Comparison of Dynamic Characteristics between Small and Super-Large Diameter Cross-River Twin Tunnels under Train Vibration
Train vibration from closely aligned adjacent tunnels could cause safety concerns, especially given the soaring size of the tunnel diameter. This paper established a two-dimensional discrete element model (DEM) of small (<i>d</i> = 6.2 m) and super-large (<i>D</i> = 15.2 m) d...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-08-01
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| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/11/16/7577 |
| Summary: | Train vibration from closely aligned adjacent tunnels could cause safety concerns, especially given the soaring size of the tunnel diameter. This paper established a two-dimensional discrete element model (DEM) of small (<i>d</i> = 6.2 m) and super-large (<i>D</i> = 15.2 m) diameter cross-river twin tunnels and discussed the dynamic characteristics of adjacent tunnels during the vibration of a train that runs through the tunnel at a speed of 120 km/h. Results in the <i>D</i> tunnel showed that the horizontal walls have the same horizontal displacement (<i>D</i><sub>H</sub>) and the vertical walls have the same vertical displacement (<i>D</i><sub>V</sub>). The stress state of the surroundings of the <i>D</i> tunnel is the decisive factor for <i>D</i><sub>H</sub>, and the distance from the vibration point to the measurement point is the decisive factor for <i>D</i><sub>V</sub>. Results in the comparison of the <i>d</i> and <i>D</i> tunnels showed that the <i>D</i> tunnel is more stable than the <i>d</i> tunnel with respect to two aspects: the time the tunnel reaches the equilibrium state and the vibration amplitude of the structure’s dynamic and static responses. The dynamic characteristic of the <i>d</i> and <i>D</i> tunnel is significantly different. This research is expected to guide the design and construction of large diameter twin tunnels. |
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| ISSN: | 2076-3417 |