Evaluation of soil-structure interaction in underground structures, Case study of Tabriz Metro Line 2

mohammad sahbi¹

1) Islamic Azad University International Jolfa Branch

IOI Code : XAAK-CEKAE
Publication : 1st International Congress on Building Industry and 3rd international congress on Fundamental studies in Civil Engineering, Architecture and Urbanism(icbi2018.com)
Abstract :
    Due to the presence of underground spaces in cities, dynamic analysis of the tunnel under the influence of various factors is of particular importance. Considering that urban train tunnels are also used as emergency shelters in emergency situations, as well as considering that damage caused during the earthquake will lead to many dangers. Development of public transportation in areas On the one hand, the lack of space due to the heavy texture of large cities on the other hand has made excavation of the tunnel in buildings and structures inevitable. With this in mind, research is needed on the negative effects of tunneling on the bearing capacity of existing piles. In this study, by performing tunneling modeling in the vicinity of the small piles, we investigated the effect of tunneling drilling on the sewage situation in the presence of seismic force in the case of septic tanks. There are many documentary evidence based on office studies and field observations that indicate that the underlying soil of structures and the interaction of soil and structure during seismic events increased the seismic forces entering the structure, Many have led to the collapse of the structures. Due to the existence of underground spaces in cities, dynamic analysis of the tunnel under the influence of different factors is of particular importance. Considering that urban train tunnels are used as emergency shelters in emergency situations, and also because the damage caused during the earthquake has many dangers, the thesis examines the effects The depth of the tunnel in the subway structures has been modeled, taking into account the soil specifications in the reference literature and using the PLAXIS 2D finite element software, and also the behavioral model in this study is the Moher-Columbian behavior model. Finally, by performing modeling and analyzes, it was found that with increasing tunnel depth, the amount of settling in the tunnel crown increased and the amount of displacement in the crown and the floor of the tunnel was higher than the other tunnel points. Also, according to the results, overhead power has a great effect on the tunnel structure, so that with increasing depth the amount of calculated variables increases. By increasing the depth of the tunnel, the tunnel structure should be more resistant to the lateral forces (earthquake) Be.

Keywords : tunnel dynamic analysis finite element plaxis