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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.20 No.2

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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





& (2018). The estimation of the wall friction coefficient in tunnels by in-situ measurement. (사)한국터널지하공간학회, 20(2), 405-421, https://doi.org/10.9711/KTAJ.2018.20.2.405

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

Reference

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