Seismic Response Analysis for Shallow Tunnel in Different Earthquake Intensity

2013 ◽  
Vol 680 ◽  
pp. 161-165 ◽  
Author(s):  
Li Lin ◽  
He Chuan ◽  
Zhang Jing ◽  
Geng Ping
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Model Test ◽  
Internal Force ◽  
Shaking Table ◽  
Response Analysis ◽  
Shallow Tunnel ◽  
Earthquake Intensity ◽  
Study Results ◽  
Table Model

Base on the large-shaking table model test，studies on the seismic response characters of shallow tunnel in different earthquake intensity are made by mainly using numerical simulation. The results indicate that there is a good agreement between the model test and numerical simulation. the different earthquake intensity has great effects on the seismic response characters, The distribution of the lining cross-section’s internal force is oval-shaped and the value which in conjugate 45° direction is greater than crown and bottom of arch. Moreover, the internal forces vary from earthquake intensity in the same direction. It is great to recognize the seismic response characters of shallow tunnels through the study results and it provides reference for the similar projects.

Shaking Table Model Test of Loess Tunnel Structure under Rainfall

2021 ◽  
Author(s):  
Xinhai Zhou ◽  
Xuansheng Cheng ◽  
Lei Qi ◽  
Ping Wang ◽  
Shaofeng Chai ◽  
...  
Keyword(s):  
Model Test ◽  
Shaking Table ◽  
Tunnel Structure ◽  
Table Model ◽  
Shaking Table Model Test

scholarly journals A Numerical Investigation on Scaling Rolling Friction Effects in Shaking Table Model Tests

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Shanshan Li ◽  
Biao Wei ◽  
Chengjun Zuo ◽  
Xuhui He
Keyword(s):  
Friction Force ◽  
Rolling Friction ◽  
Model Tests ◽  
Shaking Table ◽  
Prototype Model ◽  
Viscous Damping ◽  
Seismic Responses ◽  
Earthquake Intensity ◽  
Isolation System ◽  
Table Model

Friction action is a damping mechanism used in civil structures. It often works together with traditional viscous damping. The rolling friction action is nonlinear, and its scaling process in shaking table model tests is suspect, especially in cases of working in combination with traditional viscous dampers. To solve the problem, a numerical model of simplified viscous damper-Coulomb friction base isolation system was scaled. The comparison between the scaled and the prototype model results showed two important factors that influence the scaling of rolling friction action. One factor is the unscaled gravity acceleration, which results in an adverse friction force and seismic responses of scaled models. These adverse seismic responses can be improved by changing the friction coefficient to correct for the abovementioned adverse friction force in the dynamic equation. Another factor is the friction variation in space, causing adverse scaled seismic responses. These adverse seismic responses can be improved by moving the variable friction positions along the scaled size of contact surface. The influence of the above two factors can be weakened by increasing the traditional viscous damping component and the earthquake intensity.

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