Shield tunnel uplift and deformation characterisation: A case study from Zhengzhou metro

Excavation in close proximity to the existing shield tunnel often leads to impacts on the stability of tunnel. However, interventions committed to mitigate the impacts may not be effective in preventing tunnel movement and/or deformation from occurring. This study presents a case history where two shield tunnels pass between two excavation pits belonging to the east square of the existing Zhengzhou East High Speed Rail (HSR) station. The centre...