Document Type : Original Research Paper

Authors

• Milad Manafi ¹
• Hamed Molladovoodi ¹
• Hamid Chakeri ²

¹ Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran

² Associate Professor, Department of Mining Engineering, Sahand University of technology, Tabriz, Iran

Abstract

Tunneling in urban areas is associated with various challenges that must be carefully evaluated during pre-construction studies. Among these challenges, tunnel excavation through fault zones is particularly critical and has been widely investigated. Previous studies have primarily focused on the displacement of tunnel linings under different fault movement conditions. In the present study, the effects of three key parameters, ground movement magnitude, grout layer thickness, and fault plane angle, on the induced bending moments and normal forces were examined. The numerical results indicate that ground movement magnitude has the most significant influence on induced stresses, whereas grout layer thickness and fault plane angle exhibit comparable effects. The analyses further show that a 100% increase in ground movement leads to a 60.67% rise in the induced normal force. Increasing the grout layer thickness reduces the induced forces by 32.9%, while a larger fault plane angle decreases the normal force by 34.52%. The modeling outcomes also reveal that grout layer thickness is the most influential factor effecting the induced bending moments. These findings provide valuable insights for evaluating the structural capacity and potential failure of tunnel lining crossing fault zones.

Keywords

• Segmental lining
• Fault displacement
• FLAC3D
• Dip-slip faults

Main Subjects

• Numerical Modelling