layers of high rise buildings and right swing relative horizontal displacement amplitude between top and bottom was increased when the subway station was located at the left of the high rise building. In the same time, the shear force of the beam end and the moment amplitude on the middle span of the first and second floor of high rise building, the shear force of the column end on the fist layer, the shear and moment amplitude of the middle column end and right side column end on underground layer were all increased, and the increase proportion is even up to 30% on certain areas, which could weaken the seismic performance of high rise building.

scholarly journals Effect Mechanism of Connection Joints in Fabricated Station Structures

2021 ◽  
Vol 11 (24) ◽  
pp. 11927
Author(s):  
Huafei He ◽  
Zhaoping Li
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Joint Distribution ◽  
Damage Index ◽  
Time History ◽  
Subway Station ◽  
Bottom Plate ◽  
Relative Deformation ◽  
Damage Degree ◽  
Station Structure

The seismic response of a fabricated subway station is a complex structural connection problem that depends on the mechanical properties of the joints. In order to obtain the optimal joint distribution of a fabricated station structure under earthquake action, three finite element models of a single ring structure of fabricated subway stations assembled with seven, five, and four prefabricated components were proposed. Seismic wave characteristics, peak acceleration, and coupled horizontal and vertical seismic components were considered to study the seismic response of the fabricated subway station structure with different forms of the joint distribution. The dynamic time history method was used to analyze the seismic response in three aspects: structure plastic strain, interlayer relative deformation, and internal force. The damage indexes and residual strength indexes of the joints were offered based on the concrete damage index to evaluate the joints’ damage degree. The results showed that the joints of the vault or bottom plate had little influence on the seismic response of the fabricated station structure. The sidewall joints had the obvious seismic response and the most severe damage under horizontal ground motion or coupled ground motion, which were the weak joints of the fabricated station structure. The existence of vertical ground motion aggravated the damage degree of sidewall joints, making the damage occurrence time of sidewall joints earlier and the damage end time extended. On the premise of meeting the mechanical load and site requirements, an assembly scheme with fewer prefabricated components can be selected.

scholarly journals Effect of soil-rock interface position on seismic response of subway station structure

2022 ◽  
Vol 119 ◽  
pp. 104255
Author(s):  
Zhidong Gao ◽  
Mi Zhao ◽  
Jingqi Huang ◽  
Weiwei Wang ◽  
Xiuli Du
Keyword(s):  
Seismic Response ◽  
Subway Station ◽  
Interface Position ◽  
Rock Interface ◽  
Station Structure
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