Parametric analysis of the interaction between parallel tunnels and the surrounding ground based on their relative position and excavation process (Case study: for tunnels built in the urban environment of Shiraz)

Tunnels have been built in the neighborhood as a result of the growth of the transportation industry. These tunnels are built crosswise or parallel to each other, not level. The distribution of stress around the tunnels and the behavior of the ground are affected by the location of these tunnels relative to each other and the drilling process. Accidents can occur due to a lack of understanding of the behavior of adjacent structures. As a result, understanding these structures is critical. The goal of this research is to fully investigate the impact of parallel tunnel drilling on inductive forces on the first tunnel's maintenance cover and subsidence in order to better understand the behavior of nearby structures. These analyses were carried out in this paper using the plaxis 2D finite element method. According to the findings, the amount of surface subsidence decreases as the horizontal distance between the two tunnels increases, while the amount of surface subsidence increases as the vertical distance between the tunnels increases. Increasing the depth of the second tunnel has also increased the inductive load and bending moment on the first tunnel's maintenance cover. Increasing the vertical distance between the two tunnels on the desired outlets causes more changes than increasing the horizontal distance.