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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 15, Issue 6 - Nov 2013
Volume 15, Issue 5 - Sep 2013
Volume 15, Issue 4 - Jul 2013
Volume 15, Issue 3 - May 2013
Volume 15, Issue 2 - Mar 2013
Volume 15, Issue 1 - Jan 2013
Selecting the target year
Analysis on the characteristics of the earth pressure distribution induced by the integrated steel pipe-roof construction
Sim, Youngjong ; Jin, Kyu-Nam ; Song, Ki-Il ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 455~468
DOI : 10.9711/KTAJ.2013.15.5.455
In recent, various types of steel pipe-roof methods, which is reinforced by mortar after propulsion of steel pipe into the ground, have been used for the construction of trenchless underpass. Integrated steel pipe-roof has flexural stiffness and can resist against overburden load and reduce the stress acting on the concrete underpass structures. Due to arching effect, vertical and horizontal stress distribution around the steel pipe-roof is changing. In this study, therefore, the characteristic of stress distribution around the underpass induced by the construction of integrated steel pipe-roof is investigated by using numerical method. To examine the soil-structure interaction, interface element is introduced. Results show that vertical stress acting on the concrete structure placing inside the steel pipe-roof is significantly reduced due to arching effect and flexural stiffness of integrated steel pipe-roof. Design load can be reduced and effective design of underpass will be available if the earth pressure reduction due to arching effect is considered in the design stage.
Monitoring of waterjet cutting free surface using laser sensor
Oh, Tae-Min ; Hong, Chang-Ho ; Cho, Gye-Chun ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 469~481
DOI : 10.9711/KTAJ.2013.15.5.469
The monitoring of a free surface generated by waterjet cutting technology is very important for an efficient construction process. In this study, experiments using a laser sensor were performed to provide a data processing method and to determine optimized parameters. The experimental parameters here are the angular resolution, measurement distance, and free surface cutting shape. The results show that the monitoring resolution increases with a decrease in the angular resolution and the horizontal measurement distance and with an increase in the cutting (free surface) width. This laser monitoring method can be applied during the measurement of free surface shapes and depths in situ.
Simulation of shield TBM tunneling in soft ground by laboratory model test
Han, Myeong-Sik ; Kim, Young-Joon ; Shin, Il-Jae ; Lee, Yong-Joo ; Shin, Yong-Suk ; Kim, Sang-Hwan ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 483~496
DOI : 10.9711/KTAJ.2013.15.5.483
This paper presents the shield TBM technology in soft ground tunnelling. In order to perform this study, a scale model test was carried out using the developed small scaled shield TBM machine. The various instrumentations were conducted during the simulation of tunnelling. In addition, the ground behavior due to the shield TBM operation parameters was measured during the simulation. Based on the simulation results, the stability of the ground was evaluated and the fundamental shield TBM tunnelling technique in the soft ground was suggested. In conclusion, design`s reliability through laboratory small scale model test about Shield-TBM section was obtained, and both the improvement plan for safety during construction and the construction plan for securing airport runway`s safety during tunnel passing by Shield-TBM propulsion were suggested.
A study on effects of landscape design of road tunnel portal to interior lighting of tunnels
Lee, Mi-Ae ; Lee, Dong-Hee ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 497~504
DOI : 10.9711/KTAJ.2013.15.5.497
This research uses numerical analysis to examine the tunnel portal landscape affecting the brightness level of interior lighting when designing lights for road tunnels through the L20 method. In order to extract the brightness recognition per form of a tunnel entrance and to evaluate the effects of the characteristics of the materials of facilities near a tunnel portal, brightness analysis was conducted by filming brightness on a video photometer called Hi-land Elf System, and a surface brightness photometer called LMK Mobile Advanced. Tunnels in Korea are mostly distributed in mountain areas; thus, the ratio occupied by the sky, which has the highest brightness within the angle of L20, is close to zero, while most of the ratio was occupied by brightness by the area near the tunnel entrance or road surface. However, for a tunnel portal retaing wall, which allows the width of a tunnel entrance to seem wider within the L20 angle, appeared to be have higher brightness compared to nearby areas or the surface, which is an element increasing the tunnel portal brightness within the tunnel, and the road facilities near the tunnel portal appeared to have an effect on the brightness as well. Thus, when designing tunnel lights based on brightness, the form of the tunnel entrance and the area width, material, and color of areas near the tunnel portal appeared to affect outside brightness and become an element affecting the establishment of the brightness level of the interior lights of tunnels. Consequently, reviewing such matters is a prerequisite when designing tunnel portal landscape.
Quantitative evaluation of collapse hazard levels of tunnel faces by interlinked consideration of face mapping, design and construction data: focused on adaptive weights
Shin, Hyu-Soung ; Lee, Seung-Soo ; Kim, Kwang-Yeom ; Bae, Gyu-Jin ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 505~522
DOI : 10.9711/KTAJ.2013.15.5.505
Previously, a new concept of indexing methodology has been proposed for quantitative assessment of tunnel collapse hazard level at each tunnel face with respect to the given geological data, design condition and the corresponding construction activity (Shin et al, 2009a). In this paper, `linear` model, in which weights of influence factors are invariable, and `non-linear` model, in which weights of influence factors are variable, are taken into account with some examples. Then, the `non-linear` model is validated by using 100 tunnel collapse cases. It appears that `non-linear` model allows us to have adapted weight values of influence factors to characteristics of given tunnel site. In order to make a better understanding and help for an effective use of the system, a series of operating processes of the system are built up. Then, by following the processes, the system is applied to a real-life tunnel project in very weak and varying ground conditions. Through this approach, it would be quite apparent that the tunnel collapse hazard indices are determined by well interlinked consideration of face mapping data as well as design/construction data. The calculated indices seem to be in good agreement with available electric resistivity distribution and design/construction status. In addition, This approach could enhance effective usage of face mapping data and lead timely and well corresponding field reactions to situation of weak tunnel faces.
Management and concept of the monitoring system considering the characteristics of subsea tunnels
Park, Eui-Seob ; Shin, Hee-Soon ; Cheon, Dae-Sung ; Jung, Yong-Bok ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 523~536
DOI : 10.9711/KTAJ.2013.15.5.523
In order to ensure the safety of the subsea tunnel during its construction and operation, unlike the underground structures on land, the special monitoring system is essential which considers the characteristics of subsea tunnels in addition to conventional stress and displacement measurements applied to existing land tunnels. Therefore, the concept applied to NATM is reorganized to evaluate the stability of subsea tunnels. And the observation system for making a monitoring plan, the critical strain theory for tunnel safety management and MS monitoring methods for detecting the local failure and crack initiation of rock and supports, are introduced. Finally, the scheme of monitoring and management for subsea tunnels by using these methods is suggested.
Behavior and pillar stability of enlarged existing parallel tunnels
Lee, Myeong-Han ; Kim, Bumjoo ; Jang, Yeon-Soo ; Yun, Ji-Nam ; Park, Hyun-Gon ;
Journal of Korean Tunnelling and Underground Space Association, volume 15, issue 5, 2013, Pages 537~546
DOI : 10.9711/KTAJ.2013.15.5.537
Traffic congestion in existing tunnels has increased due to increased traffic volume and enlarged vehicles. Enlarging existing tunnels has advantages over constructing new tunnels by reducing land purchasing costs as well as minimizing natural environment destruction. In fact, many overseas projects for enlarging existing tunnels have been reported. Thus, it appears that the demand on enlarging existing tunnels continues to rise in Korea in near future. Nonetheless, the studies related to the enlarged tunnels have been relatively rare since there have been few tunnel enlargement projects in Korea. In the present study, the tunnel behavior and the stability of rock pillar when enlarging existing parallel tunnels were investigated by performing FE analysis and using existing theory and empirical relationships. Four different enlarging cases, depending on the enlargement types and directions, were examined in the study. According to the results, for the tunnels with the same pillar width after enlarged, the uni-laterally enlarged tunnel indicated 5 to 20% higher crown settlement compared to the bi-laterally enlarged tunnel, and for the tunnel with the narrowest pillar, the highest shotcrete stress was observed. Also, the strength/stress ratio for rock pillar was more than 1.0 for all four enlargement cases, and the Matsuda`s method was found to give higher strength/stress ratio by about 50% compared to the Peck`s method.