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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Tunnelling and Underground Space Association
Journal Basic Information
Journal DOI :
Korean Tunnelling and Underground Space Association (KTA)
Editor in Chief :
Volume & Issues
Volume 12, Issue 6 - Nov 2010
Volume 12, Issue 5 - Sep 2010
Volume 12, Issue 4 - Jul 2010
Volume 12, Issue 3 - May 2010
Volume 12, Issue 2 - Mar 2010
Volume 12, Issue 1 - Jan 2010
Selecting the target year
New tunnel reinforcement method using pressurized cavity expansion concept
Cho, In-Sung ; Park, Jeong-Jun ; Kim, Jong-Sun ; Lee, In-Mo ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 6, 2010, Pages 407~416
A new tunnel auxiliary method is proposed in this paper which utilizes the concept of cavity expansion for tuunel reinforcement by forming an umbrella arch on the roof of tunnel. When an inflatable pipe is inserted and expanded by pressure in the bore hole of umbrella arch, the ground around the bore hole can be compacted so that the stress condition above the tunnel perimeter is favorably changed. In order to verify the reinforcement effect of new concept, pilot-scale chamber test, trapdoor test and numerical analysis were performed and compared. In pilot-scale chamber test, three types of inflatable pipes are tested to verify the capability of expansion, and the results arc compared with analytical results obtained by applying cavity expansion theory and with results obtained from finite clement analysis, and the experimental results showed agreeable matches with analytical and numerical ones. Numerical analysis of a tunnel and trapdoor test applied with the inflatable pipes are also performed to figure out the reinforcement effect of the proposed techniques, and the results implied that the new method with 3 directional inflatable pipe (no pressure to downward direction) can contribute to reduce tunnel convergence and face settlement.
Longitudinal arching effect of an under-passing tunnel on the existing tunnel undergoing a load of upper structures
Lee, Yong-Jun ; Lee, Sang-Duk ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 6, 2010, Pages 417~427
In the ease that a new cross tunnel is constructed under the existing tunnel, development of a longitudinal arching would be influenced by the existing tunnel. But it is not enough to investigate. Especially, the influence of the structure loads on the ground surface on the new tunnel, which the under-passes existing tunnel has been rarely studied. This study, therefore, aimed to clarify the effect of the existing tunnel and the structure on the ground surface on the development of a longitudinal ground arching during the excavation of a cross tunnel under the existing tunnel. Two-dimensional model tests were carried out in the test box, whose dimension was 30 cm (wide)
113 cm (deep)
87 cm (high). The existing tunnel was made of S21 steel tube in 16 cm diameter and 1 mm thickness. The ground surface load was 4.9 kPa and was loaded on the model structure in the size with 30 cm width
16 cm height. New tunnel was excavated in 250 mm height by a bench cut method. As results, the longitudinal arching would be developed but it was severely influenced by not only the existing upper tunnel but also the ground surface load. The influence of the ground surface load on the development of longitudinal ground arching around a new tunnel showed the highest value when the tunnel face located direct under the surface load.
Assessment of structural fire resistance of a fire-proofed immersed tunnel under tunnel fire scenarios
Choi, Soon-Wook ; Chang, Soo-Ho ; Kim, Heung-Yon ; Jo, Bong-Hyun ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 6, 2010, Pages 429~441
In this study, fire resistance of a fireproof material sprayed upon an immersed tunnel was experimentally evaluated under
and IS0834(duration of 4 hours) fire scenarios. Under
fire scenario, the maximum inner temperatures of a concrete specimen at the depth of 0, 25 and 50 mm from the interface between the structure and the fire-proofing layer were
respectively. Similarly, the corresponding maximum temperatures under IS0834 fire scenario were
respectively. From the results, it was revealed that the two different fire scenarios assumed in this study have almost the same fire capacity as each other in the maximum temperature concept. In addition, a structural analysis of the immersed tunnel under
fire scenario was carried out to verify the effects of the fireproof material on its structural stability. Material loss and deterioration of a concrete specimen without any fire-proofing measure was also experimentally evaluated to obtain input parameters for the structural analysis under such a severe fire scenario. From the results, it was confirmed that the application of fireproof measures to the immersed tunnel is essential for its structural stability even under a severe fire scenario.
A study on behavioral characteristics of concrete lining based on the equations of relaxed rock loads
Kim, Sang-Hwan ; Park, Inn-Joon ; Moon, Hoon-Ki ; Shin, Yong-Suk ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 6, 2010, Pages 443~450
A concrete lining of NATM tunnel had been considered as interior materials. But recently we consider it as structural materials. Therefore we must consider various loads. Relaxed rock load is a main load which decides thickness and reinforcement presence of concrete lining. In practice conservatively, Terzaghi's rock load theory has been accepted to estimate relaxed rock loads in urban subway tunnel design. This study investigates the equations of relaxed rock loads used in the design of NATM concrete lining. Structural analysis are executed based on various equations of relaxed rock loads, and concrete lining forces are compared.
A numerical study on feasibility of the circled fiber reinforced polymer (FRP) panel for a tunnel lining structure
Lee, Gyu-Phil ; Shin, Hyu-Soung ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 6, 2010, Pages 451~461
Utilization of the fiber reinforced polymer (FRP) material has been enlarged as a substitution material to the general construction materials having certain long-term problems such as corrosion, etc. However, it could be difficult to apply the FRP material, which has a linear shape generally, to an arch-shaped tunnel structure. Therefore, an attempt has been made in this study to develop a device to form a designed cross section of FRP material by pulling out with a curvature. A sample of the circled FRP product was successfully produced and then the sample has been tested to identify its physical characteristics. Then, intensive feasibility studies on the circled FRP panel to be used for a tunnel lining structure have been carried out by numerical analyses. As a result, it appears that the new circled FRP-concrete composite panel has a high capability to be used for a tunnel lining material without any structural problem.
New approach on prediction of fault zone ahead of tunnel face by using
control chart for RMR parameters
Yim, Sung-Bin ; Kim, Kwang-Yeom ; Kim, Chang-Yong ; Seo, Yong-Seok ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 6, 2010, Pages 463~473
A new approach for prediction of a fault zone ahead of tunnel face by using statistical control charts is suggested and applied to the construction site.
control charts of RMR parameters were investigated as approaching and passing through fault zone. The abnormal signal from the control charts was observed and analyzed based on statistical criteria. Fault zones in the application area were predicted in advance using this method and it was verified by comparing with observation data like horizontal boring and face mapping.