Small-radius curved shield tunnels have gradually become a popular research topic in the field of urban underground space development. This study presents a comprehensive numerical investigation of the construction mechanics of large-diameter shield tunnels in small-radius curved sections based on the Wuhan Lianghu Tunnel project. A three-dimensional finite element model was developed using ABAQUS, featuring dimensions of 160m width × 111m length × 110m depth . The dynamic construction process was accurately simulated through sequential modeling of tunnel advancement, segment assembly, and shield tail grouting using the element birth and death technique. The study investigated the influences of the shield tail clearance, construction load, and grouting parameters on the deformation of the tunnel segments and surrounding soil. The results show that surface displacement evolves into a characteristic “V”-shaped deformation pattern with maximum settlement reaching 16.03 mm. Quantitative analysis revealed that reducing shield tail clearance from 115 to 35mm decreased crown settlement by 46.2%. Furthermore, optimal performance was achieved with hardened grout elastic modulus exceeding 120 MPa, which reduced segment tensile stress by 16.7% compared to the 40 MPa condition. Therefore, the results of this study provide a practical reference for the expanded application of shield tunnel construction technology and parameter design.
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