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

초고속 튜브철도 시스템을 위한 튜브 구조물의 기밀성 평가 : I. 해석모델 수립 및 재료 기밀성

  • 박주남 (한국철도기술연구원 철도구조연구실) ;
  • 남성원 (한국철도기술연구원 철도환경연구실) ;
  • 김이현 (한국철도기술연구원 철도구조연구실) ;
  • 여인호 (한국철도기술연구원 철도구조연구실)
  • Received : 2010.12.17
  • Accepted : 2011.03.20
  • Published : 2011.04.26

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.

Acknowledgement

Supported by : 한국철도기술연구원

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Cited by

  1. Air-tightness Evaluation of Tube Structures for Super-speed Tube Railway Systems: II. System Test and Parametric Analysis vol.14, pp.2, 2011, https://doi.org/10.7782/JKSR.2011.14.2.151
  2. Probabilistic Study on Pressure Behavior in Concrete Vacuum Tube Structures vol.17, pp.3, 2014, https://doi.org/10.7782/JKSR.2014.17.3.186