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ISSN : 2233-8292

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Vol.20 No.2
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현장측정을 통한 터널 내 벽면마찰계수추정 연구

The estimation of the wall friction coefficient in tunnels by in-situ measurement

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2018, v.20 no.2, pp.405-421
https://doi.org/10.9711/KTAJ.2018.20.2.405
김효규 (㈜주성지앤비)
최판규 ((주)주성지앤비)
이호형 ((주)주성지앤비)
백두산 ((주)주성지앤비)
나광훈 ((주)이음엔지니어링)
김효규, 최판규, 이호형, 백두산, & 나광훈. (2018). 현장측정을 통한 터널 내 벽면마찰계수추정 연구. (사)한국터널지하공간학회, 20(2), 405-421, https://doi.org/10.9711/KTAJ.2018.20.2.405
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초록

현재 국내터널에 적용중인 벽면마찰계수는 단순히 외국의 연구결과를 인용하여 사용하고 있는 실정이다. 또한 기존 선행연구들에서는 속도감쇄법을 이용하여 벽면마찰계수를 추정하였으나, 터널 내 수렴풍속이 음수(-)이거나 자연풍의 변화가 있는 경우에는 벽면마찰계수에 대한 추정이 어려운 점이 있었다. 이에 따라 본 연구에서는 기존 속도감쇄법과 더불어 동적 시뮬레이션기법을 적용하여 벽면마찰계수를 추정하였다. 분석결과, 총 9개 터널(양방향 18개 튜브)에대한 터널 내 마찰계수는 0.011~0.025 정도로 분석되었으며, 평균값은 0.020로 추정되었다. 또한, 본 연구를 통해 정량적으로 획득한 벽면마찰계수를 현재 적용중인 설계기준과 비교하였다.

keywords
벽면마찰계수, 총환기저항계수, 동적 시뮬레이션, 속도감쇄법, 현장측정, Wall friction coefficient, Total ventilation resistance coefficient, Dynamic simulation, Velocity decay method, In-situ measurement

Abstract

In most of cases, the wall friction coefficients applied for local tunnel design are quoted directly from foreign data or local design guideline. In the previous studies, the wall friction coefficient was estimated using the velocity decay method. However, it is difficult to estimate the wall friction coefficient when the convergence wind velocity in the tunnel is negative (-) or if there is a change in the natural wind. Therefore, in this study, the wall friction coefficient is estimated by applying the dynamic simulation technique in addition to the conventional the velocity decay method. As a result of the analysis, the coefficient of wall friction in the tunnels for the total of 9 tunnels (18 tubes both directions) was 0.011~0.025, and the mean value was estimated to be 0.020. In addition, the wall friction coefficient obtained quantitatively through this study was compared with the current design criteria.

keywords
벽면마찰계수, 총환기저항계수, 동적 시뮬레이션, 속도감쇄법, 현장측정, Wall friction coefficient, Total ventilation resistance coefficient, Dynamic simulation, Velocity decay method, In-situ measurement

참고문헌

1.

De Bruin, A.C., Maarsingh, R.A., Swart, L. (1997), "New attempts to solve an old problem: aerodynamic measurements in new vehicle tunnels", Proceedings of the 9th International Symposium on Aerodynamics and Ventilation of Vehicle Tunnels, Aosta Valley, Italy, pp. 3-23.

2.

Kim, H.G., Choi, P.G., Ryu, J.O., Lee, Y.H. (2018), "Development of a programming logic to estimate the wall friction coefficient in vehicle tunnels with piston effects", Journal of Korean Tunnelling and Underground Space Association, Vol. 20, No. 1, pp. 39-53.

3.

Lee, K.B., Lee, C.W., Kim, H.G. (2004), "An in-situ study of the wall friction coefficient in road tunnels", Proceedings of the Korean Society for Rock Mechanics, 2004 Fall Conference, Daejeon , pp. 61-72.

4.

MOLIT (Ministry of Land, Infrastructure and Transport) (2011), Road design manual (617. ventilation), pp. 617-45-617-46.

5.

Moody, L.F. (1944), "Friction factor for pipe flow", Transactions of the American Society of Mechanical Engineers, Vol. 66, No. 8, pp. 671-681.

6.

Park, Y.D. (1989), Fluid mechanics, Bosung-munhwasa, Seoul, pp. 145-188 (Original Edition: John, J.E.A., Haberman, W.L. (1980), Introduction to Fluid Mechanics, 2nd Edition).

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