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analysis of the theoretical foundation and engineering effect for air-duct embankment on the qinghai-tibet railway
Author(s): 
Pages: 153-160
Year: Issue:  2
Journal: Engineering Sciences

Keyword:  GetLinkList(KeywordFilter('Qinghai-Tibet railway air-duct embankment application permafrost engineering')'kw''CJFQ');
Abstract: Based on the corresponding theories of engineering thermodynamics and hydro-dynamics, a careful study is made of the characteristics of air flow in different duct-embedded ways. According to critical Reynolds number, the atmospheric critical velocity of the duct with different diameters, which makes laminar flow different from turbulent flow, is calculated. Given the condition in which a forced flow occurs and the wind strength is larger than the atmospheric pressure gradient along the air-duct, a rational ratio of the length to the diameter is presented. Based on the above theory and field test data on soil temperature and embankment settlement, the advantages and disadvantages are discussed in details of all duct-embedded ways that might affect the stability of embankment.
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