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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
Mechanical evolution of radioactive waste repository and rock mass - A review on ANDRA's case -
Chung, So-Keul ; Synn, Joong-Ho ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 165~174
Thermo-hydro-chemico-mechanical evolution of the radioactive waste repository and surrounding geological media is one of the key issues for the radioactive waste disposal. This article describes not only the basic context for the site selection but also a reasonable strategy for the repository related research based on the results of the French repository project carried out by ANDRA (National radioactive waste management agency). To have some alternatives for the determination of a preferable depth and geological media, it would be recommendable to establish a database system. The curing process of the fractures or microfissures in the EDZ (Excavation Disturbed Zone) during operation time has to be examined considering the evolution of the EDZ and the reversibility of the repository. It is prerequisite to carry out a feasibility study and to validate the design concept and design parameters in a properly constructed underground research laboratory (URL) in Korea.
Greenhouse Gas (
) Geological Sequestration and Geomechanical Technology Component
Kim, Hyung-Mok ; Park, Eui-Seob ; Synn, Joong-Ho ; Park, Yong-Chan ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 175~184
In this study, state-of-the-art of
geological sequestration as a method of greenhouse gas reduction was reviewed. Thermal-Hydraulic-Mechanically(THM) coupled simulation technology and its application to a stability analysis of geological formation due to
injection as well as a leakage path analysis were investigated and introduced.
Pearson-type Chi-square Test on the Joint Orientations from Different Depths in Boreholes
Kim, Ki-Seog ; Park, Young-Do ; Park, Yeon-Jun ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 185~193
We have carried out Pearson-type chi-square tests on the orientation data of joints from different depths in order to estimate the homogeneity of joint orientations obtained from a borehole. The orientation data of joints were collected from two non-foliated massive rocks of granitic gneisses in South Korea since orientations of joints in folded metamorphic rocks, for example, are controlled by foliation and also changes as the orientations of foliation change by folding. Borehole images were used for the analysis of the orientations of individual joints. The orientation data were subdivided into the upper level data and lower level data. The data from these two levels are plotted on the patch net consisting of 21 orientation patches. Then, the two patterns on the patch net were analyzed using a contingency table. From the chi-square test on the data collected from two sites, we found that some data sets show statistically meaningful differences in orientations of joints. Since joints are one of the important parameters in determining the physical properties of rock masses, in situ investigation of joints are desirable in the geotechnical investigation and also in design of subsurface structures (e.g. tunnels and underground storages).
An Investigation of Anisotropic Tensile Strength of Transversely Isotropic Rock by Critical Plane Approach
Lee, Youn-Kyou ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 194~201
In order to investigate the characteristics in tensile strength of transversely isotropic rock, a new anisotropic tensile failure function was suggested. According to the function, the tensile strength is minimum in the normal direction to a weakness plane and rises exponentially to its maximum on a plane perpendicular to the weakness plane. The anisotropic function is defined in terms of three strength parameters which can be identified trom direct tensile tests of transversely isotropic rocks. By incorporating the suggested function into the critical plane approach, a numerical procedure which enables to search the tensile strength and the direction of critical plane at failure was presented. The validity of the suggested numerical procedure was checked through the simulation of direct tensile tests reported in a literature. The numerical results from the simulation were in good agreements with those from the laboratory tests.
A Field Application of 3D Seismic Traveltime Tomography (I) - Constitution of 3D Seismic Traveltime Tomography Algorithm -
Moon, Yoon-Sup ; Ha, Hee-Sang ; Ko, Kwang-Buem ; Kim, Ji-Soo ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 202~213
In this study, theoretical approach of 3D seismic traveltime tomography was investigated. To guarantee the successful field application of 3D tomography, appropriate control of problem associated with blind zone is pre-requisite. To overcome the velocity distortion of the reconstructed tomogram due to insufficient source-receiver array coverage, the algorithm of 3D seismic traveltime tomography based on the Fresnel volume was developed as a technique of ray-path broadening. For the successful reconstruction of velocity cube, 3D traveltime algorithm was explored and employed on the basis of 2nd order Fast Marching Method(FMM), resulting in improvement of precision and accuracy. To prove the validity and field application of this algorithm, two numerical experiments were performed for globular and layered models. The algorithm was also found to be successfully applicable to field data.
A Study on dynamic Fracturing Behavior of Anisotropic Granite by SHPB Test
Choi, Mi-Jin ; Cho, Sang-Ho ; Yang, Hyung-Sik ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 214~218
Dynamic fracturing of anisotropic granite was investigated by SHPB (Split Hopkinson Pressure Bar). Energy absorption during the test and maximum stress were increased as strain rate increased. Maximum stresses in every direction were dependent on the strain rate but not so sensitive to anisotropy. Elastic wave velocity was decreased as strain rate increased and dependent on strain rate in every direction. Especially, elastic wave velocity decreased more rapidly in a strong rock.
Thermal Conductivity of Granite from the KAERI Underground Research Tunnel Site
Cho, Won-Jin ; Kwon, Sang-Ki ; Choi, Jong-Won ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 219~225
To obtain the input data for the design and long-tenn performance assessment of a high-level waste repository, the thermal conductivities of several granite rocks which were taken from the rock cores from the declined borehole were measured. The rock specimens were sampled at the various depths from the surface, and the thermal conductivity was measured under the dry and water-saturated conditions. Under the dry condition, the thermal conductivities of the granite rocks decrease with increasing porosity and range from 2.1 W/mK to 3.1 W/mK. The water-saturated rock samples showed greater thermal conductivities than the dry samples, and the thermal conductivities of the granite rocks range from 2.9 W/mK 3.6 W/mK. The anisotropy effects on the thermal conductivity of granite of the site seem to be insignificant.
A Numerical Study on the Behavior of Shotcrete Reinforced by Various Steel Supports
Lee, Sang-Don ; Park, Yeon-Jun ; Lim, Doo-Chul ; Son, Jeong-Hun ; You, Kwang-Ho ; Kim, Su-Man ;
Tunnel and Underground Space, volume 18, issue 3, 2008, Pages 226~238
The steel ribs which are used to enhance the supporting capability of the shotcrete are estimated to be very effective, but their characteristics depending on the types of steel support are not well understood enough to be considered in the design stage. This paper describes the behavior of the shotcrete reinforced by various types of steel supports. Through flexural toughness test, major strength parameters such as flexural tensile strength, equivalent flexural tensile strength and residual tensile strength were obtained and used in the numerical analyses. Test results show that steel rebar was not as dependable as H-beam or lattice girder but close examination of the test results revealed that the specimen was failed in shear because of the shorter span than desired. Therefore tests on the properly dimensioned specimens are necessary for valid evaluation of the steel rebar reinforced shotcrete. In the first set of numerical stability analyses, shotcrete and steel supports were modelled separately. Then compared with the second set of analyses in which shotcrete and steel supports were regarded as a composite material. The two results coincided reasonably and this equivalent model turned out to be useful.