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	Laboratory test on the combined cooling effect of L-shaped thermosyphons and thermal insulation on high-grade roadway construction in permafrost regions
	Dong, YuanHong; Lai, YuanMing; Zhang, MingYi; Li, ShuangYang
发表日期	2009
ISSN	1674-3822
起始页码	307
结束页码	315
卷号	1 期号:4
英文摘要	With the completion of the Qinghai-Tibetan Railway, economic development of related areas has been greatly accelerated. This, in return, calls for building or upgrading more roadways, especially high-grade roadways. In cold regions, the thawing of permafrost can induce settlement damage of and even failure to railway (or roadway) embankments. Thermosyphons (self-powered refrigeration devices that are used to help keep the permafrost cool) have proved effective in mitigating thaw settlement by maintaining the thermal stability of the embankments. However, for high-grade roadway embankments of great width, stabilizing or cooling effects of traditional geotechnological measures may be limited. To enhance the cooling effect of thermosyphons, an L-shaped thermosyphon was designed. A laboratory test was carried out to study the combined cooling effect of the L-shaped thermosyphon and thermal insulation applying to roadbed construction. The angle between the evaporator and condenser sections of the L-shaped thermosyphon is 134 degrees, and the L-shaped thermosyphon was inserted into the soil at an angle of 5 degrees with the road surface. The tested results show that the L-shaped thermosyphon is effective in removing heat from a roadway in winter. When the ambient air temperature is lower than the soil temperature, the thermosyphon is active and extracts the heat in the soil around it. When the ambient air temperature is higher than the soil temperature, the thermosyphon is inactive, and no heat is injected into the soil through the L-shaped thermosyphon. Compared to embankments with straight thermosyphons, the inner parts of the embankments with L-shaped thermosyphons were significantly cooled. It is hoped that the present study would be useful to the application of L-shaped thermosyphons in the construction of high-grade roadways in cold regions.
英文关键词	L-shaped thermosyphon; thermal insulation; cooling effect; foundation soils; high-grade roadway
语种	英语
WOS研究方向	Physical Geography
WOS类目	Geography, Physical
WOS记录号	WOS:000422272500003
来源期刊	SCIENCES IN COLD AND ARID REGIONS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239535
作者单位	[Dong, YuanHong; Lai, YuanMing; Zhang, MingYi; Li, ShuangYang] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Dong, YuanHong,Lai, YuanMing,Zhang, MingYi,et al. Laboratory test on the combined cooling effect of L-shaped thermosyphons and thermal insulation on high-grade roadway construction in permafrost regions[J],2009,1(4).
APA	Dong, YuanHong,Lai, YuanMing,Zhang, MingYi,&Li, ShuangYang.(2009).Laboratory test on the combined cooling effect of L-shaped thermosyphons and thermal insulation on high-grade roadway construction in permafrost regions.SCIENCES IN COLD AND ARID REGIONS,1(4).
MLA	Dong, YuanHong,et al."Laboratory test on the combined cooling effect of L-shaped thermosyphons and thermal insulation on high-grade roadway construction in permafrost regions".SCIENCES IN COLD AND ARID REGIONS 1.4(2009).