Numerical Investigation of Effective Parameters on the Tunnel - Canal Interaction (A Case Study: Tabriz Line ۲ Urban Subway)

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. 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 ۲ 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 ۶۰% effectiveness of the total investigated parameters. Face pressure is the second effective parameter of modeled ones. The share of face pressure is ۲۵% effectiveness. Canal’s wall material and its geometry are the following effective parameters respectively. Geometry changes of existed canal has ۱۵% effectiveness on the concluded numerical results. The resultants of this paper can be used in tunnelling operation of different projects.

کلیدواژه ها:

TBM ، Tunnel-canal interaction ، Numerical modeling ، Structure displacement ، FLAC۳D ، ABAQUS