| Summary: | Cement fly ash gravel (CFG) pile composite foundation is an effective and economicfoundation treatment approach, which is significant to building a foundation, subgrade construction,and so forth. The present paper aims to investigate the temperature behaviours of high latitudesand low altitude island permafrost when the CFG pile was constructed, in which FEM and fieldtemperature monitoring of permafrost was utilized. The proposed findings demonstrate that thetemperature disturbance of permafrost is obvious when the CFG pile was constructed, and thetemperature variation of CFG pile and permafrost in FEM has a good agreement with the results offield temperature monitoring. Additionally, the influence of different height subgrade on thetemperature field of CFG pile composite foundation was analyzed by FEM. The proposed findingsdemonstrate that the height of subgrade affects the maximum temperature increase of permafrostand the re-frozen time of permafrost after the construction of CFG pile composite foundation.
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