Numerical Investigation of Effective Parameters on the Tunnel - Canal Interaction (A Case Study: Tabriz Line 2 Urban Subway)

Document Type : Research Article

Authors

1 Dept. of Civil Engineering, Sahand University of Technology, Tabriz, Iran

2 Dept. of Mining Engineering, Amirkabir University of Technology, Tehran, Iran

3 Dept. of Mining Engineering, Sahand University of Technology, Tabriz, Iran

4 Dept. of Civil Engineering, Islamic Azad University, Bonab, Iran

Abstract

Tunneling in urban areas is more prone to vulnerable problems that may threaten life safety or cause urban infrastructure disasters. Tunneling parameters such as face pressure, are the important controlling aspects that can avoid disasters or cause some, like high amounts of settlements or different collapse forms. Tunnel line intersection with other underground spaces like pre-bored tunnels, shallow canals or deep underground structures can cause high amounts of stresses and disasters on them which will conclude in high amounts of displacements, fractures and/or failure.

Numerical modelling of tunnelling process effects on the existing underground structures is a valuable method of investigating the stability of the important structures. Since numerical models are accessible, studying effective parameters of tunnelling process on the existing structure can be considered. In this paper, the effective parameters on the stability of an intersected canal are numerically investigated. Face pressure, canal cross-section geometry, canal’s wall material and canal – tunnel distance are the main parameters that have been investigated in this study. As a case of study, Tabriz line 2 urban subway intersection with Shah-Chalaby canal has been investigated. Numerical models result that tunnel – canal distance has the maximum effect on the stability of canal structure with 60% effectiveness of the total investigated parameters. In-order to keep canal’s stability, controlling the distance parameter as the most important one should be done. Face pressure is the second effective parameter of modeled ones. The share of face pressure is 25% effectiveness. Canal’s wall material and its geometry are the following effective parameters respectively. These two have not been examined thoroughly or sufficiently in the last decades. Geometry changes of existed canal has 15% effectiveness on the concluded numerical results. The resultants of this paper can be used in tunnelling operation of different projects.

Keywords

Main Subjects

References

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History

  • Receive Date: 13 April 2025
  • Revise Date: 11 May 2025
  • Accept Date: 27 May 2025

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