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http://dx.doi.org/10.7782/JKSR.2011.14.2.143

Air-tightness Evaluation of Tube Structures for Super-speed Tube Railway Systems: I. Analytical Modeling and Material Test  

Park, Joo-Nam (한국철도기술연구원 철도구조연구실)
Nam, Seong-Won (한국철도기술연구원 철도환경연구실)
Kim, Lee-Hyeon (한국철도기술연구원 철도구조연구실)
Yeo, In-Ho (한국철도기술연구원 철도구조연구실)
Publication Information
Journal of the Korean Society for Railway / v.14, no.2, 2011 , pp. 143-150 More about this Journal
Abstract
This paper presents a preliminary study for air-tightness evaluation of vacuum tube structures for super-speed tube railway systems. The formula for flow rate of the air caused by the pressure difference of the inside and outside of the tube structure is derived based on Darcy's law. A test is then performed to measure the air-permeability of concrete with various compressive strengths, the result of which is used for analytical simulation of the air intrusion for a tube structure with a preliminarily defined section. It has been shown that concrete with the compressive strength of at least more than 50MPa is recommended for effective operation and maintenance of the vacuum pump systems, as the air-permeability of concrete is inversely proportional to the exponent of its compressive strength.
Keywords
Vacuum tube; Ultra high-speed tube; Concrete air-tightness; Concrete air permeability;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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