Affiliation:
1. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China
Abstract
With the continuous development of urban underground spaces, new underground engineering approaches are becoming more similar to existing operating tunnels. Existing research is typically concerned with the impact of a single project, such as a new tunnel or deep excavation, on existing shield tunnels. There are few studies on the influence of both excavation and overcrossing tunneling on operational tunnels. Taking a section ranging from the Chengzhan Station to the Jiangcheng Road Station of Hangzhou Metro Line 7 as a case study, this study analyzes the automatic monitoring data of the existing tunnel within this section. Through data analysis, the influences of deep excavation and shield tunneling on the vertical settlement, horizontal displacement, segment convergence, and differential settlement of the tunnel ballast of the adjacent existing line segment are assessed. The influence of deep excavation and overcrossing tunneling on multiple disturbances of existing line tunnels is summarized. This study will be useful for similar projects involving deep excavation next to existing tunnels and overcrossing tunneling, as it will help clarify the protection range of existing lines and determine the displacement alarm value of existing structures.
Funder
National Natural Science Foundation of China
Subject
Civil and Structural Engineering
Reference43 articles.
1. Research on deformation and control of shield construction of four-line overlapping tunnels;Q. J. Meng;Chinese Journal of Underground Space and Engineering,2019
2. Numerical investigation of the failure of a building in Shanghai, China
3. The effect of excavation unloading on the deformation of existing underlying shield tunnel;M. Y. Hu
4. Investigation of response of metro tunnels due to adjacent large excavation and protective measures in soft soils
5. Response of a Taipei Rapid Transit System (TRTS) tunnel to adjacent excavation