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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
GRAM Model Analysis of Groundwater Rebound in Abandoned Coal Mines
Choi, Yosoon ; Baek, Hwanjo ; Cheong, Young-Wook ; Shin, Seung-Han ; Kim, Gyoung-Man ; Kim, Dae-Hoon ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 373~382
DOI : 10.7474/TUS.2012.22.6.373
Cessation of dewatering usually results in groundwater rebound after closing an underground coal mine because the mine voids and surrounding strata flood up to the levels of decant points such as shafts and drifts. Several numerical models have been developed to predict the timing, magnitude and location of discharges resulting from groundwater rebound. This study reviews the numerical models such as VSS-NET, GRAM and MODFLOW, and compares their scopes of assessment at different spatial and time scales. In particular, the GRAM model was reviewed in details to implement it. This paper describes the implementation of GRAM model and its application to the Dongwon coal mine in Korea. The application showed that the groundwater level modeled at the shaft of Dongwon coal mine using the GRAM model is similar to the observed one in the field.
Introduction of the M
BCP and Risk Assessment of Underground Limestone Mine
Lee, Seong Min ; Kim, Sun-Myung ; Lee, Yeon Hee ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 383~392
DOI : 10.7474/TUS.2012.22.6.383
This study introduces
(Mining Business Continuity Planning) which is the smart management system of mine disasters to achieve the safe and eco-friendly mining. Where, 'i' is mine kinds, 'j' is mining processes, and 'k' is risks at process respectively. By specifically setting 'i=1=limestone mine', this study also suggests that
is the smart management system of limestone mine. Mining risks used in this study were obtained from professional survey and literature review. This study classified these risks by five different mining processes and reduced risk numbers approximately 60 to 26. And they were all allocated into
and assessed. To do assess risks, this study used four risk indexes which are probability, casualty, facility loss, and discontinuity respectively. By the results of the assessment of risks, results could be four specific groups based on their causes and impacts. In addition, one of the results showed that the most possible risks at limestone mine was the roof-fall and rock-fall in digging process. This result means that
should be established as a first priority at limestone mine.
Analysis for the Behavior of Ridge-Cut Rock Slope
Cho, Tae-Chin ; Hwang, Taik-Jean ; Shin, Sun-Mi ; Lee, Guen-Ho ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 393~402
DOI : 10.7474/TUS.2012.22.6.393
A behavior of ridge-cut rock slope had been monitored by installing inclinometers and regional slope movement toward rear side of cut face was detected. To delineate the governing factors of slope behavior, especially backward slip of ridge-cut slope, petrographic characteristics of rock cores obtained from four drilled boreholes had been examined. BIPS images inside boreholes had been acquired and structural characteristics of slope rock had been studied. Mechanical properties of discontinuity planes distributed in the drilled core had been measured and the shear strength of coal seam imbedded-discontinuity planes also had been obtained by performing the direct shear test. Monitoring results of slope behavior had been analyzed by comprehensibly considering both the mechanical and structural characteristics of slope rock and coal seam-imbedded discontinuity planes, and the potential governance of coal seam and clay minerals embedded in the joint plane on the regional slope behavior has been also identified.
Development of Tip Device for Hydraulic Filling Efficiency Improvements
Yu, Sung-Kon ; Kim, Tae-Heok ; Shin, Dong-Chun ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 403~411
DOI : 10.7474/TUS.2012.22.6.403
In recent, the using of the hydraulic filling method has increased on the underground reinforcement of the abandoned mine in Korea, however it is the lack of research on the efficient filling method. In this study, tank model tests and field tests were conducted for development of tip device for filling efficiency improvements on the hydraulic filling method. In tank model experiments, the filling efficiency was evaluated according to the form and angle of the nozzle on tip device in the same condition. Then tip device model designed by tank model tests was applied to the field experiment. As a result, the amount of filling of nozzle
tube is increased by approximately 18% compared to the common vertical injection pipe. The angle of repose was
. Filling hole spacing in the field is usually designed from 5m up to 10m assumed to be
of the angle of repose. According to the results of this study, it is possible that the filling hole spacing expands at least 10m up to 15m applied to be
of the angle of repose. Therefore, it is expected to be economical and efficient mine filling.
Mine Haulage System Design for Reopening of Yangyang Iron Mine using 3D Modelling
Son, Youngjin ; Kim, Jaedong ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 412~428
DOI : 10.7474/TUS.2012.22.6.412
To achieve mine development, a large amount of data concerned with the geological structure and the ore body had to be investigated and collected through geological survey, drilling and geophysical explorations. In most previous cases, however, the data were usually analyzed two dimensionally and those results showed some limits because of their 2D presentation. Those 2D maps such as geological plane sections or longitudinal sections cause lots of difficulties in understanding the complex geological structure or the feature of ore body in a spatial way. In this study, research area was set on the abandoned Yangyang iron mine in Korea and the Sugaeng ore body within the mine was selected as the research target to design a mine haulage system for reopening. A 3D mine model of this area was tried to be constructed using a 3D modelling software, GEMS. An accurate 3D model including the ore body, the geological structure, the old underground mine drifts and the new mine drifts was constructed under the purpose of reopening of the abandoned iron mine. Especially, mine design for trackless haulage system was conducted. New inclines and drifts were planned and modelled 3 dimensionally considering the utilization of old drifts and shaft. In addition to the 3D modelling, geostatistical technique was adopted to generate a spatial distribution of the ore grade and the rock physical properties. 3D model would be able to contribute in solving problems such as evaluating ore reserves, planning the mine development and additional explorations and changing the development plans, etc.
A Study on the Prediction of HLW Temperature from Natural Ventilation Quantity using CFD
Roh, Jang-Hoon ; Yu, Yeong-Seok ; Jang, Seung-Hyun ; Park, Seon-Oh ; Kim, Jin ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 429~437
DOI : 10.7474/TUS.2012.22.6.429
This study predicted temperature in the disposal tunnels using computational fluid dynamics based on natural ventilation quantity that comes from high altitude and temperature differences that are the characteristics of high level waste repository. The result of the previous study that evaluated quantitatively natural ventilation quantity using a hydrostatic method and CFD shows that significant natural ventilation quantity is generated. From the result, this study performed the prediction of temperature in disposal tunnels by natural ventilation quantity by the caloric values of the wastes, at both deep geological repository and surface repository. The result of analysis shows that deep geological repository is effective for thermal control in the disposal tunnels due to heat transfer to rock and the generation of sufficient natural ventilation quantity, while surface repository was detrimental to thermal control, because surface repository was strongly affected by external temperature, and could not generate sufficient natural ventilation quantity. Moreover, this study found that in the case of deep geological repository with a depth of 200 m, the heatof about
was transferred to the depth of 500 m. Thus, it is considered that if the high level waste repository scheduled to be built in the country is designed placing an emphasis on thermal control, deep geological repository rather than surface repository is more appropriate.
A Study on Measurement of Rock Joint Roughness Using the Digital Photogrammetry
Seo, Hyeonkyo ; Um, Jeong-Gi ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 438~448
DOI : 10.7474/TUS.2012.22.6.438
Applicability of the digital photogrammetry technique for measurement of rock joint roughness is addressed in this study using the DSLR camera. Measurements of roughness were performed for two rock joint specimens using the laser profiler and the digital photogrammetry technique. The statistical roughness parameters were estimated for two dimensional roughness profiles constructed from each method. Obtained results showed that the statistical roughness parameters estimated from the digital photogrammetry technique were lower than that based on the laser profilometer, even though a high degree of correlation might exist between them. The effects of camera direction on roughness measurements were found to negligible in practice. The digital photogrammetry could be a cost effective method to measure the roughness of rock joints with various scale at the fields.
A Study on the Model Test for Mine Filling Using Coal Ash
Lee, Sang-Eun ; Park, Se-Jun ; Kim, Hak-Sung ; Jang, Hang-Suk ; Kim, Tae-Heok ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 449~461
DOI : 10.7474/TUS.2012.22.6.449
Coal ash generated from thermal power plants is planned to use for mine filling in order to prevent subsidence of the ground. In according, the basic physical properties and flow characteristics were grasped using coal ash from generated Yeongdong thermal power plant, and hydraulic filling experiments were performed a total of eight times by manufacturing the model of 1 inclined shaft in Hanbo coal mine. The specific gravity of coal ash is 2.34, and the result of particle size analysis belongs to silty sand (SM). Coal ash of weight ratio of 60% was used in the filling experiments of the model, since liquefaction have shown in coal ash less than weight ratio of 70% from the result of slump and flow test. The outlet should be located at the bottom of the inclined and vertical shaft, this was favorable way in improving the filling efficiency from the experiment results regardless of groundwater exists.
Equivalent Friction Angle and Cohesion of the Generalized Hoek-Brown Failure Criterion in terms of Stress Invariants
Lee, Youn-Kyou ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 22, issue 6, 2012, Pages 462~470
DOI : 10.7474/TUS.2012.22.6.462
Implementing the generalized Hoek-Brown failure criterion in the framework of the Mohr-Coulomb criterion requires the calculation of the equivalent friction angle and cohesion. In the conventional method based on the Balmer (1952)'s theory, the tangential instantaneous friction angle and cohesion are expressed in terms of the minimum principal stress
, which does not provide the information about the dependency of the equivalent parameters on the hydrostatic pressure and the stress path. In this study, this defect of the conventional method has been overcome by representing the equivalent parameters in terms of stress invariants. Through the example implementation of the new method, the influence of the magnitude of the hydrostatic pressure and the Lode angle on the tangential instantaneous friction angle and cohesion is investigated. It turns out that the tangential instantaneous friction angle is maximum when the stress condition is triaxial extension, while the tangential cohesion is maximum when the stress condition is triaxial compression. The dependency of the equivalent Mohr-Coulomb strength parameters on the hydrostatic pressure and the Lode angle tends to be more substantial for the favorable rockmass of larger GSI value.