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ISSN : 2233-8292

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Vol.20 No.1
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교통환기력이 작용하는 터널 내 벽면마찰계수추정을 위한 프로그램 로직 개발

Development of a programming logic to estimate the wall friction coefficient in vehicle tunnels with piston effects

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2018, v.20 no.1, pp.39-53
https://doi.org/10.9711/KTAJ.2018.20.1.039
김효규 (㈜주성지앤비)
최판규 ((주)주성지앤비)
유지오 (신한대학교 자동차공학과)
이영훈 (한국도로공사)
김효규, 최판규, 유지오, & 이영훈. (2018). 교통환기력이 작용하는 터널 내 벽면마찰계수추정을 위한 프로그램 로직 개발. (사)한국터널지하공간학회, 20(1), 39-53, https://doi.org/10.9711/KTAJ.2018.20.1.039
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Abstract

Generally, the total ventilation resistance coefficient in a tunnel consists of inlet/outlet loss coefficient, wall friction coefficient, and other loss coefficient caused by sudden expansion and contraction of cross-section, etc. For the tunnel before opening, when the running ventilation fan is stopped, the wind speed in the tunnel is reduced by the total ventilation resistance drag. The velocity decay method is comparatively stable and easy to estimate the wall friction coefficient in the pre-opening tunnel. However, the existing study reported that when the converging wind speed is a negative value after the ventilation fan stops, it is difficult to estimate the wall friction coefficient according to the velocity decay method. On the other hand, for the operating tunnel in which the piston effect acts, a more complex process is performed; however, a reasonable wall friction coefficient can be estimated. This paper aims at suggesting a method to minimize the measurement variables of the piston effect and reviewing a method that can be applied to the operating tunnel. Also, in this study, a new method has been developed, which enables to calculate an variation of the piston effect if the piston effect is constant with a sudden change of external natural wind occurring while the wind speed in the tunnel decreases after the ventilation fan stops, and a programming logic has been also developed, which enables dynamic simulation analysis in order to estimate the wall friction coefficient in a tunnel.

keywords
공용 중 터널, 벽면마찰계수, 총환기저항계수, 동적 시뮬레이션, 속도감쇄법, Operating tunnel, Wall friction coefficient, Total ventilation resistance coefficient, Dynamic simulation, Velocity decay method

참고문헌

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