气候变化领域集成服务门户(CCPortal): Experimental Study on Thermal Regime and Frost Jacking of Pile Foundation During Operation Period in Permafrost Regions

CCPortal

DOI	10.3389/feart.2022.821305
	Experimental Study on Thermal Regime and Frost Jacking of Pile Foundation During Operation Period in Permafrost Regions
	Shang, Yunhu; Niu, Fujun; Fang, Jianhong; Wu, Libo
通讯作者	Niu, FJ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou, Peoples R China.
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	The stability of a cast-in-place pile foundation in permafrost region is primarily subject to the thermal regime and tangential frost-heave forces (TFF) during the operation period. However, studies focusing on the thermal and mechanical characteristics of pile foundation during runtime are rare. To investigate the effect of pile foundation on the thermal regime and quantify the magnitude of unit tangential frost-heave forces (UTFF), a field experiment was conducted on the Qinghai-Tibet Plateau, China. Results showed that the cast-in-place pile foundation enhanced the heat exchange between the atmosphere and soil, which expanded the annual range of the surrounding ground temperature. Furthermore, the permafrost table depth was increased by 0.4-0.7 m (0.33-0.58 times the pile diameter). The TFF increased significantly when the soil temperature decreased from 0 to -0.5 degrees C. Meanwhile, the thickness of the frost heaving layer was approximately double that of the active layer, in which the maximum UTFF was higher than 52.04 kPa. The adfreezing bond force of permafrost to pile shaft burdened most of the applied load, and the end bearing contributed relatively little. Findings from this study will benefit the stability maintenance and structure design of pile foundation in permafrost regions.
关键词	SCREW PILES
英文关键词	tangential frost-heave forces; cast-in-place pile foundation; thermal regime; permafrost region; frost heaving; frost jacking
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000761463000001
来源期刊	FRONTIERS IN EARTH SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253829
作者单位	[Shang, Yunhu; Niu, Fujun] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou, Peoples R China; [Shang, Yunhu] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Da Xinganling Observat & Res Stn Frozen Ground En, Jiagedaqi, Peoples R China; [Fang, Jianhong] Qinghai Res Inst Transportat, Xining, Peoples R China; [Wu, Libo] Ningxia Univ, Sch Civil Engn & Hydraul Engn, Yinchuan, Ningxia, Peoples R China
推荐引用方式 GB/T 7714	Shang, Yunhu,Niu, Fujun,Fang, Jianhong,et al. Experimental Study on Thermal Regime and Frost Jacking of Pile Foundation During Operation Period in Permafrost Regions[J]. 中国科学院西北生态环境资源研究院,2022,10.
APA	Shang, Yunhu,Niu, Fujun,Fang, Jianhong,&Wu, Libo.(2022).Experimental Study on Thermal Regime and Frost Jacking of Pile Foundation During Operation Period in Permafrost Regions.FRONTIERS IN EARTH SCIENCE,10.
MLA	Shang, Yunhu,et al."Experimental Study on Thermal Regime and Frost Jacking of Pile Foundation During Operation Period in Permafrost Regions".FRONTIERS IN EARTH SCIENCE 10(2022).