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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
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Volume & Issues
Volume 24, Issue 6 - Dec 2014
Volume 24, Issue 5 - Oct 2014
Volume 24, Issue 4 - Aug 2014
Volume 24, Issue 3 - Jun 2014
Volume 24, Issue 2 - Apr 2014
Volume 24, Issue 1 - Feb 2014
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Assessment of Rock Slope Stability and Factor Analysis with a Consideration of a Damaged Zone
Kim, Jin-Soo ; Kwon, Sangki ; Cheon, Dae-Sung ; Park, Eui-Seob ;
Tunnel and Underground Space, volume 24, issue 3, 2014, Pages 187~200
DOI : 10.7474/TUS.2014.24.3.187
After excavation or blasting, rock properties within an excavation damaged zone can be perpetually weakened on account of stress redistribution or blasting impact. In the present study, the excavation damaged zone is applied to a rock slope. The objective of this research is to compare the mechanical stability of the rock slope depending on the presence of the damaged zone using 2-dimensional modeling and analyze factors affecting factor-of-safety. From the modeling, it was founded that the mechanical stability of the rock slope is significantly dependent on the presence of the damaged zone. In particular, factor-of-safety with a consideration of the damaged zone decreased by approximately 49.4% in comparison with no damaged zone. Factor analysis by fractional factorial design was carried out on factor-of-safety. It showed that the key parameters affecting factor-of-safety are angle of the slope, cohesion, internal friction angle and height.
Thermal Performance Analysis of Multiple Thermal Energy Storage (TES) Caverns with Different Separation Distances Using Computational Fluid Dynamics
Park, Dohyun ; Park, Eui-Seob ; Sunwoo, Choon ;
Tunnel and Underground Space, volume 24, issue 3, 2014, Pages 201~211
DOI : 10.7474/TUS.2014.24.3.201
In the present study, the thermal performance of multiple rock caverns for large-scale thermal energy storage (TES) was numerically investigated for different separation distances between the caverns through heat transfer analysis using a computational fluid dynamics code, FLUENT. The thermal performance of multiple caverns was assessed in terms of the thermal stratification within the caverns and the heat loss to the surroundings, and the heating characteristics of the rock around the caverns were investigated. The results of numerical simulation showed that there was little difference in thermal performance between multiple TES caverns with different separation distances when the surrounding rock was less heated and it reached thermal steady-state, which represent the thermal states of the surrounding rock at the early and long-term operational stages of the TES caverns, respectively. However, as the separation distance decreased, the rock between the caverns reached thermal steady-state more quickly, and thus the heat loss from the caverns tended to converge rapidly to the value of heat loss occurred under thermal steady-state conditions in the surrounding rock. This result implies that the operating cost of heating the surrounding rock (i.e., rock heating) can be reduced with a reduction in the separation distance between multiple caverns, and suggests that the separation distance should be determined by considering the operating cost of rock heating as well as the construction cost of the caverns.
Stability Analysis of Mine Roadway Using Laboratory Tests and In-situ Rock Mass Classification
Kim, Jong Woo ; Kim, Min Sik ; Lee, Dong Kil ; Park, Chan ; Jo, Young Do ; Park, Sam Gyu ;
Tunnel and Underground Space, volume 24, issue 3, 2014, Pages 212~223
DOI : 10.7474/TUS.2014.24.3.212
In this study, the stability analyses for metal mine roadways at a great depth were performed. In-situ stress measurements using hydrofracturing, numerous laboratory tests for rock cores and GSI & RMR classifications were conducted in order to find the physical properties of both intact rock and in-situ rock mass distributed in the studied metal mine. Through the scenario analysis and probabilistic assessment on the results of rock mass classification, the in-situ ground conditions of mine roadways were divided into the best, the average and the worst cases, respectively. The roadway stabilities corresponding to the respective conditions were assessed by way of the elasto-plastic analysis. In addition, the appropriate roadway shapes and the support patterns were examined through the numerical analyses considering the blast damaged zone around roadway. It was finally shown to be necessary to reduce the radius of roadway roof curvature and/or to install the crown reinforcement in order to enhance the stability of studied mine roadways.
Variation of Thermal and Mechanical Properties of Crystalline Granite under Saturated-Loading Condition
Heo, Jin ; Lee, Jae Chul ; Seo, Jung Bum ; Park, Seung Hun ; Park, Jung Chan ; Kwon, Sangki ;
Tunnel and Underground Space, volume 24, issue 3, 2014, Pages 224~233
DOI : 10.7474/TUS.2014.24.3.224
It is well known that rock properties can be affected by loading in underground condition. In the case of flooded underground mine or tunnels, rock properties variation due to loading might be different from the loading in dry condition. In order to verify the influence of saturated loading condition on rock properties, various laboratory tests had been carried out. Loading on the rock specimen was controlled to be ranged in between 20 ~ 80% of UCS. By comparing the variation of thermal, mechanical, and physical properties of rock specimens under the same load in saturated and dry condition, it was possible to find that the rock properties can be more significantly disturbed in the saturated loading condition than in dry loading condition.
Development of a 4D Information based Integrated Management System for Geothermal Power Plant Drilling Project
Lee, Seung Soo ; Kim, Kwang Yeom ; Shin, Hyu-Soung ;
Tunnel and Underground Space, volume 24, issue 3, 2014, Pages 234~242
DOI : 10.7474/TUS.2014.24.3.234
Deep drilling project should be managed systematically and efficiently because it is significantly influenced by various related factors having uncertainty and high risk in terms of economy and effective management. In particular, drilling project involves participants from various sectors including necessary service company and it also needs their collaboration by sharing related information occurring at drilling process in order to secure efficient performance management. We developed 4D (3D + time) information based visualization system for progress management by combining 3D design model and predicted optimized control parameters for each section in geothermal well design. We also applied PDM (precedence diagramming method) to the system in order to setup the effective process model and hooked it up to 3D information based on precedence relation and required time for informatized process network.
Numerical Simulation for Characteristics of Rock Strength and Deformation Using Grain-Based Distinct Element Model
Park, Jung-Wook ; Lee, Yun-Su ; Park, Chan ; Park, Eui-Seob ;
Tunnel and Underground Space, volume 24, issue 3, 2014, Pages 243~254
DOI : 10.7474/TUS.2014.24.3.243
The present study introduces a numerical technique to simulate the mechanical behavior of brittle rock, based on a grain-based model combined with Universal Distinct Element Code (GBM-UDEC). Using the technique, the microstructure of rock sample was represented as an assembly of deformable polygonal grains, and the failure process with the evolution of micro tensile cracks under compression was examined. In terms of the characteristics of strength and deformation, the behaviors of the simulated model showed good agreement with the observations in the laboratory-scale experiments of rock.