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 18, Issue 6 - Dec 2008
Volume 18, Issue 5 - Oct 2008
Volume 18, Issue 4 - Aug 2008
Volume 18, Issue 3 - Jun 2008
Volume 18, Issue 2 - Apr 2008
Volume 18, Issue 1 - Feb 2008
Selecting the target year
A Basic Study for Mechanical Properties of Domestic Rocks and Database Construction
Cheon, Dae-Sung ; Park, Eui-Seob ; Park, Chul-Whan ; Park, Chan ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 317~327
About 70% of domestic land is mountainous and the construction of many geotechnical structures is inevitable for building transportation networks across region. Many geotechnical surveys, including rock physical and mechanical tests, are performed during construction. Thus study is a basic research for establishing database of physical and mechanical properties in domestic rocks, and analyzing the rock mechanical relationships between 2,000 rock properties obtained from laboratory tests in KOLAS. For the construction of useful database, systematic management, based on the standard information as well as reliable data accumulation, is required.
Numerical Evaluation of Excavation Damage Zone Around Tunnels by Using Voronoi Joint Models
Park, Eui-Seob ; Martin, C. Derek ; Synn, Joong-Ho ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 328~337
Quantifying the extent and characteristics of the excavation damage zone(EDZ) is important for the nuclear waste industry which relies on the sealing of underground openings to minimize the risk for radionuclide transport. At AECL's Underground Research Laboratory(URL) the Tunnel Sealing Experiment(TSX) was conducted and the tunnel geometry and orientation relative to the stress field had been selected to minimize the potential for the development of an EDZ. The extent and characteristics of the EDZ was measured using velocity profiling and permeability measurements in radial boreholes. The results from this EDZ characterization are used in this paper to evaluate a modeling fir estimating the extent of the EDZ. The methodology used a damage model formulated in the Universal Distinct Element Code and calibrated to laboratory properties. This model was then used to predict the extent of crack initiation and growth around the TSX tunnel and the results compared to the measured damage. The development of the damage zone in the numerical model was found to be in good agreement with the field measurements.
Longitudinal Deformation Profile in Tunnel using Measured Data
Jang, Won-Yil ; Yang, Hyung-Sik ; Chung, So-Keul ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 338~342
Longitudinal deformation profile(LDP) has been obtained mostly by numerical analysis. In this study, LDP was plotted by measured data from horizontal inclinometer and crown settlement. Deformation of foe ahead was determined by comparing to the maximum deformation point and deformation of after excavation was determined by regression of the measured crown settlement data. The result shows that crown deformation began as f3r as 3D ahead of the face. Crown settlement at the face was 40% of ultimate deformation, which was 10% higher than numerical results, and the deformation converged after excavation of 4D.
A Novel Method for In Situ Stress Measurement by Cryogenic Thermal Cracking - Concept Theory and Numerical Simulation
Ryu, Chang-Ha ; Ryu, Dong-Woo ; Choi, Byung-Hee ; Synn, Dong-Ho ; Loui, John P. ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 343~354
A new method is suggested herein to measure the virgin earth stresses by means of a borehole. This novel concept is basically a combination of borehole stress relieving and borehole fracturing techniques. The destressing of the borehole is achieved by means of inducing thermal tensile stresses at the borehole periphery by using a cryogenic fluid such as Liquid Nitrogen(
). The borehole wall eventually develops fractures when the induced thermal stresses exceed the existing compressive stresses at the borehole periphery in addition to the tensile strength of the rock. The above concept is theoretically analyzed for its potential applicability to interpret in situ stress levels from the tensile fracture stresses and the corresponding borehole wall temperatures. Coupled thermo-mechanical numerical simulations are also conducted using FLAC3D, with thermal option, to check the validity of the proposed techniques. From the preliminary theoretical and numerical analysis, the method suggested for the measurement of in situ stresses appears to be capable of accurate estimation of the virgin stresses by monitoring tensile crack formation at a borehole wall and recording the wall temperatures at the time of crack initiation.
Prediction of Preceding Displacement of a Soil-Tunnel by Displacement Monitoring using Horizontal Inclinometer
Kim, Chu-Hwa ; Chae, Young-Su ; Park, Yeon-Jun ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 355~365
Displacement caused by tunneling is difficult to predict since it is affected by many factors such as ground condition, excavation method and supplementary method of reinforcement. In this study, horizontal inclinometer was employed to monitor ground settlements above a tunnel face before and after the excavation. Monitoring results were analyzed to predict the preceding displacement and settlement of the surface structures. The result of the analysis can be used to establish a proper counter measure which keeps the serviceability of the surface structures. Based on the analysis of the monitoring result, ground properties of the site were deduced and the influence of the tunnel excavation on the settlement of the foundation above the tunnel is analyzed.
A Numerical Analysis: Effects of Hydraulic Characteristics of a Hazardous Zone on the Face Stability in Subsea Tunnelling
Hong, Eun-Soo ; Park, Eui-Seob ; Shin, Hee-Soon ; Kim, Hyung-Mok ; Ryu, Dong-Woo ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 366~374
Tunnelling under water table induces many geotechnical problems because of groundwater. In subsea tunneling, reduction of face stability can induce flooding in the vicinity of a fracture zone characterized by high permeability and high water pressure. In this study, the effects of high water pressure on the stability of a tunnel face in a limited zone with high permeability(hazardous zone) are analyzed. On the basis of the 'advance core' concept, the seepage force acting on a hypothetical cylinder ahead of a tunnel face is modeled. This study focuses on the hydraulic behavior of the ground ahead of the tunnel face by three-dimensional steady-state seepage analyses. The impact of the hazardous zone on the seepage force and stability of the tunnel face are simulated and analyzed. In light of the analysis results, it is estimated that the distance from the tunnel face to the exterior boundary limit, which the seepage force significantly affects the stability of the tunnel face, of a hypothetical cylinder is approximately 5 times the tunnel radii. Despite the restrictive assumptions of this study, the results are highly indicative regarding the risks of hazardous zones.
Hydraulic Analysis of Tailing Dam using GIS
Song, Won-Jyong ; Heo, Sung ; Kim, Tae-Heok ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 375~385
Hydraulic analysis in a dam that has a single outlet of water can be made through a simple comparison between the total precipitation and the volume of discharged water. In case of tailing dams this estimation could yield an error because several drainage facilities are worked independently as well as simultaneously. In this research, a capability of the drainage system in the tailing dam of the old Sangdong Mine was analysed by the means of GIS technic. As a result of this study, it was expected that in the normal working condition of the whole drainage system, the flooding of water over the dam should not occur in spite of the consecutive precipitation during one hour with an intensity of 80.31 mm/hr, a probable precipitation within 100 years. It was, however, revealed that, if the drainage system did not work completely, the water could flood over the dam when the total precipitation reached 251.1 mm.
A Study on the Characteristics of Dynamic Elastic Modulus in Granite
Lee, Byok-Kyu ; Lee, Su-Gon ; Lim, Bak-Man ;
Tunnel and Underground Space, volume 18, issue 5, 2008, Pages 386~392
Recently, an earthquake-resistant has become essential to the large-scale structures at Gyeonggi and Gyeongsangnam province in Korea, but it is generally compared the measured data with foreign references because of the lack of the research data. It will be presented the characteristics of suitable dynamic elastic modulus in Korean geology, which characteristics are characterized the seismic wave velocities(
) and correlation with dynamic elastic modulus(
) by each rock type of Korean granite, because it is very different between the values of foreign references and Korean geological characteristics.