A unified displacement function to analytically predict ground deformation of shallow tunnel. (June 2019)

• Record Type: Journal Article
• Authors: Lu, Dechun; Kong, Fanchao; Du, Xiuli; Shen, Chenpeng; Gong, Qiuming; Li, Pengfei
• Is Part Of: Tunnelling and underground space technology. Volume 88(2019)
• Page Start: 129
• Page End: 143
• Publication Date: 2019-06
• Subjects: Shallow tunnel -- Unified displacement function -- Asymmetrical deformation modes -- Complex variable solution -- Ground deformation; Tunneling -- Periodicals; Underground construction -- Periodicals; Tunnels -- Periodicals; Underground areas -- Periodicals; 624.193
• DOI: 10.1016/j.tust.2019.03.005
• Languages: English
• ISSNs: 0886-7798

Abstract

Abstract: A unified displacement function of the cross-section of a circular shallow tunnel, expressed by the Fourier series, is proposed. The unified displacement function can reflect main deformation behaviors of the tunnel cross-section. Five basic deformation modes corresponding to the expansion order n = 2 show the horizontal and vertical asymmetrical deformation, which is a complete deformation mode. This complete displacement mode is implemented into the complex variable solution for analytically predicting the tunnelling-induced ground deformation. The effects of the tunnel cross-section deforming parameters and the "Buoyancy effect" on the displacement field are discussed. Case studies from the section MS-5 of the Docklands Light Railway Lewisham Extension are used to verify the capacity and applicability of the proposed solution. The presented solution provides a simplified indication for evaluating the tunnel deformation under complex geological and construction conditions.