Explanation for twin tunnelling-induced surface settlements by changes in soil stiffness on account of stress history. (March 2019)

• Record Type: Journal Article
• Authors: Zhang, Tianqi; Taylor, R. Neil; Divall, Sam; Zheng, Gang; Sun, Jibin; Stallebrass, Sarah Elizabeth; Goodey, Richard James
• Is Part Of: Tunnelling and underground space technology. Volume 85(2019)
• Page Start: 160
• Page End: 169
• Publication Date: 2019-03
• Subjects: Twin tunnelling -- Modified Cam Clay model -- Three-Surface Kinematic Hardening model -- Stiffness of soil; Tunneling -- Periodicals; Underground construction -- Periodicals; Tunnels -- Periodicals; Underground areas -- Periodicals; 624.193
• DOI: 10.1016/j.tust.2018.12.015
• Languages: English
• ISSNs: 0886-7798

Abstract

Abstract: In this article, a group of representative centrifuge tests were selected for numerical modelling to explain the surface settlements induced by sequential twin tunnelling. Both Modified Cam Clay model (MCC) and Three-Surface Kinematic Hardening model (3-SKH) were adopted in the simulation, which indicated the use of 3-SKH model conduced to mimicking more closely centrifuge model response. Via performing more contrastive numerical analyses with 3-SKH model, the influence of the first tunnel event on the stiffness of the soil around the second tunnel was quantitatively investigated, whereby the mechanism behind the observed surface settlements was finally made clear.