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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 21, Issue 6 - Dec 2011
Volume 21, Issue 5 - Oct 2011
Volume 21, Issue 4 - Aug 2011
Volume 21, Issue 3 - Jun 2011
Volume 21, Issue 2 - Apr 2011
Volume 21, Issue 1 - Feb 2011
Selecting the target year
Fifty Years of the ISRM and Associated Progress in Rock Mechanics
Park, Jung-Wook ; Park, Chul-Whan ; Han, Kong-Chang ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 407~426
This technical report is to introduce the paper which was presented in the 2011 ISRM Congress at Beijing by Prof. Edwin T. Brown. In commemoration of the fiftieth year of the life of ISRM, the emergence of rock mechanics as a distinctive engineering and scientific discipline is described. And the state and achievements of the discipline at the time the ISRM was founded in 1962, the events leading up to the formation of the Society, the development and achievements of the Society in the 50 years since 1962, and the progress made in the discipline of rock mechanics and rock engineering since that time are also discussed.
State of the Art of Segment Lining in Shield Tunnel and Statistical Analysis of Its Key Design Parameters
Chang, Soo-Ho ; Lee, Gyu-Phil ; Choi, Soon-Wook ; Bae, Gyu-Jin ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 427~438
Segment lining is a key permanent lining structure to maintain the shield tunnel stability in shield tunnel operation. Moreover, segment lining generally accounts for the largest proportion in the shield tunnel construction costs. As a result, technical improvements to increase its economic feasibility have been actively carried out. This study aims to propose the development directions of high-performance segments from their recent cutting technologies. In addition, based on over 2,100 world-widely collected segment design data, a series of statistical analyses of segment key design parameters such as thickness, width and the number of divisions as well as segment materials were carried out to approximately estimate them in a design stage.
Supporting The Tunnel Using Digital Photographic Mapping And Engineering Rock Classification
Kim, Chee-Hwan ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 439~449
The characteristics of rock fractures for engineering rock classification are investigated by analyzing three dimensional point cloud generated from adjusted digital images of a tunnel face during construction and the tunnel is reinforced based on the supporting pattern suggested by the RMR and the Q system using parameters extracted from those images. As results, it is possible saving time required from face mapping to tunnel reinforcing work, enhancing safety during face mapping work in tunnels and reliability of both the mapping information and selecting supporting pattern by storing the files of digital images and related information which can be checked again, if necessary sometime in the future.
Rock Displacement Measurement System by Precise Vision Metrology
Hwang, Jae-Yun ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 450~459
For the purpose of evaluating the safety of rock structures such as underground caverns, tunnels and slopes, rock displacement measurement is carried out to identify the behavior of rock masses. Tapes, levels, and total stations are usually applied to the displacement measurement. These tools, however, are weighed down by many disadvantages. In this study, a new displacement measurement system by precise vision metrology was proposed for the observational design and construction method of rock structures, and then applied to a tunnel under construction. Comparisons and investigations of the measurement of the tunnel have confirmed the effectiveness and applicability of the developed measurement system.
Weathering Characteristics of Rock under Natural Environment and Strength Evaluation of Weathered Rock
Kang, Dae-Wan ; Obara, Yuzo ; Hirata, Atsuo ; Kang, Seong-Seong ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 460~470
Wave velocity was measured to define the weathering characteristics of rock and the strength evaluation of weathered rock on a target of the Aso gravestones with various sizes under the natural environment. As a result, the size correction method which was changed sample of the different size to one of the same size for evaluating wave velocity was proposed, and also suggested the NET (Normalized Elapsed Time) as a new weathering index of rock. In addition, the strength of the weathered rock was estimated from the weathering classification of rock using the NET. Wave velocity of welded tuff was high and didn't show velocity degradation, on the other hand, one of andesite was low and showed velocity degradation. The degree of weathering between rocks of the different size is considered to be comparable, applying the NET based on the on the
-NET curve. Furthermore, the classification of rock weathering stages using the NET based on the
-NET curve was available, and the estimation of strength for the weathered rock was also possible.
Analysis of Characteristics of Horizontal Response Spectrum of Velocity Ground Motions from 5 Macro Earthquakes
Kim, Jun-Kyoung ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 471~479
The velocity horizontal response spectra using the observed ground motions from the recent 5 macro earthquakes, equal to or larger than 4.8 in magnitude, around Korean Peninsula were analysed and then were compared to the acceleration horizontal response spectra, seismic design response spectra (Reg Guide 1.60), applied to the domestic nuclear power plants, and finally the Korean Standard Design Response Spectrum for general structures and buildings. 102 velocity horizontal ground motions, including NS and EW components, were used for velocity horizontal response spectra and then normalized with respect to the peak velocity value of each ground motion. First, the results showed that velocity horizontal response spectra have larger values at the range of medium natural period, but acceleration horizontal response spectra have larger values at the range of short natural periods. Secondly, the results also showed that velocity horizontal response spectra exceed Reg. Guide 1.60 for longer natural periods bands less than 6-7 Hz. Finally, the results were also compared to the Korean Standard Response Spectrum for the 3 different soil types(SC, SD, and SE soil type) and showed that velocity horizontal response spectra revealed much higher values for the frequency bands below 1.5(SC), 2.0(SD), and 3.0(SE) seconds, respectively, than the Korean Standard Response Spectrum. The results suggest that the fact that acceleration, velocity, and displacement horizontal response spectra have larger values at the range of short, medium, and long natural periods, respectively, can be applied consistently to those form domestic ground motion, especially, the velocity ground motion. Information on response spectrum at such medium range periods can be very important since the domestic design of buildings and structures emphasizes recently medium and long natural periods than short one due to increased super high-rise buildings.
Characteristics of Dynamic Properties of Granite Specimen from Chungnam Yeongi Area
Min, June-Hyun ; Lee, Seung-Joong ; Choi, Sung-O. ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 480~493
Dynamic rock property is one of most important parameters in design of earthquake-resistant structures. In this study, free-free resonant column test has been conducted to obtain dynamic Young's modulus, dynamic shear modulus, and damping ratio among dynamic properties with granite specimen of Chungnam Yeongi area. The dynamic properties obtained from this test were compared with the physical properties from static rock tests, and their relationship has been analyzed. From our study, it has been concluded that the dynamic Young's modulus and the dynamic shear modulus are linearly proportional to the elastic wave velocity. And also the damping ratio has been identified to be in non-linear inverse proportion to the elastic wave velocity.
A Study on 3D Roughness Analysis of Rock Joints Based on Surface Angularity
Lee, Deok-Hwan ; Lee, Seung-Joong ; Choi, Sung-O. ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 494~507
Rock joint surface roughness is one of the most important parameters in shear behavior analysis of rock joint surface. Until now, estimation of joint surface roughness has been conducted by various statistical methods with two-dimensional analysis. In this study, standard roughness profile suggested by Barton and Choubey (1977) was expanded into a 3D surface and its surface roughness was analyzed by surface angularity parameter. And the validity of quantification based on surface angularity was secured through comparison with
and Ai parameter. Also the surface angularity parameter was compared with shear strength by joint shear test using the replicated specimen.
Assessment of Cutting Performance of a TBM Disc Cutter for Anisotropic Rock by Linear Cutting Test
Jeong, Ho-Young ; Jeon, Seok-Won ; Cho, Jung-Woo ; Chang, Soo-Ho ; Bae, Gyu-Jin ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 508~517
The linear cutting test is the most reliable and accurate approach to measuring cutting forces and cutting efficiency using full-size disc cutter in various rock types. The result of linear cutting tests can be used to obtain the key parameters of cutter-head design (i.e. optimum cutter spacing, cutter forces). In Korea, LCM (Linear Cutting Machine) tests have been performed for typical Korean rock types, but these studies focused on the isotropic rocktypes. For prediction of TBM (Tunnel Boring Machine) performances in complex geological conditions including a bedded and schistose rockmass, it is important to consider the effects of anisotropy of rockmass on cutting performances and cutting efficiency. This study discusses a series of LCM tests that were performed for Asan Gneiss having two types of anisotropy angles to assess the effect of the anisotropy angle on rock-cutting performances of TBM. The result shows that the rock-cutting performances and optimum cutting conditions are affected by anisotropy angle and the effect of anisotropy on rock strength should be considered in a prediction of the cutting performances and efficiency of TBM.
A Study on Natural Ventilation by the Caloric Values of HLW in the Deep Geological Repository
Roh, Jang-Hoon ; Choi, Heui-Joo ; Yu, Yeong-Seok ; Yoon, Chan-Hoon ; Kim, Jin ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 518~525
In this study, the natural ventilation pressure resulting from the large altitude difference which is a characteristic of high radioactive waste repository and the caloric value of the heat emitted by wastes was calculated and based on the results, natural ventilation quantities were calculated. A high radioactive waste repository can be considered as being operated through closed cycle thermodynamic processes similar to those of thermal engines. The heat produced by the heating of high radioactive wastes in the underground repository is added to the surrounding air, and the air goes up through the upcast vertical shaft due to the added heat while working on its surroundings. Part of the heat added by the work done by the air can be temporarily changed into mechanical energy to promote the air flow. Therefore, if a sustained and powerful heat source exists in the repository, the heat source will naturally enable continued cyclic flows of air. Based on this assumption, the quantity of natural ventilation made during the disposal of high radioactive wastes in a deep geological layer was mathematically calculated and based on the results, natural ventilation pressure of
Pa made by the stack effect was identified along with the resultant natural ventilation quantity of
. The result of an analysis by CFD was
which was very similar to the results obtained by the mathematical method.
Stability Analysis of Concrete Plugs Using a 3-D Failure Criterion
Lee, Youn-Kyou ; Song, Won-Kyoung ; Park, Chul-Whan ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 21, issue 6, 2011, Pages 526~535
A new failure criterion for concrete, which takes into account the effect of the intermediate principal stress, is proposed. The new criterion, which takes the advantages from both the Mohr-Coulomb and the Willam-Warnke criteria, is linear in the meridian section, while its octahedral section is always smooth and convex. Fitting the triaxial compression data with the proposed criterion shows the high performance of the new criterion. A new formula for the factor of safety of concrete is defined based on the new failure criterion and it is employed in the stability analysis of the concrete plugs installed in the pilot plant. The new formula for the factor of safety measures the degree of closeness of a stress state to the failure surface in the octahedral plane. Finally, 3-D finite element analyses of pilot plant were carried out to obtain the stress distributions in the plugs. Then, the stress distributions are converted to those of factor of safety by use of the proposed formula. Based on the distribution of factor of safety in the concrete plugs, the stability of the tapered and wedge-shaped plugs is evaluated.