Study on the control of construction impacts of shield tunnels in close proximity to sensitive buildings. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Dai, Zeyu; Li, Peinan; Kou, Xiaoyong; Xue, Jianzhong; Luo, Li
• Is Part Of: IOP conference series. Volume 861:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/861/5/052093
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: The construction of interchange passages, which are important appurtenances to metro traffic, often has problem of close proximity to existing buildings. This paper takes the shield excavation project of interchange passage at Jinjiadu Station of Hangzhou Metro Line 2 and Line 4 as an example, and aims to study the impact of shield on existing buildings when crossing them in close proximity. The shield excavation area has a minimum clearance of 1.09 m from the bottom of the station, and the twin tunnel cross a total of six lattice piles with a closest distance of 0.176 m. In order to reduce the impact of the shield excavation on the existing buildings, the excavation area was pre-reinforced with permafrost reinforcement protection measures. A 3D finite element model was built to study the deformation of the existing building under the reinforcement measures. By studying the key construction parameters, the results show that in this project a smaller Propulsion pressure and grouting pressure and a larger grouting volume can effectively reduce the impact of construction on the existing building.