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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 22, Issue 6 - Dec 2012
Volume 22, Issue 5 - Oct 2012
Volume 22, Issue 4 - Aug 2012
Volume 22, Issue 3 - Jun 2012
Volume 22, Issue 2 - Apr 2012
Volume 22, Issue 1 - Feb 2012
Selecting the target year
Technologies of Underground Thermal Energy Storage (UTES) and Swedish Case for Hot Water
Park, Doh-Yun ; Kim, Hyung-Mok ; Ryu, Dong-Woo ; Choi, Byung-Hee ; SunWoo, Choon ; Han, Kong-Chang ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 1~11
DOI : 10.7474/TUS.2012.22.1.001
Thermal energy storage is defined as the temporary storage of thermal energy at high or low temperatures for later use in need. The energy storage can reduce the time or rate mismatch between energy supply and demand, and thus it plays an important role in conserving energy and improving the efficiency of energy utilization, especially for renewable energy sources which provide energy intermittently. Underground thermal energy storage (UTES) can have additional advantages in energy efficiency thanks to low thermal conductivity and high heat capacity of surrounding rock mass. In this paper, we introduced the technologies of underground thermal energy storage and rock caverns for hot water storage in Sweden.
Comparative Study on the Rock Failure Criteria Taking Account of the Intermediate Principal Stress
Lee, Youn-Kyou ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 12~21
DOI : 10.7474/TUS.2012.22.1.012
Although the Mohr-Coulomb and Hoek-Brown failure criteria have been adopted widely in rock mechanics, they neglect the
effect. The result of true triaxial tests on rock samples, however, reveals that the
effect on strength of rocks is considerable, so that rock failure criteria taking into account the influence of
are necessary for the precise stability evaluation of rock structures. In this study, a new nonlinear 3-D failure criterion has been suggested by combining the Hoek-Brown criterion with the smooth octahedral shape function taken from Jiang & Pietruszczak (1988). The performance of the new criterion was assessed by comparing the strength predictions from both the suggested criterion and the corresponding linear 3-D criterion. The resulting fit of the new criterion to the true triaxial test data for six rock types taken from the literature shows that the criterion fits the experimental data very well. Furthermore, for the data sets having data taken in the low
range, the nonlinear failure criterion works better than the linear criterion.
A Study on the Stability of Asymmetrical Twin Tunnels in Alternating Rock Layers Using Scaled Model Tests
Kim, Jong-Woo ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 22~31
DOI : 10.7474/TUS.2012.22.1.022
In this study, scaled model tests were performed to investigate the stability of an asymmetrical twin tunnels constructed in rock mass comprising alternating layers of sandstone and shale. Each of tunnels had a differently shaped section, where the one was already constructed tunnel including lining structure but the other was planned to be under construction. Four types of test models which had respectively different pillar widths and loading conditions were experimented, where both crack initiating pressures and deformation behaviors around tunnels were investigated. The cracks of pillar mainly began to appear at the interfaces of alternating layers, following additional shear displacement between layers was confirmed as one of the most important factors of pillar failure in case of the model of pillar width 0.5D. The models with shallower pillar widths proved to be unstable because of lower crack initiating pressures and more tunnel convergences than the models with thicker pillar widths. The failure and deformation behaviors of tunnels were also dependent on the loading conditions, where the model of coefficient of lateral pressure 1.0 was more stable than the other model. Futhermore, the results of FLAC analysis were qualitatively coincident with the experimental results.
A Study of Weathering Characteristics of Cretaceous Granite in Kimhae Area due to Artificial Weathering Processes
Um, Jeong-Gi ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 32~42
DOI : 10.7474/TUS.2012.22.1.032
It is very difficult to capture the weathering characteristics of rock because of limitation caused by time and space. A new scheme of experiment that includes physical and chemical weathering processes was implemented on Cretaceous granitic rock samples from Kimhae area to investigate the variations of geomechanical properties of deteriorated rocks due to artificial weathering processes. The seismic velocity was found to decrease with increasing artificial weathering cycle. Effective porosity and absorption tend to increase with artificial weathering processes. The amount of deterioration of rock samples depend on pre-test degree of weathering. Effective porosity, absorption and seismic velocity can be used as the measure of weathering characteristics of granite in the study area. Weathering is accelerated by combined effect of physical and chemical weathering processes. The new experimental methodology conducted in this study has strong capability to analyze the weathering characteristics of rocks.
A Study of the Applicability of Cross-Section Method for Cut-Slope Stability Analysis
Cho, Tae-Chin ; Hwang, Taik-Jean ; Lee, Guen-Ho ; Cho, Kye-Seong ; Lee, Sang-Bae ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 43~53
DOI : 10.7474/TUS.2012.22.1.043
Stability of cut-slope, the orientation and dimension of which are gradually changed, has been analyzed by employing the cross-section method capable of comprehensibly considering the lithological, structural and mechanical characteristics of slope rock. Lithological fragility is investigated by inspecting the drilled core logs and BIPS image has been taken to delineate the rock structure. Engineering properties of drilled-core including the joint shear strength have been also measured. Potential failure modes of cut-slope and failure-induced joints are identified by performing the stereographic projection analysis. Traces of potential failure-induced joints are drawn on the cross-section which depicts the excavated geometry of cut-slope. Considering the distribution of potential plane failure-induced joint traces blocks of plane failure mode are hypothetically formed. The stabilities and required reinforcements of plane failure blocks located at the different excavation depth have been calculated to confirm the applicability of the cross-section method for the optimum cut-slope design.
Direct Measurement of Blast Pressure in Near Field with Lead Plate Blast Pressure Meter
Ko, Young-Hun ; Jang, Hyong-Doo ; Yang, Hyung-Sik ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 54~59
DOI : 10.7474/TUS.2012.22.1.054
Deformation of Lead plate blast pressure meter were measured after they were exposed to surface blasting. Blasting pressure was determined by comparing the data with calibration graph which was drawn from the laboratory experiments with gas gun of Hopkinson bar tester. The results were compared with calculated values from the equations of CONWEP (Conventional Weapons Effects Program) and DDESB (Department of Defence Explosives Safety Board). Measured values were lower than calculated values in near field. Gradual decaying tendency of the pressure was observed. It means that estimated blasting pressure of very near field with theoretical equations can be uncertain.
An Assessment of Rock Pillar Behavior in Very Near Parallel Tunnel
Kim, Won-Beom ; Yang, Hyung-Sik ; Ha, Tae-Wook ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 60~68
DOI : 10.7474/TUS.2012.22.1.060
Focusing on the load tunnel, this study assessed the behavior of rock pillars with less than 0.5D of the minimized distance between the two horizontal tunnels by using a three dimensional numerical analysis. Based on a parameter affecting the behavior of rock pillars, this study evaluated different safety factors according to pillar width, depth and rock conditions. It turned out that as the pillar width increases, the current curve of safety factors in accordance with depth and rock conditions shows more of the nonlinear behavior. Judging from the minimum safety factor, the study suggested a design chart, working on the minimized distance between the two horizontal tunnels.
Experimental and Numerical Studies on Application of Industrial Explosives to Explosive Welding, Explosive Forming, Shock Powder Consolidation
Kim, Young-Kook ; Kang, Seong-Seung ; Cho, Sang-Ho ;
Tunnel and Underground Space, volume 22, issue 1, 2012, Pages 69~76
DOI : 10.7474/TUS.2012.22.1.069
Theoretical backgrounds on the experimental methods of explosive welding, explosive forming and shock consolidation of powders are introduced. Explosive welding experiments of titanium (Ti) and stainless steel (SUS 304) plate were carried out. It was revealed that a series of waves of metal jet are generated in the contact surface between both materials; and that the optimal collision velocity and collision angle is about 2,100~2,800 m/s and
, respectively. Also, explosive forming experiments of Al plate were performed and compared to a conventional press forming method. The results confirmed that the shock-loaded Al plate has a larger curvature deformation than those made using conventional press forming. For shock consolidation of powders, the propagation behaviors of a detonation wave and underwater shock wave generated by explosion of an explosive are investigated by means of numerical calculation. The results revealed that the generation and convergence of reflected waves occur at the wall and center position of water column, and also the peak pressure of the converged reflected waves was 20 GPa which exceeds the detonation pressure. As results from the consolidation experiments of metal/ceramic powders (
bulk without cracks was successfully obtained by adapting the suggested water container and strong bonding between powder particles was confirmed through microscopic observations.