Thermal and Mechanical Response of Soil and Tunnel during Replacement of Shield Tail Brush by Freezing Method

• Published in: KSCE journal of civil engineering Vol. 24; no. 5; pp. 1632 - 1640
• Main Authors: Wang, Xu-Yang, Yuan, Da-Jun, Jin, Da-Long, Su, Wei-Lin
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Civil Engineers 01.05.2020; Springer Nature B.V; 대한토목학회
• Subjects: Brushes; Civil Engineering; Coefficients; Construction accidents & safety; Dredging; Engineering; Excavation; Finite element method; Freezing; Frost heaving; Geotechnical Engineering & Applied Earth Sciences; Industrial Pollution Prevention; Liquid nitrogen; Mathematical models; Mechanical analysis; Nitrogen; Numerical models; Rivers; Simulation; Soil; Soil mechanics; Soil temperature; Soils; Tails; Temperature fields; Thermal expansion; Tunnel Engineering; Tunneling shields; Tunnels; 토목공학; Sequential thermo-mechanical coupling; Replacement of shield tail brush; Displacement field; Numerical simulation; Temperature field; Liquid nitrogen freezing
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-020-1591-z

In the long-distance shield tunneling process, the shield tail brush needs to be replaced after wear failure, especially in cross-river and cross-sea tunnel projects. Taking the shield tail brush replacement project of Qingchun Road tunnel in Hangzhou, China as the research background, a three-dimensional sequential thermo-mechanical coupled numerical simulation was carried out to study the shield tail brush replacement with liquid nitrogen freezing by ABAQUS software. The development of temperature fields and displacement fields of soil, and the deformations of the tunnel sections along the longitudinal direction induced by freezing were obtained. The numerical model was further validated by site measurement. In addition, the effects of the frozen wall thickness, buried depth, excavation radius, and coefficients of linear thermal expansion of soils on the frost heave were studied.