Study on the Loading and Deformation of Tunnel Segments in Soft Clay with Consideration for the Soil Mass Rheological Characteristics

• Published in: Geotechnical and geological engineering Vol. 37; no. 2; pp. 673 - 682
• Main Author: Li, Chunlin
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.04.2019; Springer Nature B.V
• Subjects: Algorithms; Case studies; Cavity expansion; Civil Engineering; Clay; Constitutive models; Creep tests; Deformation; Earth and Environmental Science; Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Hydrogeology; Mathematical models; Modelling; Original Paper; Rheological properties; Soft clay; Soil; Soil creep; Soil investigations; Solifluction; Subway engineering; Terrestrial Pollution; Tunnel linings; Tunnels; Viscoelasticity; Waste Management/Waste Technology; Shield tunnel; Segments; Supporting force; Creep model
• DOI: 10.1007/s10706-018-0637-1
• ISSN: 0960-3182

A nonlinear visco-elastic–plastic creep constitutive model is established combined with a Bingham creep model and a Kelvin creep model. Additionally, the soil creep parameters of an undisturbed soil specimen from the Wuxi subway engineering investigation site are determined according to triaxial creep testing using the ordinary least square algorithm. The ground characteristic curves considering the time effect are proposed by combing the creep equation and cavity expansion theory. Finally, the change laws of segment support force and segment deformation as a function of time were investigated through a case study of a section of the Wuxi Subway Line No. 1, and the proposed analytical solution and numerical modeling provide consistent results for tunnel lining pressure.