Deformation analysis of large-section quasi-rectangular shield construction on existing underground pipelines and power tunnel

This article is based on the large-section quasi-rectangular shield tunnel project of Zhengzhou Metro Line 8 in a water-rich sandy stratum. It systematically analyzes the deformation characteristics of existing underground pipelines and power-tunnels caused by quasi-rectangular shield construction through on-site monitoring. The research results show that shield tunneling induces stress redistribution in the surrounding soil, leading to varying degrees of deformation in underground pipelines and power-tunnels. Factors such as pipeline functionality, structural configuration, material properties, burial depth, and their relative position relative to the shield machine significantly influence deformation patterns. The deformation mode of the power-tunnel differs from that of pipelines, while also being significantly affected by shield construction parameters. Furthermore, this study explores key deformation control technologies and measures, providing valuable insights for similar projects.