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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 16, Issue 6 - Nov 2014
Volume 16, Issue 5 - Sep 2014
Volume 16, Issue 4 - Jul 2014
Volume 16, Issue 3 - May 2014
Volume 16, Issue 2 - Mar 2014
Volume 16, Issue 1 - Jan 2014
Selecting the target year
Selection of concrete lining corrosion protection method for large sewer tunnels
Moon, Joon-Shik ; Lee, Sungjune ;
Journal of Korean Tunnelling and Underground Space Association, volume 16, issue 4, 2014, Pages 347~360
DOI : 10.9711/KTAJ.2014.16.4.347
Recently construction of large sewer tunnels used also as underground sluiceways/storages is increasing in order to prevent urban inundation, untreated sewage flow into rivers from combined sewer overflows and consequential river pollution due to climate change. Most of these large sewer tunnels are constructed with concrete and the concrete lining should be protected from corrosion caused by hydrogen sulfide(
). This paper introduced popular concrete corrosion protection methods for large sewer tunnels with 100-plus years of life cycle, and pros and cons of each corrosion protection methods were described by giving specific examples. However, it is difficult to objectively assess corrosion protection alternatives because of insufficient track record of corrosion protection methods applied to large sewer tunnels. In this paper, the evaluation process for selecting a corrosion protection alternative was introduced for large sewer tunnels using a case study.
Prediction of fault zone ahead of tunnel face using x-Rs control chart analysis for crown settlement
Yun, Hyun-Seok ; Seo, Yong-Seok ; Kim, Kwang-Yeom ;
Journal of Korean Tunnelling and Underground Space Association, volume 16, issue 4, 2014, Pages 361~372
DOI : 10.9711/KTAJ.2014.16.4.361
A measurement of tunnel displacement plays an important role for stability analysis and prediction of possible fault zone ahead of tunnel face. In this study, we evaluated characteristics of tunnel behaviour due to the existence and orientation of fault zone based on 3-dimensional finite element numerical analysis. The crown settlement representing tunnel behaviour is acquired at 5 m away from tunnel face in combination with x-Rs control chart analysis based on statistics for trend line and L/C (longitudinal/crown displacement) ratio in order to propose risk management method for fault zone. As a result, x-Rs control chart analysis can enable to predict fault zone in terms of existence and orientation in tunnelling.
Deformation behavior of tunnels crossing weak zone during excavation - numerical investigation
Yoo, Chungsik ; Park, Jung-Gyu ;
Journal of Korean Tunnelling and Underground Space Association, volume 16, issue 4, 2014, Pages 373~386
DOI : 10.9711/KTAJ.2014.16.4.373
This paper concerns the deformation behavior of tunnels crossing weak zone during excavation. A three dimensional finite element model was adopted in order to conduct a parametric study on the orientation of weaj zone in terms of strike and dip angle relative to the tunnel longitudinal axis. The results of the analyses were then analyzed so that the tunnel displacements in terms of the ratios between the crown settlement and springline displacement can be related to the orientation of the weak zone. The results indicate that the displacement ratios between the tunnel crown and springline tend to quantitatively change when a weak zone exists near or ahead of the tunnel suggesting that the displacement ratios can be effectively used to predict the weak zone during tunnelling. Practical implications of the findings are discussed.
Analysis of ground behavior for model tunnel excavation with pipe roof reinforcement using close range photogrammetric technique
Lee, Jung-Hwan ; Lee, Yong-Joo ;
Journal of Korean Tunnelling and Underground Space Association, volume 16, issue 4, 2014, Pages 387~402
DOI : 10.9711/KTAJ.2014.16.4.387
In congested urban areas, constructions of tunnel structures have became necessary due to a lack of surface space. The excavation of any tunnel generated the ground disturbances of surrounding ground and displacements is major concern. Therefore, a study of tunnel stability is necessary. In this study, the authors have investigated the stability and failure pattern of tunnel through the model tunnel test. In this study, the close range photogrammetry was used to measure the ground deformation. The measured data was converted to displacement vectors and contours. And then it compared to FE analysis and empirical formula. In addition, this study presented the comparison between steel pipe reinforced model tunnel and unreinforced model tunnel. The ground deformation for both the steel pipe reinforced model tunnel and the unreinforced model tunnel was analysed.
The study on the effect of fracture zone and its orientation on the behavior of shield TBM cable tunnel
Cho, Won-Sub ; Song, Ki-Il ; Kim, Kyoung-Yul ;
Journal of Korean Tunnelling and Underground Space Association, volume 16, issue 4, 2014, Pages 403~415
DOI : 10.9711/KTAJ.2014.16.4.403
Recently, the temperature rise in the summer due to climate change, power usage is increasing rapidly. As a result, power generation facilities have been newly completed and the need for ultra-high-voltage transmission line for power transmission of electricity to the urban area has increased. The mechanized tunnelling method using a shield TBM have an advantage that it can minimize vibrations transmitted to the ground and ground subsidence as compared with the conventional tunnelling method. Despite the popularity of shield TBM for cable tunnel construction, study on the mechanical behavior of cable tunnel driven by shield TBM is insufficient. Thus, in this study, the effect of fractured zone ahead of tunnel face on the mechanical behavior of the shield TBM cable tunnel is investigated. In addition, it is intended to compare the behavior characteristics of the fractured zone with continuous model and applying the interface elements. Tunnelling with shield TBM is simulated using 3D FEM. According to the change of the direction and magnitude of the fractured zone, Sectional forces such as axial force, shear force and bending moment are monitored and vertical displacement at the ground surface is measured. Based on the stability analysis with the results obtained from the numerical analysis, it is possible to predict fractured zone ahead of the shield TBM and ensure the stability of the tunnel structure.
Influencing factors for abrasive flow rate and abrasive flow quality of abrasive injection waterjet systems for tunnel excavation
Joo, Gun-Wook ; Oh, Tae-Min ; Cho, Gye-Chun ;
Journal of Korean Tunnelling and Underground Space Association, volume 16, issue 4, 2014, Pages 417~430
DOI : 10.9711/KTAJ.2014.16.4.417
A new rock excavation method using an abrasive waterjet system is under development for efficiently creating tunnels and underground spaces in urban areas. In addition, an appropriate abrasive flow rate and abrasive flow quality are important for the new rock excavation (cutting) method using an abrasive waterjet system. This study evaluated the factors influencing the abrasive flow rate and abrasive flow quality, specifically the abrasive pipe height, length, tortuosity and inner diameter, through experimental tests. Based on the experimental test results, this study suggested optimal conditions for the abrasive flow rate and abrasive flow quality. The experimental results can be effectively utilized as baseline data for rock excavation methods using an abrasive waterjet system in various construction locations such as tunnels near urban surroundings, utility tunnels, and shafts.