Citation Search Quick Search
  2023, Vol. 42 Issue (S1): 3687-3699    DOI: 10.13722/j.cnki.jrme.2022.0562
Artiles Current Issue | Archive | Adv Search |
Study on thermal diffusion characteristics and influence range of an artificial heat source inside embankment in cold regions
HU Tianfei1,2,WANG Li3,YUE Zurun1,2,XU Lixia3,LIU Jihua3
(1. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;2. Key Laboratory of Mechanical Behavior Evolution and Control of
Traffic Engineering Structures in Hebei,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;
3. School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China)
Download: PDF (4330 KB)   HTML (1 KB) 
Export: BibTeX | EndNote (RIS)      
Abstract  In order to address the frost heave problem of railway embankment in cold regions,an artificial heating system and a distributed heating scheme based on ground source heat pump technology was proposed. A full scale half-width embankment test platform of class I single-track railway was built,and the temperature field of embankment was monitored. The effective heating influence radius of the heating system was defined as the longitudinal range within which the embankment freezing depth is controlled below the harmful threshold within a certain time,and a prediction method of the effective heating influence radius was put forward. The test results show that the heating temperature of the heat pump system can reach above 30 ℃,the coefficient of performance(COP) can be as high as 6.9,and both the effective heating capacity and COP gradually decrease with time. The temperature rise amplitude of soil decreases with the distance from heat source,and the temperature increment rate in the vertical direction around the heating pipe is greater than that in the longitudinal direction along embankment. Artificial heating has a significant inhibitory effect on the impact of cold wave weather. At the end of the test,the freezing depth within 2.0 and 3.0 m on both sides of the heating system is controlled within 30 and 35 cm respectively. The heating influence radius is proportional to both heating time and the harmful freezing depth threshold. When the harmful freezing depth threshold is 30,35,40 cm,the effective heating influence radius is 0.44 m,0.64 m,0.83 m respectively when heating for 5 days;and if the heating influence radius needs to reach 1.5 m,the heating time should be 53,41,35 d respectively. In application,the longitudinal layout spacing of heating systems along the embankment should be reasonably designed according to the harmful freezing depth threshold and the required treatment time after the appearance of frost heave,so as to ensure the merge of thawing range of adjacent heating systems within the specified time.
Key wordssubgrade engineering      embankment frost heave      ground source heat pump      heating temperature      temperature field      freezing depth      effective heating influence radius     
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
HU Tianfei1
2
WANG Li3
YUE Zurun1
2
XU Lixia3
LIU Jihua3
Cite this article:   
HU Tianfei1,2,WANG Li3, et al. Study on thermal diffusion characteristics and influence range of an artificial heat source inside embankment in cold regions[J]. , 2023, 42(S1): 3687-3699.
URL:  
https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0562      OR      https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3687
Copyright © 2005-2015 Edited and Published by Editorial Office for Chinese Journal of Rock Mechanics and Engineering
Sponsored by : Chinese Society for Rock Mechanics and Engineering 
Published by : Science Press 
Address: Wuhan 430071, China  Tel: (027)87199250  Fax: (027)87199250  Email: rock@whrsm.ac.cn
DESIGNED BY: Beijing Magtech Science & Technolgy Development Co.,Ltd.
鄂公网安备 42010602003581号