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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
Numerical study for the optimum grouting design of subsea tunnels
Joo, Eun-Jung ; Kim, Yong-Kye ; Shin, Jong-Ho ; Kwon, Oh-Yeob ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 5, 2010, Pages 349~358
In the long-term, most tunnels suffer from the increase in ground water inflow and in pore water pressure on the lining. To reduce such hydraulic effect, generally grouting methods are adopted. In this paper effective grouting design is proposed based on numerical simulation. To investigate the optimal grouting layout, factors such as relative permeability, grouting thickness, and distance from the lining are considered. The results are analysed in terms of pore water pressure, inflow rate, and earth pressure. It is revealed that the pore water pressure has increased with a decrease in grout permeability, an increase in grouting thickness and an increase in grouting distance. Meanwhile the inflow rate has decreased with a decrease in grout permeability and is inversely proportional to grouting thickness. Effective grouting design guideline are proposed based on this study.
A comparative analysis of prediction and measurement for reinforcement effect of face bolts
Seo, Kyoung-Won ; Kim, Woong-Ku ; Baek, Ki-Hyun ; Kim, Jin-Woung ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 5, 2010, Pages 359~368
Unlike in Korea where steel pipe-reinforced multistep grouting is of commonly used methods for tunnel reinforcement, face bolt method is more widely used due to its better workability and lower construction cost in other countries. In this paper, the effects of both methods after tunnel failure were numerically analyzed and verified based on the oversea construction experiences. As a result it is concluded that the face bolt method may be effective to reinforcement especially when there are some fractured zones developed in the face of tunnel.
A study on stresses and displacements of the ground according to the closure ratio of tunnel face during tunnel excavation
Kim, Sang-Hwan ; Min, Byeong-Heon ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 5, 2010, Pages 369~378
This paper presents a new approach of closing the tunnel face with sprayed concrete to reduce the stress at the tunnel face and displacement occurring at the ground surface during tunnel excavation. In order to carry out this research, the experimental and numerical studies are performed. In the experimental study, the model tests are carried out according to the closure ratio of tunnel face, tunnel depth and tunnel excavation length. The model test results are analyzed and interpreted by numerical calculation in order to verify both results obtained from experimental and numerical studies. It is clearly found that the tunnel face stability is decreased in decreasing the closure ratio of tunnel face. The results also show that the tunnel face is stable when the closure ratio of tunnel face is larger than 80%. This research will be very useful to develop the economical tunnel face closing system.
A case study on the optimal tunnel design based on risk analysis
You, Kwang-Ho ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 5, 2010, Pages 379~387
In this study, a case study was introduced for the design of a twin tunnel along high speed national highway Route 12 from Damyang to Sungsan. It was related to determine the optimal tunnel support pattern and excavation method based on a risk analysis in order to incorporate the uncertainty of ground properties. To this end, three alternatives with different amounts of support and excavation method were selected and risk analysis was performed by applying Monte Carlo simulation technique, respectively. Stability of the tunnel was quantified by the factor of safety. To improve the result, the 729 cases of the combination of ground properties (deformation modulus, cohesion, and internal friction angle) satisfying a Gaussian distribution were generated and applied. Also, stability of the tunnel was confirmed by analyzing the distribution of both displacement and shotcrete bending stress.
The effects of stability of the tunnel reinforced by rebar steel pipe
Kim, Sang-Hwan ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 5, 2010, Pages 389~397
This paper presents the effects of the tunnel stability using rebar steel pipe which is the steel pipe reinforced by rebar. In order to carry out this research, not only the theoretical and experimental study for bending stiffness of normal steel pipes and rebar steel pipes but also numerical analysis of tunnel stability are performed. It is clearly found from the results that 65% of bending stiffness of the rebar steel pipe is larger than that of the normal steel pipe. The results obtained from the numerical analysis of tunnel stability show that about 10% of tunnel stability is increased in case of the rebar steel pipe. The rebar steel pipe, therefore, may be very useful to develope the tunnel stability economically.
Ideal body modeling of porous rock by frost-thawing
Han, Heui-Soo ; Back, Yoog ;
Journal of Korean Tunnelling and Underground Space Association, volume 12, issue 5, 2010, Pages 399~405
The accumulated displacements and fatigues of rock are increased by the stress-hysteresis, induced from repeated frost-thawing. Also the shear strength is decreased by them continuously. The stress-hysteresis is affected by the atmospheric temperature changes, whose behavior is visco-elasticity, usually. Therefore, to do ideal body analysis, Kelvin model could be used to analyze the frost-thawing behavior in winter. In general, rock slope failure occurs by the deterioration of rocks, which is caused by the repetition of freezing-thawing process. In order to keep the safety of such rock mass structures the deterioration process of rock needs to be described quantitatively using some meaningful parameters. In this work, the deterioration process in freezing-thawing cycle of tuff, which is a famous soft porous rock, is investigated through laboratory tests and successfully described as a differential equation for the change of porosity. And then, the deterioration of the mechanical properties of rock, such as Young's modulus and uniaxial compressive strength, are quantitatively described as a function of the porosity.