Coupled Analysis of Granular Distinct Element Method and Finite Difference Method on the Effect of Inner Reinforcement of Tunnel Lining

Key Points

• The aim is to establish a design method that effectively evaluates the impact of inner reinforcement on tunnel lining strength.
• Developed a coupled analysis method combining granular distinct element and finite difference methods.
• Modeled tunnel linings using distinct element analysis for damaged structures.
• Applied finite difference methods using shell elements for the analysis of inner reinforcement.
• Conducted simulations on full-scale structures subjected to reloading with and without reinforcement.
• Confirmed the effectiveness of inner reinforcement in improving load capacity of damaged tunnel linings.
• Identified issues related to structural separation, such as cracking and delaminating of carbon fiber sheets.
• Demonstrated a new analytical approach with practical applicability for tunnel lining evaluation.