Thermal and mechanical characteristics of a thermal pile in permafrost regions

作     者：Yun-Hu SHANG Fu-Jun NIU Kun YUAN Tian SUN Li-Bo WU 

作者机构：State Key Laboratory of Frozen Soil EngineeringNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Da Xing'anling Observation and Research Station of Frozen-Ground Engineering and EnvironmentNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesJiagedaqi 165000China First Highway Consultants Co.Ltd.China Communications Construction Company LimitedXi'an 710075China Jiangsu Sunpower Technology Co.Ltd.Nanjing 210009China School of Civil Engineering and Hydraulic EngineeringNingxia UniversityYinchuan 750021China 

出 版 物：《Advances in Climate Change Research》 (气候变化研究进展（英文版）)

年 卷 期：2023年第14卷第2期

页      面：255-266页

核心收录：

学科分类：07[理学] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(2019QZKK0905) the National Natural Science Foundation of China(42001063,41961011) the Open Fund of State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions(YGY2020KYPT-04) CCCC Scientific and Technological Research Program(2020-ZJKJPTJS04) 

主　　题：Pile foundation Cold energy Two-phase closed thermosyphon Freezing strength Permafrost regions 

摘      要：Cast-in-place pile foundations are widely used in permafrost regions to support *** stability of cast-in-place pile foundations is highly sensitive to permafrost thermal regime *** degradation caused by climate change is increasing the disaster risk of castin-place pile ***,proactive cooling methods for cast-in-place pile foundations are seldom *** cold energy produced by two-phase closed thermosyphons(TPCTs)can efficiently prevent the permafrost thermal regime from being disturbed by engineering activities and climate *** were installed in a concrete pile forming a thermal ***,a model experiment was conducted to explore the thermal regime,influence scope,dissipation process of cold energy,and freezing strength of the thermal *** results indicated that the thermal pile may significantly cool the foundation *** of cold energy produced by the thermal pile dissipated during the warm period,and the cooling scope of the thermal pile can cover the area within a 40 cm(twice the pile diameter)radius around the ***,the TPCTs can significantly improve freezing strength between the thermal pile and frozen *** lesson learned from this study can provide a new approach to control the thermal regime of cast-in-place pile foundation in permafrost,which was of valuable to the construction of pile foundations in cold regions.