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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 23, Issue 6 - Dec 2013
Volume 23, Issue 5 - Oct 2013
Volume 23, Issue 4 - Aug 2013
Volume 23, Issue 3 - Jun 2013
Volume 23, Issue 2 - Apr 2013
Volume 23, Issue 1 - Feb 2013
Selecting the target year
Underground Space Development and Strategy in Korea
Shin, Hee-Soon ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 327~336
DOI : 10.7474/TUS.2013.23.5.327
Approximately 70% of the Korean peninsula is composed of mountains, around 99,274
. Even worse, population rate of Korea is the No.3 in the world now. Accordingly, it is necessary to develop the potential underground space actively with the concept of another territory to be utilized. The development of underground space should be considered not a choice but an indispensable issue. Since 1970s, many large-scale underground structures have been constructed like as crude-oil storage bins, liquefied petroleum gas storage caverns, and underground pumped storage powerplants. Also, In urban area, the underground facilities such as subway networks, underground shopping mall, underground pedestrian network, electric power tunnels, and car parking lots have been used extensively. The scale of Yeosu oil and gas underground storage facility and Seoul subway systems are one of the massive scale in the world. Recently, the trend of the development of underground space becomes more diverse and larger scale. The current status of Korean underground space developments and strategy are described in this paper.
Characteristics of Subsidence above a Shallow Tunnel Excavated in Weathered Rock Mass
Kim, Chee-Hwan ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 337~346
DOI : 10.7474/TUS.2013.23.5.337
The characteristics of subsidence above a shallow tunnel excavated in weathered rock mass is analyzed. The tunnel is excavated minimum about 11m beneath some buildings and the width of the tunnel is 11m, too. Subsidence pins are installed at 23 locations on surface along the tunnel, 180m long, adjacent to the buildings. Subsidences are measured for about 2 years and they are optimized to analyze three dimensional deformed ground surface, trough width parameter K and sectional volume loss of unit tunnel length Vs of the surface deformation profile.
Effective Development Direction of the Underground Space in Busan
Hwang, Jae-Yun ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 347~352
DOI : 10.7474/TUS.2013.23.5.347
Recently, due to the gravitation of the population and traffic congestion, the land supply tends to be short. Underground space development is considered positively as a countermeasure. This study was to review the basic principles of underground space, to find out problems, and to propose the direction for the effective development of underground space.
Creation of Vector Network Data with Considering Terrain Gradient for Analyzing Optimal Haulage Routes of Dump Trucks in Open Pit Mines
Park, Boyoung ; Choi, Yosoon ; Park, Han-Su ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 353~361
DOI : 10.7474/TUS.2013.23.5.353
Previous studies for analyzing optimal haulage routes of dump trucks in open pit mines mostly used raster data. However, the raster data has several problems in performing optimal route analyses: (1) the jagged appearance of haulage roads according the cell resolution often causes overestimation of the travel cost; (2) it difficult to trace the topological relationships among haulage roads. These problems can be eliminated by using vector network data, however a new method is required to reflect the performance characteristics of a dump truck according to terrain gradient changes. This study presents a new method to create vector network data with the consideration of terrain gradient for analyzing optimal haulage routes of dump trucks in open pit mines. It consists of four procedures: (a) creating digital elevation models, (b) digitizing haulage road networks, (c) calculating the terrain gradient of haulage roads, and (d) calculating the average speed and travel time of a dump truck along haulage roads. A simple case study at the Roto South pit in the Pasir open pit coal mine, Indonesia is also presented to provide proof that the proposed method is easily compatible to ArcGIS Network Analyst software and is effective in finding optimal haulage routes of dump trucks with considering terrain gradient in open pit mines.
Comparison of Tensile Strengths in Granite Using Brazilian Tests and Hollow Cylinder Tests for Hydraulic Fracturing Test Interpretation
Jo, Yeonguk ; Chang, Chandong ; Lee, Tae Jong ; Kim, Kwang-Yeom ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 362~371
DOI : 10.7474/TUS.2013.23.5.362
We conducted hollow cylinder tensile strength tests and Brazilian tests in Seokmo granite to measure tensile strength necessary for estimating the magnitude of the maximum horizontal principal stress in hydraulic fracturing stress measurements. Two different pressurization rates were used in hollow cylinder tests. Tensile strengths were determined to be higher at higher pressurization rate, which suggests that tensile strength should be measurement at the same rate used in actual in situ hydraulic fracturing tests. Considering the effect of pressurization rate and specimen size on tensile strength, the hollow cylinder tests and Brazilian tests yield similar results each other. This demonstrates that Brazilian tests can be utilized to produce representative tensile strengths for interpretation of hydraulic fracturing test results.
Thermal-hydro-mechanical Modelling for an Äspö prototype repository: analysis of thermal behavior
Lee, Jae Owan ; Birch, Kenneth ; Choi, Heui-Joo ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 372~382
DOI : 10.7474/TUS.2013.23.5.372
Thermal-hydro-mechanical (THM) modeling is a critical R&D issue in the performance and safety assessment of a high-level waste repository. With an
prototype repository, its thermal behavior was analyzed and then compared with in-situ experimental data for its validation. A model simulation was used to calculate the temperature distributions in the deposition holes, deposition tunnel, and surrounding host rock. A comparison of the simulation results with the experimental data was made for deposition hole DH-6, which showed that there was a temperature difference of
depending on the location of the measuring points, but there was a similar trend in the evolution curves of temperature as a function of time. It was expected that the coupled modeling of the thermal behavior with the hydro-mechanical behavior in the buffer and backfill of the
prototype repository would give a better agreement between the experimental and model calculation results.
Intermediate Principal Stress Dependency in Strength of Transversely Isotropic Mohr-Coulomb Rock
Lee, Youn-Kyou ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 383~391
DOI : 10.7474/TUS.2013.23.5.383
A number of true triaxial tests on rock samples have been conducted since the late 1960 and their results strongly suggest that the intermediate principal stress has a considerable effect on rock strength. Based on these experimental evidence, various 3-D rock failure criteria accounting for the effect of the intermediate principal stress have been proposed. Most of the 3-D failure criteria, however, are focused on the phenomenological description of the rock strength from the true triaxial tests, so that the associated strength parameters have little physical meaning. In order to confirm the likelihood that the intermediate principal stress dependency of rock strength is related to the presence of weak planes and their distribution to the preferred orientation, true triaxial tests are simulated with the transversely isotropic rock model. The conventional Mohr-Coulomb criterion is extended to its anisotropic version by incorporating the concept of microstructure tensor. With the anisotropic Mohr-Coulomb criterion, the critical plane approach is applied to calculate the strength of the transversely isotropic rock model and the orientation of the fracture plane. This investigation hints that the spatial distribution of microstructural planes with respect to the principal stress triad is closely related to the intermediate principal stress dependency of rock strength.
A study on the Correlation Between Orientation of Joint Sets and Location of Subsidence Zone in Subsidence Area
Kim, Byung-Ryeol ; Lee, Seung-Joong ; Choi, Sung-Oong ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 392~400
DOI : 10.7474/TUS.2013.23.5.392
Joint sets should be considered as an influence factor, when location of subsidence zone by stopes is predicted. And the mechanical properties and distribution patterns of joint set above stopes may be affecting subsidence occurrence. In this study, therefore, the orientation of joint sets is reanalyzed with the data from the previous research on prediction of defining the subsidence zone. From a correlated analysis, the influence of major joint set(
) on subsidence location was analyzed by comparing the angle of assumption with the angle of major joint set(
A Study of the Effect of Asperity Change on the Shear Strength of Joint Plane
Cho, Taechin ; Suk, Jaewook ; Lee, Jonggun ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 401~412
DOI : 10.7474/TUS.2013.23.5.401
Multi-stage shear test has been performed using joint specimens of gneiss, granite and shale to investigate the influence of micro-scale asperity change on the shear strength of joint plane. For each shear test asperity degradation characteristics of joint specimens of different joint surface strength have been analyzed by utilizing the optimum asperity parameter which can reflect the sequential asperity degradation. Elevation of joint surface profile has been measured and both the changes of asperity parameters and micro-scale asperity distribution have been investigated. Two distinctive variation modes of cohesion and friction angle have been delineated and major cause of shear strength parameter change has been analyzed by considering the micro-scale asperity angle change resulting from the abrasion, fracturing and regeneration of micro-scale asperities. Effects of micro-scale asperity variation on the joint shear strength have been also investigated.
An Experimental Study on the Evaluation of Early-Age Mechanical Properties of Polymer-Based Thin Spray-on Liners
Chang, Soo-Ho ; Lee, Gyu-Phil ; Han, Jin-Tae ; Park, Young-Taek ; Choi, Soon-Wook ; Hwang, Gwi-Sung ; Choi, Myung-Sik ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 413~427
DOI : 10.7474/TUS.2013.23.5.413
Thin Spray-on Liners(TSLs) based on polymer materials have been considered as an alternative to shotcrete and wire mesh in relatively fair rock conditions, and used in mines since 1990s. Nevertheless, Few experimental studies on their mechanical properties necessary for the evaluation of their bearing capacities as a support member have been carried out. In this study, tensile and bond strengths of two kinds of TSLs with different material compositions were measured at the age of 7 days. In addition, two kinds of bending tests proposed by EFNARC (2008) to simulate representative failure mechanisms of TSLs were carried out on the same materials and curing age as in tension and pull-out tests. From the tests, tensile strength of a TSL is shown to increase as its content of polymer is higher. In contrast, its bond strength seems to be in inverse proportion to its polymer content. Especially, the TSL material in which a cementitious component is included with relatively smaller polymer content shows a faster hardening characteristic which results in higher resistance to de-bonding between a TSL and a substrate. As a result, it is shown that the performance of TSLs might be dependent upon its corresponding polymer content.
Excavation Mechanism of Roadheader and Statistical Analysis of its Key Design Parameters Based on Database
Park, Young-Taek ; Choi, Soon-Wook ; Park, Jae-Hyun ; Lee, Chul-Ho ; Chang, Soo-Ho ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 428~441
DOI : 10.7474/TUS.2013.23.5.428
Nowadays, a roadheader as a mechanical excavator is in high demand, especially for mines under various conditions and tunnels where TBMs are inapplicable. However, the records of roadheaders in Korea are seldom reported. Moreover, the number of countries with their intrinsic design and manufacturing technologies of roadheaders is very limited. Therefore, this study aimed to analyse the excavation principles of roadheader as well as its key design parameters for its optimized selection and design. In addition, the database with 143 world-widely collected roadheader design data was built, and a few statistical correlations were derived from it. A schematic procedure for roadheader design based on the database was also proposed.
A Comparative Study on Heat Loss in Rock Cavern Type and Above-Ground Type Thermal Energy Storages
Park, Jung-Wook ; Ryu, Dongwoo ; Park, Dohyun ; Choi, Byung-Hee ; Synn, Joong-Ho ; Sunwoo, Choon ;
Tunnel and Underground Space, volume 23, issue 5, 2013, Pages 442~453
DOI : 10.7474/TUS.2013.23.5.442
A large-scale high-temperature thermal energy storage(TES) was numerically modeled and the heat loss through storage tank walls was analyzed using a commercial code, FLAC3D. The operations of rock cavern type and above-ground type thermal energy storages with identical operating condition were simulated for a period of five consecutive years, in which it was assumed that the dominant heat transfer mechanism would be conduction in massive rock for the former and convection in the atmosphere for the latter. The variation of storage temperature resulting from periodic charging and discharging of thermal energy was considered in each simulation, and the effect of insulation thickness on the characteristics of heat loss was also examined. A comparison of the simulation results of different storage models presented that the heat loss rate of above-ground type TES was maintained constant over the operation period, while that of rock cavern type TES decreased rapidly in the early operation stage and tended to converge towards a certain value. The decrease in heat loss rate of rock cavern type TES can be attributed to the reduction in heat flux through storage tank walls followed by increase in surrounding rock mass temperature. The amount of cumulative heat loss from rock cavern type TES over a period of five-year operation was 72.7% of that from above-ground type TES. The heat loss rate of rock cavern type obtained in long-period operation showed less sensitive variations to insulation thickness than that of above-ground type TES.