Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
During tunneling, the permafrost surrounding the tunnel lining is prone to different types of collapse failure, such as peeling and falling off, owing to the emission of heat. The thawed surrounding permafrost severely threatens the tunnel stability. To investigate the deformation mechanism of the thawed surrounding permafrost, an elasto-plastic model was established under the Tresca failure criterion. For the permafrost cohesion that begins to decrease after thawing, the function considering the variation of the cohesion, the radius, and the thawing depth was obtained. The decrease of cohesion in the thawed frozen soil has a significant effect on the deformation of the plastic zone, a larger thawing depth leads to a larger cohesion variation depth. Therefore, both the maximum deformation and the maximum radius of the plastic zone increase. The analytical solution is in good agreement with the numerical simulation result and the monitoring data obtained for the Fenghuoshan Tunnel of the Qinghai- Tibet Railway. Thus, the proposed solution considering the thawing zone can predict the deformation around the permafrost tunnel and provides a feasible reference for permafrost tunnel engineering.
During tunneling, the permafrost surrounding the tunnel lining is prone to different types of collapse failure, such as peeling and falling off, owing to the emission of heat. The thawed surrounding permafrost severely threatens the tunnel stability. To investigate the deformation mechanism of the thawed surrounding permafrost, an elasto-plastic model was established under the Tresca failure criterion. For the permafrost cohesion that begins to decrease after thawing, the function considering the variation of the cohesion, the radius, and the thawing depth was obtained. The decrease of cohesion in the thawed frozen soil has a significant effect on the deformation of the plastic zone, a larger thawing depth leads to a larger cohesion variation depth. Therefore, both the maximum deformation and the maximum radius of the plastic zone increase. The analytical solution is in good agreement with the numerical simulation result and the monitoring data obtained for the Fenghuoshan Tunnel of the Qinghai- Tibet Railway. Thus, the proposed solution considering the thawing zone can predict the deformation around the permafrost tunnel and provides a feasible reference for permafrost tunnel engineering.
Deformation of Thawed Surrounding Rock During Tunneling in Permafrost
Soil Mech Found Eng
Soil Mechanics and Foundation Engineering ; 59 ; 565-575
01.01.2023
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| Engineering Index Backfile | 1964
Formation of the supporting zone round a pile driven into thawed permafrost ground
| Online Contents | 1965
Anchorage pier structure suitable for surrounding rock deformation
| Europäisches Patentamt | 2015