Mohammad Javad Vahdatirad, Hadi Ghodrat, Sara Firouzian, and Amin Barari

pp. 145 - 152

Abstract

The tunnel of the Tabriz urban railway line 2 (TURL2), Iran, will pass through an underground commercial center on
its way. Too little distance between the tunnel crown and the underground structure foundation will probably cause collapse
or excessive settlement during the tunnel construction based on studied geotechnical conditions of the region. In this paper,
a method of risk level assessment for various types of structures, such as frame and masonry structures, and various types
of foundation, such as continuous and isolated, is well defined and the risk level is classified. Moreover, the value of the
underground commercial center structure settlement is estimated using both empirical and numerical methods. The settlement risk level of the commercial center structure is determined based on presented definitions about risk classification of
various types of structures. Consequently, tunneling processes in this section need a special monitoring system and consolidation measures before the passage of a tunnel boring machine.