Location
Chicago, Illinois
Date
02 May 2013, 7:00 pm - 8:30 pm
Abstract
The development of cities requires the use of underground area for the construction of transportation infrastructure facilities. Construction of twin tunnels or new tunnel close to the existing ones may be done horizontally, vertically or in inclined manner. In the case of horizontal tunnels the distribution of tunnel load will be more in lateral direction. Since cities are densely concentrated with tall structures, laterally distributed loads will induce settlement in the foundation of the structures. For a particular orientation of tunnels, the soil movement and internal forces in the lining will be affected by both the relative position of tunnels and the construction procedure. Hence the study on influence of these factors on the tunnel design gains importance. In the present study a numerical analysis has been carried out to evaluate the relative position of the twin tunnels in three directions in layered soil. The direction considered are horizontal alignment, vertical alignment and inclined alignment. Model twin tunnels have been constructed using numerical code Plaxis based on finite element analysis. Settlement analysis has been carried out for the different loading conditions on the tunnels in the selected directions. The results are presented in the form of surface settlement, bending moment and stresses in the lining of the tunnels for different orientation of tunnels. The construction of upper tunnel at first leads to both higher settlement and bending moment. The highest soil settlement is obtained for vertical aligned tunnels, while horizontal aligned tunnels cause the lowest settlement.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
7th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2013 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Channabasavaraj, W. and Visvanath, B., "Influence of Relative Position of the Tunnels: A Numerical Study on Twin Tunnels" (2013). International Conference on Case Histories in Geotechnical Engineering. 2.
https://scholarsmine.mst.edu/icchge/7icchge/session05/2
Influence of Relative Position of the Tunnels: A Numerical Study on Twin Tunnels
Chicago, Illinois
The development of cities requires the use of underground area for the construction of transportation infrastructure facilities. Construction of twin tunnels or new tunnel close to the existing ones may be done horizontally, vertically or in inclined manner. In the case of horizontal tunnels the distribution of tunnel load will be more in lateral direction. Since cities are densely concentrated with tall structures, laterally distributed loads will induce settlement in the foundation of the structures. For a particular orientation of tunnels, the soil movement and internal forces in the lining will be affected by both the relative position of tunnels and the construction procedure. Hence the study on influence of these factors on the tunnel design gains importance. In the present study a numerical analysis has been carried out to evaluate the relative position of the twin tunnels in three directions in layered soil. The direction considered are horizontal alignment, vertical alignment and inclined alignment. Model twin tunnels have been constructed using numerical code Plaxis based on finite element analysis. Settlement analysis has been carried out for the different loading conditions on the tunnels in the selected directions. The results are presented in the form of surface settlement, bending moment and stresses in the lining of the tunnels for different orientation of tunnels. The construction of upper tunnel at first leads to both higher settlement and bending moment. The highest soil settlement is obtained for vertical aligned tunnels, while horizontal aligned tunnels cause the lowest settlement.
