Numerical Analysis of Optimization Design for Insulation Layer in Cold Regions Tunnel

Abstract:

Setting of insulation layer is widely recognized to prevent frost damage for tunnels constructed in cold region. Optimization design of insulation layers, however, still need deeply investigate. In this paper, taking Houanshan tunnel as example, two-dimensional finite element analysis on the optimization design of insulation layers has been carried out by ABAQUS. The tunnel temperature fields due to various thickness and length of insulation layer are numerically analyzed. It shows that ,1)4.85°C increased at backside of insulation layer with thickness of 5cm, while 5.8°C increased for thickness of 7cm;2) frozen depth of surrounding rock decrease with the increase of insulation layer thickness. The farther distance to tunnel portal, the smaller thickness of insulation layer required to prevent the surrounding rock from freezing;3)According to analysis, frost penetration length should be 450~500m before tunnel holing-through ,while 720m~830m after tunnel holing-through.

• Periodical: Advanced Materials Research (Volumes 1065-1069)
• Pages: 368-372
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1065-1069.368
• Online since: December 2014
• Authors: He Song*, Chao Liang Ye, Jun Feng Mi
• Keywords: Cold Regions Tunnel, Frost Penetration Length, Insulation Layer, Temperature Field

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