scholarly journals Seismic Response Study of Tunnels Running underneath a Subway Station in Parallel

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Fuxue Sun ◽  
Guo-bo Wang ◽  
Xiang-jun Peng ◽  
Zhou-zhou Jin ◽  
Xiao-chun Li ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Underground Structure ◽  
Internal Force ◽  
Underground Structures ◽  
Plane Model ◽  
Metro Station ◽  
Soil Response ◽  
The Impact ◽  
Station Structure ◽  
Range Of Influence

A tunnel passing below a metro station is taken as the object of our study, and a two-dimensional plane model is established to study the effects of their dynamic interaction to seismic excitation. Comparative analysis is used to obtain the influence law between the underground structures and on the soil. The results show that (1) the influence of the underground structure on the soil response is related to structure depth. The range of influence of the station structure on the surface is approximately five times the width of the station, and the surface response is obviously significant within this range. (2) The existence of the tunnel is conducive to reducing the acceleration of the column in the station. It increases the displacement difference between the stations, but the impact on the internal force of the station is not significant. (3) The influence of the station on the dynamic response of the tunnel is consistent with regard to tunnel acceleration, difference in displacement between the top and bottom of the tunnel, and internal force. The presence of the station will reduce the dynamic response of the tunnel.

The Analysis of Test of the Seismic Response for the Metro Station Structure Considering Soil-Structure Interaction

2012 ◽  
Vol 204-208 ◽  
pp. 2600-2604
Author(s):  
Ying Ming Zhou ◽  
Shu Wei Wang ◽  
Peng Wang ◽  
Li Na Yao
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Underground Structure ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Shaking Table ◽  
Underground Structures ◽  
Metro Station ◽  
General Law ◽  
Station Structure

In this paper, the subway station structure seismic response of large-scale three-dimensional shaking table model test is analysis, the model system acceleration response time, the stress response of the model structure of the schedule and structure of the surface of the earth pressure time is obtained, which has been the subway underground structure seismic response of the general law, the conclusion can provide a reliable basis and guidance for the seismic design of the MTR underground structures in the general venue.

Theoretical and Numerical Analysis on the Seismic Response of Underground Structures in Existence of Isolators

2011 ◽  
Vol 368-373 ◽  
pp. 710-714
Author(s):  
Jin Chun Liu ◽  
Yi Huan
Keyword(s):  
Dynamic Response ◽  
Analytical Procedure ◽  
Axial Loading ◽  
Seismic Loading ◽  
Underground Structures ◽  
Structural Dynamic ◽  
Metro Station ◽  
Single Degree Of Freedom ◽  
Theoretical And Numerical Analysis ◽  
Elastically Supported

In this paper, an analytical method of the beam with springs and dampers fixed at the ends was proposed based on equivalent single degree of freedom (SDOF) system and secondary Lagrange’s dynamic equations, in order to develop a new effective method to enhance the aseismic capability of underground structures. The dynamic response of elastically supported and damply supported beams subjected to both seismic loading and static axial loading was analyzed by the proposed analytical procedure. The theoretical results were validated by the numerical simulation. In order to further investigate the effects of springs and dampers fixed at the ends of the columns in nonlinear response situation, the 3D nonlinear seismic responses of the Dakai metro station structure with and without the isolators were analyzed by ABAQUS respectively. It is demonstrated that: (1) the proposed analytical procedure can predict the dynamic response of beams with elastic and damper supports subjected to both seismic loading and axial loading. (2) Setting isolators at the supports of the column could enhance the aseismic capability of the structure effectively. (3) The axial static loading induced by the gravity of the soil and structure provide the constraint on the column, and therefore could not be neglected in the structural dynamic analysis.

scholarly journals The impact of heavy object on an underground structure when falling onto the ground surface

2021 ◽  
Vol 17 (4) ◽  
pp. 425-438
Author(s):  
Oleg V. Mkrtychev ◽  
Yury V. Novozhilov ◽  
Anton Yu. Savenkov
Keyword(s):  
Nuclear Power ◽  
Rocket Engine ◽  
Underground Structure ◽  
Ground Surface ◽  
Civil Defense ◽  
Main Task ◽  
Underground Structures ◽  
Building Collapse ◽  
Protective Structures ◽  
The Impact

At the objects of space infrastructure and at nuclear power facilities there are industrial structures, the main task of which is to protect a person, equipment or machinery from emergencies such as, for example, explosions, falling of various objects, fragments. In accordance with the requirements of the Federal Law On the Protection of the Population and Territories from Natural and Technogenic Emergencies, when calculating such structures, all types of loads corresponding to their functional purpose must be taken into account. So, for structures located in the area of a possible accident and the fall of space rockets, it is necessary to calculate for the fall of the destroyed parts of the rocket engine. For nuclear power plant facilities, such accidents occur when containers and other heavy objects fall on the ground, affecting underground structures located in the ground, and for civil defense protective structures built into the basement floors of buildings, it is necessary to consider situations in which the overlying floors of a building collapse when exposed to there is an air shock wave on them. Therefore, this problem is relevant, and in this study, a finite-element method for calculating an underground structure in a non-linear dynamic setting has been developed when a large overall object collides with the ground.

Numerical Analysis of the Impact of Intensive Underground Structures on Groundwater Flow in Guangzhou (Canton), China

2014 ◽  
Vol 501-504 ◽  
pp. 1832-1845
Author(s):  
Guanyong Luo ◽  
Hong Cao ◽  
Hong Pan
Keyword(s):  
Groundwater Flow ◽  
Underground Structure ◽  
Hydraulic Head ◽  
Underground Structures ◽  
Groundwater Balance ◽  
Darcy Velocity ◽  
Groundwater Environment ◽  
Structure Density ◽  
The Impact ◽  
The City

The soil over the bedrock in the city of Guangzhou is thin, with a depth of only about 11 m. Under such conditions, excessive exploitation of the underground space is very likely to affect the groundwater environment. In this paper, the impact of intensive underground structures, which act as barriers, on the groundwater flow in Guangzhou is investigated. The emphasis is on the impacts in terms of hydraulic head, Darcy velocity and groundwater balance. The study finds that: (1) Under the current underground structure density, the impact on the hydraulic head is small, and most of the change is in the range of ±0.5 m. (2) The Darcy velocity appears to be more susceptible to being affected by the structures. (3) The barrier effect of the intensive structures increases the overflow at the foot of the hills and reduces the transmissivity of the aquifer.

Dynamic Response of Underground Structure under Vertical Earthquake Action

2011 ◽  
Vol 105-107 ◽  
pp. 1480-1483 ◽  
Author(s):  
Chao Sun ◽  
Qing Wang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Underground Structure ◽  
Soil Layer ◽  
Vertical Stress ◽  
Compressive Deformation ◽  
Bottom Plate ◽  
Underground Structures ◽  
The Earth ◽  
Earthquake Action

The research of stability of underground structures under earthquake action is one of the hot topics in Geotechnical Engineering researches .Through numerical simulation the article studies the dynamic response rules of the underground structure under vertical earthquake action. The result shows that under vertical earthquake action the vertical stress on the roof and bottom plate of underground structure and the same depth in the earth both increases, and the vertical stress on the roof and bottom plate of underground structure is much higher than that on the same depth in the earth (above two times); under vertical earthquake action the underground structure experiences greater vertical stress from time to time, and produces vertical compressive deformation, and sometimes it completely separates from the above soil layer.

scholarly journals Optimized Partition Scheme for Prefabricated Underpass with Large Cross Section

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhiyi Jin ◽  
Taiyue Qi ◽  
Xiao Liang ◽  
Bo Lei
Keyword(s):  
Cross Section ◽  
Underground Structure ◽  
Bending Moment ◽  
Internal Force ◽  
Optimal Partition ◽  
Large Cross Section ◽  
Underground Structures ◽  
Cross Sectional ◽  
Partition Scheme ◽  
Urbanization In China

With the acceleration of urbanization in China, more underpasses will be constructed in big cities to alleviate the great traffic pressure. The prefabricated and assembly construction method has been introduced to replace the traditional cast-in-place method to achieve quick construction. However, for a fully prefabricated and assembled underground structure (PAUS) with large cross section, the structure must be cut into segments in transverse direction to reduce the size and weight for easy transportation and assembly. Therefore, how to develop an optimal partition scheme is a new problem to be studied. Firstly, three preliminary partition schemes were proposed based on the internal force distribution and completed engineering practices. Then, the three schemes were compared in terms of bending moment, shear force, and axial force. The construction efficiencies were also compared with special emphasis on difference of the build period. Finally, an optimal partition scheme was determined and successfully applied in the real project. Furthermore, the construction period of this partition scheme was 1/3 of the traditional cast-in-place method. The results of the current paper can provide some design guidance to large cross-sectional underpasses and other underground structures in the partition stage.

Research on Seismic Reduction and Isolation Measures for Urban Underground Station Structure

2020 ◽  
pp. 2150012
Author(s):  
Guobo Wang ◽  
Feng Ba ◽  
Xianfeng Ma ◽  
Jielin Zhao ◽  
Yifei Yue
Keyword(s):  
Underground Structure ◽  
Reaction Force ◽  
Wave Impedance ◽  
Internal Force ◽  
Finite Element Models ◽  
Isolation Layer ◽  
Dimensional Finite Element ◽  
Reduction Effect ◽  
Underground Station ◽  
Station Structure

Based on a rectangle underground station structure, two-dimensional finite element models are established in this study to explore the effectiveness of different seismic reduction and isolation measures for underground structure, where Davidenkov model is adopted to consider the soil nonlinearity and the underground structure is considered elastic. The performances of the seismic reduction and isolation measures are evaluated by assessing the structure internal force and deformation responses. Depending on the ratio of wave impedance between the isolation layer and the structure, the isolation layers are divided into rigid and flexible types. The effects of the length and elastic modulus of rigid isolation layer as well as that of the thickness and shear modulus of flexible isolation layer are investigated. The results show that the seismic reduction effect of rigid isolation layer is better with the increase of stiffness, and the effect of flexible isolation layer is more obvious with the decrease of stiffness, which are consistent with the classical impedance theory. Furthermore, the middle column of subway station is usually the most vulnerable during seismic shakings, and one viable way to improve its seismic behavior is to reduce the column end constraints. Therefore, different column constraints consisting of swing, hinge, sliding connection and isolation bearing are considered. The numerical results suggest that among the different column end constraints considered, the sliding connection is comparatively more favorable, which can effectively limit the lateral deformation of column while imposing no horizontal reaction force.

scholarly journals Effect analysis of burial depth on seismic dynamic response of metro station structure

2020 ◽  
Vol 143 ◽  
pp. 01009
Author(s):  
Shuai Huang ◽  
Yuejun Lyu ◽  
Liwei Xiu ◽  
Zhen Xu
Keyword(s):  
Dynamic Response ◽  
Failure Mode ◽  
Shaking Table Test ◽  
Element Model ◽  
Shaking Table ◽  
Burial Depth ◽  
Metro Station ◽  
Effect Analysis ◽  
Dynamic Amplification ◽  
Station Structure

In this article, based on the nonlinear elastic-plastic finite element model for metro station, considering the structure-soil dynamic interaction, the influence laws of the burial depth on the dynamic response and failure mode of the metro station structure under near and far-field earthquakes are studied. We found that the influence of burial depth on the deformation of the metro station may be omitted after a specific value of the burial depth. With the increasing of the burial depth, the acceleration dynamic amplification factors of the metro station structure decreses. At last, indoor shaking table test for metro station was done, through which we determined the position of initial failure and the failure mode of the metro station structure under earthquake.

Three Dimensional Seismic Response Analysis of Complicated Metro Station with Shallow Depth

2014 ◽  
Vol 638-640 ◽  
pp. 1905-1910
Author(s):  
Hong Lin ◽  
Xin Pan
Keyword(s):  
Three Dimensional ◽  
Calculation Model ◽  
Shallow Depth ◽  
Response Analysis ◽  
Concept Design ◽  
Underground Structures ◽  
Metro Station ◽  
Seismic Motion ◽  
Main Station ◽  
Station Structure

Focusing on a complicated metro station with shallow depth, its three-dimensional calculation model was established, which includes not only the main station structure, but also includes the subsidiary structure such as the entrances and detailed structures such as the holes in the floor. The Davidenkov model was employed to simulate the nonlinear characteristics of the soil. The three-dimensional nonlinear seismic responses were analyzed. it can be shown from the calculation that: (1) the metro station structure can satisfy the demand under given seismic motion; (2) it is more important for structural concept design and structural measures design than the strength and deformation design for complicated underground structures.

scholarly journals Assessing the impact of vertical heat exchangers on the response of a retaining wall

2019 ◽  
Vol 92 ◽  
pp. 16001
Author(s):  
Eleonora Sailer ◽  
David M. G. Taborda ◽  
Lidija Zdravkovic ◽  
David M. Potts
Keyword(s):  
Finite Element ◽  
Heat Exchangers ◽  
Retaining Wall ◽  
Urban Environments ◽  
Underground Structures ◽  
Finite Element Program ◽  
Soil Response ◽  
Heating And Cooling ◽  
Vertical Heat ◽  
The Impact

Shallow geothermal energy systems, e.g. borehole heat exchangers or thermo-active structures, provide sustainable space heating and cooling by exchanging heat with the ground. When installed within densely built urban environments, the thermo-hydro-mechanical (THM) interactions occurring due to changes in ground temperature, such as soil deformation and development of excess pore water pressures, may affect the mechanical behaviour of adjacent underground structures. This paper investigates the effects of vertical heat exchangers installed near a deep basement by performing fully coupled THM finite element analyses using the Imperial College Finite Element Program. Different heat exchanger configurations are considered and their influence on the response of the basement wall is assessed in two-dimensional plane strain analyses, where different methods of modelling the heat sources in this type of analysis are employed to evaluate their effect on the temperature field and the non-isothermal soil response.

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