Damaged Pipe Segment Repair and Reinforcement Technology Based on Finite Element Simulation Analysis Method

Shield tunnel segments, as a single-layer lining structure for tunnels, serve as crucial barriers to ensuring the safety of the structure. Although shield tunneling engineering has formed a relatively mature structural design theory and engineering practice system, the quality of subway shield tunnel construction is affected by factors such as ground loading, excavation of surrounding foundation pits, abundant groundwater sources, and excavation construction. However, unresolved quality problems persist, particularly those prone to occur between segment rings, segments, and blocks, such as leakage, cracks, misalignment, and collapse of segments. These issues can lead to tunnel leakage or rupture. Simple repairs to segment strength alone are insufficient to meet the requirements. This article examines the civil engineering of the Guangzhou Metro Line 11, specifically the shield tunnel section of the Guangjian Branch project, which is synchronously implemented between Datang Station and Shiliugang Station. By analyzing conventional methods for repairing damaged shield tunnel segments, a technology for repairing and reinforcing damaged segments based on finite element simulation analysis has been developed. The finite element method is used to analyze and calculate the damaged segments, and steel ring reinforcements are constructed in the damaged area to enhance the tunnel structure's safety under future use conditions. The practical results show that using this technology for construction greatly improves the safety factor (R/S) of the reinforced lining structure, and the crack width of the pipe segments meets the requirements, which can provide reference for other similar projects.