• Magazine of korean Tunnelling and Underground Space Association
• /
• v.23 no.1
• /
• pp.81-99
• /
• 2021

• Magazine of korean Tunnelling and Underground Space Association
• /
• v.24 no.3
• /
• pp.5-19
• /
• 2022

• Magazine of korean Tunnelling and Underground Space Association
• /
• v.26 no.2
• /
• pp.11-21
• /
• 2024

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.12 no.3
• /
• pp.215-222
• /
• 2010

An experimental study was carried out on a reduced scale model tunnel to investigate the efficiency of disaster prevention at underground and ground ventilation equipments for the fire in road tunnels. Based on Froude modeling, the 1/50 scaled model tunnel (20 m long) was manufactured. The vertical shafts that are used in the analysis of efficiency of disaster prevention are the two models that had considered when the real tunnels are designed and the amounts of smoke exhaust are applied the miniature of the real tunnels' smoke exhaust, 560 and $280\;m^3/s$. As the result of analysis, it is the possible the emissions of the entire quantity of CO gas through the vertical shafts. In the ground ventilation equipments, the concentration of CO is discharged 2.23~2,73 ppm smaller than the underground ventilation equipments. And the temperature rise in the ground ventilation equipments is $0.53{\sim}0.94^{\circ}C$ lower than in the underground ventilation equipments because of a cooling effect of the surface of the tunnel wall. As a result of analysis of CO concentration and the temperature rise in the modeling ventilation equipment, the position of ground ventilation equipment is more effective than the underground ventilation equipment in disaster prevention measures.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.23 no.1
• /
• pp.37-45
• /
• 2021

The construction of the tunnel portal should be careful because cover depth is shallow and it is difficult to exhibit the arching effect. Tunnel stability may be reduced with additional embankment above the portal of tunnel. In this study, in order to examine the stability of the tunnel according to additional embankment above the portal of tunnel, numerical analysis was performed while changing the ground conditions and height of embankment. As a result of the numerical analysis, it was found that the allowable flexural compressive stress of shotcrete and allowable axial force of rockbolts were exceeded when the height of additional embankment was 12 m in rock mass rating V. When considering the displacement, the range of the plastic region and the behavior of the support materials, the tunnel stability seems to be greatly reduced if the height of additional embankment above the portal of tunnel exceeds 10 m.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.04a
• /
• pp.713-716
• /
• 2008

This study is performed to propose a standard to evaluate fire protection assessment for concrete structures during a fire on road tunnel. Recently, a number of road tunnels have been rapidly increased and fire risk also multiplyed according to extend tunnel length, due to natural features and environmentally-friendly road construction in domestic. But we have not yet been prescribed appropriate time-temperature curve for tunnel fire. Therefore we presented fire design model and investigated time-temperature curve proposed by a foreign country considering traffic, a kinds of vehicles which are a basis of heat rate.

• 도로교통
• /
• s.100
• /
• pp.107-114
• /
• 2005

• 한국도로학회지:도로
• /
• v.3 no.3 s.9
• /
• pp.50-55
• /
• 2001

• Magazine of korean Tunnelling and Underground Space Association
• /
• v.25 no.1
• /
• pp.73-76
• /
• 2023

• Journal of the Korean GEO-environmental Society
• /
• v.9 no.7
• /
• pp.25-35
• /
• 2008

In domestic cases, the standard support pattern of 2-lanes road tunnels is presented because construction experience and high degree various data was abundant. But, it is not desirable to apply standard for 2-Arch tunnels that the precedent and measuring data is insufficient existing support pattern blasting plan and interpretation of separate way concerning specific terrain and rock quality. In this study, behavior according to load distribution ratio and Unsymmetrical Pressure about standard support pattern which is applied in design and construction of 2-arch tunnels was analysed and the examination of blasting vibration has influence on the center wall is conducted as a consequence reasonableness of support whether or not with presumed support pressure and ground reaction curve method. In result appropriateness of standard support pattern, support quantity is proper but considers specific terrain and rock quality condition when design and construction of further step 2-arch tunnel standard support pattern must be decided by considering terrains, soil properties and construction condition of the objective tunnel.