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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 9, Issue 4 - Dec 2007
Volume 9, Issue 3 - Sep 2007
Volume 9, Issue 2 - Jun 2007
Volume 9, Issue 1 - Mar 2007
Selecting the target year
Influence of eccentric load and lateral earth pressure on the tunnel behavior
Ahn, Hyun-Ho ; Suh, Byung-Wook ; Kim, Dong-Hyun ; Min, Dong-Ho ; Lee, Sun-Bok ; Lee, Seok-Won ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 219~228
Scaled model tests were performed to explore the influence of eccentric load and lateral earth pressure on tunnel behavior and their results were verified through numerical analyses. As a method for reducing the eccentric load acting on tunnel, an eccentric supporting system (ESS) was proposed and its applicability was investigated. Experimental results showed that displacement decreased overall and the load inducing initial cracks increased as the eccentric supporting system was applied. The maximum eccentric vertical load which impacted the stability of tunnel was also increased. The test results on the influence of lateral earth pressure on tunnel behavior showed that the general aspect of displacement and crack growth changed significantly depending on the coefficient of lateral earth pressure. In addition, the weak zone In view of stability varied as well.
Development of 3D absolute displacement monitoring system and its application at the stage of tunnel construction
Bang, Joon-Ho ; Kim, Ki-Young ; Jong, Yong-Hun ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 229~240
The 3D absolute displacement monitoring system has been developed to analyze the tunnel convergence measured under construction of underground structures and to manage effectively the measured data. The system is comprised of the total station, the anchor-typed target pin and the 3D absolute displacement measurement and management program. In this paper, the types and specifications of the 3D total station were presented. The anchor-typed target pin, an improved model of traditional one, was developed and its sightable distance and measurement accuracy were checked by field tests. Also a 3D absolute displacement measurement and management program, TEMS 3D, was developed to provide some analysis tools including the trend and influence lines. L/C ratio, S/C ratio and the like. The developed system was applied the construction stage of a railway tunnel for testing purpose. It is verified that the developed system is capable of predicting weak zones ahead of tunnel face by comparing with results of TSP (Tunnel Seismic Prediction) survey.
A remedy measure for large cavities of an existing tunnel
You, Kwang-Ho ; Park, Kwang-Joon ; Lim, Chul-Soon ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 241~250
During enlarging an existing tunnel under operation, unexpected excessive overbreaks and large cavities around the tunnel were found. It was an issue that they might influence the stability the new tunnel. The overbreaks and cavities are assumed that they were attributed to excessive blasting under the condition of insufficient ground investigation. To enlarge the existing tunnel safely, therefore, a remedy measure for the overbreaks and cavities is suggested.
Model tests for the behavior assessment of adjacent buildings in urban tunnelling
Hwang, Eui-Suk ; Kim, Hak-Moon ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 251~261
This study is to investigate the damage assessment of adjacent structures due to tunneling in urban environment. Model tests were carried out with two-story masonry building structures in various shapes and locations. The damage level of adjacent structures were very differently estimated in accordance with the shape ratio (L/h) of structures, construction stages, and various locations. The results of model tests were plotted on the damage level graphs in order to predict the direction of damage levels for the different types of structures (i.e. stiffness of structures, L/h). The progressive crack development mechanism at various construction stages was revealed through model tests and crack size indicated more conservative side of damage level on the damage level graph.
Damage-controlled test to determine the input parameters for CWFS model and its application to simulation of brittle failure
Cheon, Dae-Sung ; Park, Chan ; Jeon, Seok-Won ; Jung, Yong-Bok ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 263~273
When a tunnel or an underground structure is excavated in deep geological environments, the failure process is affected and eventually dominated by stress-induced fractures growing preferentially parallel to the excavation boundary. This fracturing is generally referred to as brittle failure by spatting and slabbing. Continuum models with traditional failure criteria such as Hoek-Brown or Mohr-Coulomb criteria have not been successful in prediction of the extent and depth of brittle failure. Instead cohesion weakening and frictional strengthening (CWFS) model is known to predict brittle failure well. In this study, CWFS model was applied to predict the brittle failure around a circular opening observed in physical model experiments. To obtain the input parameters for CWFS model, damage-controlled tests were carried out. The predicted depth and extent of brittle failure using CWFS model were compared to the results of the physical model experiment and numerical simulation using traditional model.
A study on analysis of tunnel behaviors considering the characteristics of in-situ stress distribution in rock mass
Part, Do-Hyun ; Kim, Young-Geun ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 275~286
In construction of a structure in underground space, in-situ stress in rock mass has great effect on the stability of the structure. Especially, the direction and magnitude of rock stress have influence on the excavation method, the choice of support and reinforcement method for establishing the stability of tunnel. Therefore, it is very important to consider the characteristics of in-situ stress in rock mass for tunnel stability analysis. In this study, a reasonable design method for underground structure was reviewed through the case study for tunnel design considering in-situ rock stress. For this purpose, the estimation for SRF (Stress Reduction Factor) as input parameter in rock classification using Q-System and the assesment for tunnel support were studied. Also, considering the characteristics of in-situ rock stress such as the magnitude of K and the direction of principal stress, the parameter studies for tunnel stability analysis were carried out. An improved method was proposed for obtaining the better results in the tunnel stability analysis.
A study on the estimation of safety in long railway tunnel
Kim, Young-Geun ; Kim, Dong-Hyun ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 287~298
Recently, as the construction of new railway and the relocation of existing line increase, tunnel structures get longer. The railway fire accidents in long tunnel bring large damages of human life and disaster. The interest on safety in long tunnel has been growing and the safety standard for long tunnels is tightening. For that reason, at the planning stage of a long tunnel, the optimum design of safety facility for minimizing the risks and satisfying the safety standard is required. For the reasonable design of a long railway tunnel considering high safety, qualitative estimation for tunnel safely is required. In this study, QRA (Quantitative Risk Analysis) technique is applied to design of a long railway tunnel for assuring the safety function and estimating the risk of safety. The case study for safety design was carried out to verify the QRA technique for two railway tunnels.
Development of a numerical modelling technique for evaluation of a long-term chemical deterioration of tunnel shotcrete lining
Shin, Hyu-Soung ; Kim, Dong-Gyou ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 299~307
In this study, a new concept for simulating a physical damage of tunnel shotcrete lining due to a long-term chemical deterioration has been proposed. It is known that the damage takes place mainly by internal cracks, reduction of stiffness and strength, which results mainly from volume expansion of the lining and corrosion of cement materials, respectively. This damage mechanism of shotcrete lining appears similar in most kinds of chemical reactions in tunnels. Therefore, the mechanical deterioration mechanism induced by a series of chemical reactions was generalized in this study and mathematically formulated in the framework of thermodynamics. The numerical model was implemented to a 3D finite element code, which can be used to simulate behaviour of tunnel structures undergoing external loads as well as chemical deterioration in time. A number of illustrative examples were given to show a feasibility of the model in tunnel designs.
The efface of introduction of diesel passenger cars on the ventilation requirements for road tunnels
Kim, Hyo-Gyu ; Song, Seok-Hun ; Kim, Nam-Young ; Lee, Chang-Woo ;
Journal of Korean Tunnelling and Underground Space Association, volume 9, issue 3, 2007, Pages 309~321
Since the first diesel passenger car hit the local road in late 2005, the share of diesel cars is growing significantly; possibly up to the level as in the western Europe. In this study, the effects of introduction of diesel passenger cars on the ventilation rate and facility capacity are analyzed for the three individual cases with different basic exhaust rate based on the vehicle age, the vehicle class percentage and the smoke exhaust rate. The target tunnel for this comparative study is a typical 2 km-long 2-lane highway tunnel. Case 1 assuming the current local design standards and the diesel vehicles comprising 40% of the total passenger cars on the road required more ventilation rate and facility capacity than in the case only with the current standards. Case 2 which is the real tunnel currently in the designing stage taking into account the vehicle age but ignoring the diesel vehicle ratio, and Case 3 on the contrary considering the both factors show similar level of ventilation characteristics as EURO-3 emission regulation. Application of the emission standard set by the Ministry of Environment for newly manufactured vehicles in the current local tunnel design standard indicates higher requirements than for EURO-2 regulation, whereas the emission standard came into effect in 2006 results in the ventilation characteristics similar to EURO-4. This study aims at providing fundamental information for assessing the basic emission rate and determining the optimal ventilation rate and facility capacity considering the growing percentage of diesel cars and gradually decreasing level of smoke emission forced by the relevant laws.