The permafrost region is sensitive to all engineering activities such as road pavement or railway construction, since any disturb of its original state will cause instability of the thermal and mechanical state of frozen ground. The staged construction process has been proved to have significant influence on the formation of thermal state of roadbed on permafrost. Usually the cuts suffer more from the thermal state change in service time, in this case the thermal regime variation become a dominating influencing factor for roadbed stability. For this reason in this paper the temperature state considering the construction process was studied for the Berrkakit-Tammot-Yakutsk railway, which was constructed on permafrost in east Russia. A typical cut-and-fill section of roadbed on permafrost was selected for numerical simulation to study its thermal regime formation, on which the running stability of roadbed is directly related. The staged construction of roadbed was modeled. A computer program was created for the mentioned problem. The innovative feature is that the construction process including the cutting and filling work were both taken into account. The real construction sequence was adopted as input parameter in the numerical modeling for mesh producing and its subsequent correction. The computed results show realistic temperature distribution.
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