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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 20, Issue 6 - Dec 2010
Volume 20, Issue 5 - Oct 2010
Volume 20, Issue 4 - Aug 2010
Volume 20, Issue 3 - Jun 2010
Volume 20, Issue 2 - Apr 2010
Volume 20, Issue 1 - Feb 2010
Selecting the target year
Estimation of Water Leak Rate in the Underground Oil Storage Cavern
Shim, Hyun-Jin ; Park, Tae-Jun ; Jeong, Woo-Cheol ; Kim, Ho-Yeong ; Choi, Young-Tae ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 233~240
Double Plug is constructed for preventing mixing of two different oils between two compartments in the underground oil storage cavern. And the gas and oil tightness of double plug is tested from the measurement of water leakage from double plug after the completion of double plug water filling. If water leakage is underestimated, it can increase construction cost and if water leakage is overestimated, it can increase operating cost. Therefore, optimum water leakage should be estimated to cut down the cost. In this study, hydraulic stability analysis was conducted to consider permeable properties of rock mass around double plugs and a water leak rate from double plug was estimated from the hydraulic stability analysis and case study. Finally, the reliability of estimation of water leak rate was proven by comparing estimated water leak rate with measured data.
Review of the Study on Mechanical Properties of Rock Under the Polar Climate Condition
Ryu, Sung-Hoon ; Song, Jae-Joon ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 241~251
The polar region is in the limelight for an academic worth as well as plenty of natural resources. The study on the polar region was reviewed for better understanding of the polar region and its rock properties. The antarctica has a windy and dry climate along with the lowest temperature on the earth. The thermal distribution according to depth in the area was reported: The freezing-thawing process was repeated in shallow depth, and the temperature falls down below zero under the specific depth. There is a great temperature difference between the atmosphere and rock. A research reported for the degree of weathering of the antarctic slope by using Schmidt hammer and Taffoni test. The rock specimens weathered by repeated freezing-thawing process were tested of the shore hardness and uniaxial compressive strength: The rock strength gradually decreased as the freezing-thawing process was repeated. The comprehensive mechanical properties of the polar region rocks and the relationship between the laboratory weathering test result and the real rock property change in the site remain as future research topics.
The Mixed Charging Method with Low-velocity Explosives and Normal Explosives in Tunnel Blasting
Kang, Dae-Woo ; Ahn, Bong-Do ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 252~259
In urban tunnels, namely, in case there are residents in the near distance, we normally use non-vibration and ambient vibration which are not blasting methods because it’ impossible to meet the blasting vibration regulation with only normal explosives. However, non-vibration methods not only cause increase of excavating cost, but need much time than explosives. Generally, the lower velocity explosives with 2,000 m/s VOD have been applied to ambient vibration blasting in open cut area, but difficult in tunneling in its use. However, by charging the hole together with lower velocity explosives and normal explosives, we have got the result which shows 20~30% vibration decrease compared with using only normal explosives. Therefore, I’ like to suggest the blasting method which is able to do as ambient vibration using lower velocity explosives mixed with normal explosives in urban tunnel and the area which is adjacent to security facilities within the vibration regulation.
Behavior of 2-Arch Tunnel with Stiffness of Grouting
Lee, Jong-Min ; Lee, Sang-Duk ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 260~266
In this study, wish to analyze effect that affect on each tunnel (right and left tunnel) according as proceeding of leading tunnel (right tunnel), following tunnel (left tunnel) and pilot tunnel excavation through behavior of tunnel and surrounding base by model tests. And stress-transfer mechanism that occurs from in-situ loosing area and arching effect by difference of stiffness ratio and overburden heights were verified experimentally. The model tests were carried out by varying the stiffness of reinforced area and overburden height, measured deformation of tunnel and displacement of surrounding base. The model tests followed exactly the real 2-Arch tunnel construction stages.
Numerical Study on the Behavior of Fully Grouted Rock Bolts with Different Boundary Conditions
Lee, Youn-Kyou ; Song, Won-Kyong ; Park, Chul-Whan ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 267~276
In modern rock engineering practice, fully grouted rock bolting is actively employed as a major supporting system, so that understanding the behavior of fully grouted rock bolts is essential for the precise design of rock bolting. Despite its importance, the supporting mechanism of rock bolts has not been fully understood yet. Since most of existing analytical models for rock bolts were developed by drastically simplifying their boundary conditions, they are not suitable for the bolts of in-situ condition. In this study, 3-D elastic FE analysis of fully grouted rock bolts has been conducted to provide insight into the supporting mechanism of the bolt. The distribution of shear and axial stresses along the bolt are investigated with the consideration of different boundary conditions including three different displacement boundary conditions at the bolt head, the presence of intersecting rock joints, and the variation of elastic modulus of adjacent rock. The numerical result reveals that installation of the faceplate at the bolt head plays an important role in mobilizing the supporting action and enhancing the supporting capabilities of the fully grouted rock bolts.
A Study on the Application of a Exhaust Engine in Basement Karaoke Fires
Lee, Sung-Ryong ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 277~283
In this study, an experiment was conducted to evaluate the effectiveness of a exhaust engine in a basement karaoke fire. Exhaust engine was used as ventilation equipment in the experiment. Experiment was carried out in a basement karaoke for redevelopment. Temperature distribution and smoke concentration were evaluated according to the operation of an exhaust engine. Temperatures were decreased below
at the corridor due to the operation of the exhaust engine. Visibility was also improved.
A Correlation to Predict the Thermal Conductivity of Buffer and Backfill Material for a High-Level Waste Repository
Cho, Won-Jin ; Lee, Jae-Owan ; Kwon, Sang-Ki ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 284~291
In the present design concept of a high-level waste repository, the bentonite and bentonite-sand mixture are considered as the buffer and backfill material. For the Kyungju bentonite which is a candidate material, the thermal conductivities of compacted bentonite and bentonite-sand mixture were measured. A correlation has been proposed to predict the thermal conductivity of the Kyungju bentonite and the bentonite-sand mixture as a function of the dry density, the water content and the sand fraction. The proposed correlation can predict the thermal conductivity with a difference less than 10% under the experimental conditions.
Time-History Analysis on Structure Dynamic Response for the SDOF System of Ground Vibration by the Newmark
Kim, Jong-In ; Kang, Seong-Seung ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 292~298
The purpose of this study is to evaluate an effect of ground vibration caused by blasting on the concrete brick structure. For the purpose, dynamic response time-history of the structure assumed single degree of freedom (SDOF) system and vibration time-history directly measured from the structure were examined, using Newmark
method based on data measured at ground. The time-history was interpreted from the measured data of ground and structure in single hole blasting. Vibration magnitude between ground vibration and structure in single hole blasting and 20 ms interval blasting was about three times and was shown larger vibration on the structure. By time-history analysis of structure dynamic response, the value was almost the same one with the data measured from the structure. It indicates that the vibration characteristics of structures may be predicted on the basis of the ground vibration data measured from the sub-ground of structure.
A Numerical Study on the Effect of a Guide Hole on Crack Propagation Control in Blasting
Lee, Hee-Gwang ; Kim, Hak-Man ; Kim, Seung-Kon ; Cho, Sang-Ho ;
Tunnel and Underground Space, volume 20, issue 4, 2010, Pages 299~307
The model experiments, which employ a charge hole and guide hole, are simulated to examine the effect of the guide hole on the crack propagation control in blasting. Crack patterns resulted from the analysis models, which consider the distance between the charge hole and guide hole, were compared. From the simulation analysis for the model experiments, it was revealed that all the guide holes used in this study were effective for controlling the crack propagation in blasting.