- Volume 20 Issue 2
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The estimation of the wall friction coefficient in tunnels by in-situ measurement
현장측정을 통한 터널 내 벽면마찰계수 추정 연구
- Kim, Hyo-Gyu (Jusung G&B Inc.) ;
- Choi, Pan-Gyu (Jusung G&B Inc.) ;
- Lee, Ho-Hyung (Jusung G&B Inc.) ;
- Baek, Doo-San (Jusung G&B Inc.) ;
- Na, Kwang-Hoon (Eum Engineering Inc.)
- Received : 2018.02.01
- Accepted : 2018.02.26
- Published : 2018.03.31
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.
Grant : 대심도 복층터널 설계 및 시공기술개발
Supported by : 국토교통과학기술진흥원
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