气候变化领域集成服务门户(CCPortal): Thermal characteristics of cast-in-place pile foundations in warm permafrost at Beiluhe on interior Qinghai-Tibet Plateau: Field observations and numerical simulations

CCPortal

DOI	10.1016/j.sandf.2020.01.008
	Thermal characteristics of cast-in-place pile foundations in warm permafrost at Beiluhe on interior Qinghai-Tibet Plateau: Field observations and numerical simulations
	Hou X.; Chen J.; Jin H.; Rui P.; Zhao J.; Mei Q.
发表日期	2020
ISSN	2697491
起始页码	90
结束页码	102
卷号	60 期号:1
英文摘要	Cast-in-place pile foundations are widely employed to support basic infrastructures on the Qinghai-Tibet Plateau (QTP). However, concrete hydration heat substantially affects the thermal stabilization of pile foundations in permafrost regions. In this paper, the thermal characteristics of a cast-in-place pile foundation in a warm (>−1 °C) permafrost region on the interior QTP were studied via field observations and numerical simulations. The temperature field observations showed that the peak temperature of the pile foundation occurred two days after the concrete was poured, and that positive temperatures of the pile foundation lasted 21 days. The temperatures at different depths of the pile foundation dropped below 0 °C 93 days after the concrete was poured. However, even 224 days after the concrete was poured, the temperatures in the pile foundation were still higher than that of the natural ground. Based on the observational data, three-dimensional numerical models were established to analyze the thermal disturbances and the freezing process. The results showed that the thickness of the thermal disturbance annulus around the pile foundation was 1.6 m, namely, twice the pile diameter. It would take approximately 420 days for the temperatures in the pile foundation to recover to approximately that of the natural ground. When the mean annual ground temperature (MAGT) decreased, the thickness of the thermal disturbance annulus around the pile foundation increased, and the freezeback time of the pile foundation decreased. © 2020
英文关键词	Cast-in-place pile foundation; Field observation; Freezeback process; Numerical simulation; Warm permafrost
语种	英语
scopus关键词	Soils and Foundations
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158466
作者单位	Beiluhe Observation and Research Station of Frozen Soil Engineering and Environment, State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environmental and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China
推荐引用方式 GB/T 7714	Hou X.,Chen J.,Jin H.,et al. Thermal characteristics of cast-in-place pile foundations in warm permafrost at Beiluhe on interior Qinghai-Tibet Plateau: Field observations and numerical simulations[J],2020,60(1).
APA	Hou X.,Chen J.,Jin H.,Rui P.,Zhao J.,&Mei Q..(2020).Thermal characteristics of cast-in-place pile foundations in warm permafrost at Beiluhe on interior Qinghai-Tibet Plateau: Field observations and numerical simulations.,60(1).
MLA	Hou X.,et al."Thermal characteristics of cast-in-place pile foundations in warm permafrost at Beiluhe on interior Qinghai-Tibet Plateau: Field observations and numerical simulations".60.1(2020).