Numerical investigation of settlement effect caused by tunneling on surface structures based on pile group

Subject Areas : Structural Engineering

Alireza Darvishpour ¹ , Asadollah Ranjbar Karkanaki ² , Hossein Meshki ³ , Mohsen Parviz ⁴

1 - Department of Civil Engineering, Robatkarim Branch, Islamic Azad University, Robatkarim, Iran.
2 - Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran
3 - Department of Civil Engineering, Robatkarim Branch, Islamic Azad University, Robatkarim, Iran.
4 - Structural Engineering, Iranian Academic Center for Education, Culture and Research (ACECR), Bushehr Branch, Iran.

Received: 2023-08-26 Accepted : 2023-12-05 Published : 2023-11-01

Keywords: tunnel, Concrete structure, Pile group, superstructure, Soil-Pile-Structure Interaction,

Abstract :

In this study, an attempt has been made to investigate the effect of various factors on the super structures by modeling the structures based on the pile group and its interaction with urban tunnels. The effect of various parameters such as the presence of pile group, the horizontal distance of the center of the tunnel from the center of the foundation, the vertical distance of the tunnel to the tip of the piles, the length of the piles and the height of the super structure on the tunnel-soil-structure interaction has been investigated. Based on the analysis, it was observed that the placement of the pile group in the substructure will lead to the reduction of settlement caused by tunneling in the superstructure. From the point of view of the horizontal distance of the tunnel from the center of the superstructure.The location of the structure in the critical range of the tunnel, which includes two lines with the internal friction angle of the soil relative to the vertical, the structure has the greatest impact from tunneling The increase in the length of the piles due to the change in the axial force of the piles increases the period of the foundation and vice versa reduces the settlement of the structure. In general, the side piles in the pile group are less affected by tunneling, but the central pile suffers a significant decrease in axial force.