Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Tunnel and Underground Space
Journal Basic Information
Journal DOI :
Korean Society for Rock Mechanics
Editor in Chief :
Volume & Issues
Volume 23, Issue 6 - Dec 2013
Volume 23, Issue 5 - Oct 2013
Volume 23, Issue 4 - Aug 2013
Volume 23, Issue 3 - Jun 2013
Volume 23, Issue 2 - Apr 2013
Volume 23, Issue 1 - Feb 2013
Selecting the target year
Development of the 3-D Fracture Network Analysis and Visualization Software Modules
Noh, Young-Hwan ; Choi, Yosoon ; Um, Jeong-Gi ; Hwang, Sukyeon ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 261~270
DOI : 10.7474/TUS.2013.23.4.261
As part of the development of the 3-D geologic modeling software, this study addresses on new development of software modules that can perform the analysis and visualization of the fracture network system in 3-D. The developed software modules, such as BOUNDARY, DISK3D, FNTWK3D, CSECT and BDM, are coded on Microsoft Visual Studio platform using the MFC and OpenGL library supported by C++ program language. Each module plays a role in construction of analysis domain, visualization of fracture geometry in 3-D, calculation of equivalent pipes, production of cross-section map and management of borehole data, respectively. The developed software modules for analysis and visualization of the 3-D fracture network system can be used to tackle the geomechanical problems related to strength, deformability and hydraulic behaviors of the fractured rock masses. All these benefits will further enhance the economic competitiveness of the domestic software industry.
Trend Analysis of Drilling Technology for Top-Hammer Drilling Machine
Song, Chang-Heon ; Kwon, Ki-Beom ; Shin, Dae-Young ; Hwang, Woon-Kyu ; Lim, Jong-Hyuk ; Cho, Jung-Woo ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 271~279
DOI : 10.7474/TUS.2013.23.4.271
This report introduced the types of drilling equipment and their operation mechanisms. The state of the art technologies of the Top-hammer drill equipment were investigated and the technology level of Korean drill industry was compared to that of the advanced country. Based on the investigation, the necessity of fusion research and development in the Korean drilling technology and industry was discussed, and the future strategy to catch up with the advanced technology was suggested.
Analysis of Whole Tunnel Stability by Using Rock Mass Classification and Mohr-Coulomb Analytical Solution
Jung, Yong-Bok ; Park, Eui-Seob ; Ryu, Dong-Woo ; Cheon, Dae-Sung ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 280~287
DOI : 10.7474/TUS.2013.23.4.280
Finite element or difference methods are applied to the analysis of the tunnel stability and they provide detailed behaviour of analyzed tunnel sections but it is rather inefficient to analyze all the section of tunnel by using these methods. In this study, the authors suggest a new stability analysis method for whole tunnel to provide an efficient and easy way to understand the behaviour of whole tunnel by using an analytical solution with the assumption of equivalent circular tunnel. The mechanical behaviour, radial strain and plastic zone radius of whole tunnel were analyzed and appropriate support pressure to maintain the displacement within the allowable limit was suggested after the application of this method to the tunnel. Consequently, it was confirmed that this method can provide quick analysis of the whole tunnel stability and the quantitative information for subsequent measures such as selection of tunnel sections for detailed numerical analysis, set up of the monitoring plan, and so on.
A Study on Thermodynamic Natural Ventilation Analysis by the Field Survey of Underground Mines in Korea
Yu, Yeong-Seok ; Roh, Jang-Hoon ; Kim, Jin ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 288~296
DOI : 10.7474/TUS.2013.23.4.288
In this study, a total of 13 mines were finally selected as study subjects and field measurements were conducted. Thereafter, calculations of thermodynamic natural ventilation were attempted using spread sheets and solutions for natural ventilation of mine types with multiple vertical shafts were obtained. Based on the results, natural ventilation of each mine was quantified. In addition, changes in natural ventilation energy (NVE) and natural ventilation pressure (NVP) were estimated assuming mine deepening and the resultant values were applied to mine conditions to observe changes in flow rates. Natural ventilation pressure in domestic mines is generally calculated to be in a range of 5 Pa~300 Pa. Although NVP increases as the depth increases, resistance also increases. Therefore, as the depth increases, flow rates show a tendency of converging on a certain value because of the relationship between NVP and mine resistance. Natural ventilation using shafts with depth differences is effective up to depths of 200~300 m. However, flow rate change rates resulting from NVP are small at depths deeper than approximately 200~300 m. Therefore, if a mine is deepened over 300 m, NVP will become insufficient and thus additional pressure obtained through mechanical ventilation will be necessary.
A Study on the Temperature Distribution of Rock Mass at KAERI Underground Research Tunnel: Verification on the Result of Borehole Heater Test
Yoon, Chan-Hoon ; Choi, Young-Chul ; Kwon, Sang-Ki ; Choi, Heui-Joo ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 297~307
DOI : 10.7474/TUS.2013.23.4.297
In this study, the thermal analysis is carried out for a result of borehole heater test using ABAQUS ver 6.10 based on finite element analysis code. Thermal-mechanical rock properties as determined by laboratory tests before the in situ test and characteristics of the atmosphere at the test section are used as the initial condition. When comparing the results of the in situ test and thermal analysis, the temperature of C3 observation hole that is 0.9 m away from the heater showed very similar patterns and figures (about
difference). But the results of the A and B observation hole showed a significant difference around
. To find the reason for these results, the over-coring is carried out for the A1 and B1 observation holes. As a result of checking the excavated rock core with the naked eye, there is no problem on the number and position of the sensor as the test plan. However the state of cement injection in the observation hole is poor.
Thermal Stratification and Heat Loss in Underground Thermal Storage Caverns with Different Aspect Ratios and Storage Volumes
Park, Dohyun ; Ryu, Dong-Woo ; Choi, Byung-Hee ; Sunwoo, Choon ; Han, Kong-Chang ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 308~318
DOI : 10.7474/TUS.2013.23.4.308
Thermal stratification in heat stores is essential to improve the efficiency of energy storage systems and deliver more useful energy on demand. It is generally well known that the degree of thermal stratification in heat stores varies depending on the aspect ratio (the height-to-width ratio) and size of the stores. The present study aims to investigate the effect of the aspect ratio and storage volume of rock caverns for storing hot water on thermal stratification in the caverns and heat loss to the surroundings. Heat transfer simulations using a computational fluid dynamics code, FLUENT were performed at different aspect ratios and storage volumes of rock caverns. The variation of thermal stratification with respect to time was examined using an index to quantify the degree of stratification, and the heat loss to the surroundings was evaluated. The results of the numerical simulations demonstrated that the thermal stratification in rock caverns was improved by increasing the aspect ratio, but this effect was not remarkable beyond an aspect ratio of 3-4. When the storage volume of rock caverns was large, a higher thermal stratification was maintained for a relatively longer time compared to caverns with a small storage volume, but the difference in thermal stratification between the two cases tended to decrease as the aspect ratio became larger. In addition, the numerical results showed that the heat loss to the surrounding rock tended to increase with an increase in aspect ratio because the surface area of rock caverns increased as the aspect ratio became larger. The total heat loss from multiple small caverns with a reduced storage volume per cavern was larger compared to a single cavern with the same total storage volume as that of the multiple caverns.
Risk Assessment with the Development of CAES (Compressed Air Energy Storage) Underground Storage Cavern
Yoon, Yong-Kyun ; Seo, Saem-Mul ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 23, issue 4, 2013, Pages 319~325
DOI : 10.7474/TUS.2013.23.4.319
The objective of this study is to assess risks which might occur in connection with the storage of the highly compressed air in underground opening. Risk factors were selected throughout literature survey and analysis for the characteristic of CAES. Large risk factors were categorized in three components; planning and design phase, construction phase, and operation & maintenance phases. Large category was composed of 8 medium risk groups and 24 sub-risks. AHP technique was applied in order to analyze the questionnaires answered by experts and high-risk factors were selected by evaluating the relative importance of risks. AHP analysis showed that the operation & maintenance phases are the highest risk group among three components of large category and the highest risk group of eight medium risk groups is risk associated with the quality and safety. Risk having the highest risk level in 24 sub-risks is evaluated to be a failure of tightness security of inner containment storing compressed air.