Analysis of shield tunnel response to bilateral pit excavation with a focus on perimeter pressure and deformation mechanisms

作者：Zhiyuan Mu, Gang Wei, Zhiguo Zhang, Haibo Jiang, Tianbao Xu, Yongjie Qi · 发表于：Scientific Reports · 年份：2024 · DOI：10.1038/s41598-024-72731-2 · 被引用次数：7 · 研究领域：Geotechnical Engineering and Analysis、Civil and Geotechnical Engineering Research、Grouting, Rheology, and Soil Mechanics

This study aims to investigate the responses of shield tunnel structures subjected to disturbances caused by bilateral pit excavation, and it systematically reveals for the first time the impact mechanism of bilateral pit excavation on the distribution of perimeter pressure and deformation patterns of shield tunnels. Using a bilateral pit excavation project in Nanjing as a case study, this research establishes methods for calculating longitudinal displacement and circumferential pressure of tunnels under bilateral pit excavation conditions, employing the image source method for analysis. A refined three-ring segment model is developed, and the load structure method is used to analyze the impact of deep foundation excavation on the tunnel located between the two excavation sites. The results indicate that, compared to unilateral excavation, bilateral excavation significantly increases the perimeter pressure at the top and bottom of the tunnel, with a smaller increase in pressure at the arch waist. The deformation pattern is characterized by contraction at the top and bottom and expansion at the waist, forming a transverse elliptical deformation. The maximum vertical convergence values of the middle segment ring are 25.00 mm at the top and 25.88 mm at the bottom, with a vertical absolute convergence value of 44.5 mm and a convergence ratio (Δ D t / D t ) of 0.72%. As the foundation coefficient increases, the perimeter pressure at the top and bottom of the tunnel also increases....