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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 18, Issue 6 - Dec 2008
Volume 18, Issue 5 - Oct 2008
Volume 18, Issue 4 - Aug 2008
Volume 18, Issue 3 - Jun 2008
Volume 18, Issue 2 - Apr 2008
Volume 18, Issue 1 - Feb 2008
Selecting the target year
Review on the detailed standards for Quantitative Risk Analysis in High Speed Railway Tunnels
Choi, Won-Il ; Choi, Jeong-Hwan ; Moon, Yeon-Oh ; Kim, Seon-Hong ; Yoo, Ho-Sik ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 393~407
To protection of fire accident and to minimize danger of spreading the disaster. in railway tunnel, MCT (the Ministry of Construction and Transportation) published "Rules about the Safety Standard of Railroad (2005.10.27)" and "The Detailed Safety Standard of Railroad (2006.9.22)". QRA(Quantitative Risk Analysis) results are applied to establish the fire protection facilities in railway tunnel so that institute the reasonable application about the fire safety facilities However, it is difficult to perform the fire safety design due to lack of the detailed standards about event scenario, fire intensity, incidence rate of accidents etc. Therefore, This paper introduces the practical method about detailed standards of QRA.
Analysis of Acquaintance Relations Between Parameters of RMR and Q Rock Mass Classification System
Synn, Joong-Ho ; Park, Chul-Whan ; SunWoo, Choon ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 408~417
Rock mass classification methods such as RMR and Q system have different characteristics each other in parameters considered and applications, and so it is very important to prescribe the relationship between parameters for the analysis of correlativity of these methods. With the Held data of RMR and Q estimation in road construction sites, the acquaintance relations between RMR and Q of rock mass classifications are analyzed. The correlation equations between parameters of RMR and Q, matrix of correlation coefficients and the generalized form of acquaintance relation matrix are derived. This acquaintance relation matrix can be further extended to the form of generalized acquaintance relation network, and could be used to analyze the correlativity and to enhance the utility of common rock mass classification methods.
Establishment of a Safe Blasting Guideline for Pit Slopes in Pasir Coal Mine
Choi, Byung-Hee ; Ryu, Chang-Ha ; SunWoo, Coon ; Jung, Yong-Bok ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 418~426
A surface blasting method with a single tree face is currently used in Pasir Coal Mine in Indonesia. The single free face is usually the ground surface. This kind of blasting method is easy to use but inevitably causes enormous ground vibrations, which, in turn, can affect the stability of the slopes comprising the various boundaries of the open pit mine. In this regard, we decided to make a specific blasting guideline for the control of found vibrations to ensure the safety of the pit slopes and waste dumps of the mine. Firstly, we derived a prediction equation for the ground vibration levels that could be occurred during blasting in the pits. Then, we set the allowable levels of ground vibrations for the pit slopes and waste dumps as peak particle velocities of 120mm/s and 60mm/s, respectively. From the prediction equation and allowable levels, safe scaled distances were established for field use. The blast design equations for the pit slopes and waste dumps were
respectively. We also provide several standard blasting patterns for the hole depths of
Study on the Effect of Bolt and Sub-bench on the Stabilization of Tunnel Face through FEM Analysis
Kim, Sung-Ryul ; Yoon, Ji-Sun ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 427~435
In this paper, review was made for the excavation method and optimum bench length for unstable tunnel face in case of rock classification type V in order to make the best use of in-situ bearing capacity. 3D FEM analyses were performed to investigate the influences on the tunnel face and adjacent area with regard to the pattern and number of bolts when face bolts were used as a supplementary measure. As a result of this study, full section excavation method with sub-bench is effective in reducing the displacement greatly due to early section closure. Displacement-resistant effects in accordance with the bolting patterns are grid type, zig-zag type and then circular type in order of their effect. And horizontal extrusion displacement of tunnel face reduces as the number of bolts increase. A grid type face bolt covering
of tunnel face could secure the face stability in case of full section excavation method with sub-bench.
A Study on the Volumetric Expansion Ratio of Rock Mass for Subsidence Behavior Analysis II
Lee, Seung-Joong ; Jung, Yong-Bok ; Choi, Sung-O. ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 436~446
The volumetric expansion ratio of rock mass on the subsidence occurrence area can explain why the depth of the surface subsidence is lower than the height of an opening; it is because the empty space of the gangway is filled with the broken rock. But, until now, when the surface subsidence mechanism is studied without consideration of the volumetric expansion ratio, it is usually overlooked that the amount of subsidence occurrence can be overestimated. Therefore, in this study, the authors researched the subsidence occurrence mechanism with a new theoretical approaching method. The volumetric expansion ratio obtained from this method has been applied to the numerical simulations. The authors adopted the UDEC(Universal Distinct Element Code) for their discontinuum numerical analysis, because this program has an advantage for analyzing the behavior of rock discontinuities.
Determination of Critical Slope Height for Large Open-pit Coal Mine and Analysis of Displacement for Slope failure Prediction
Jung, Yong-Bok ; SunWoo, Choon ; Lee, Jong-Beom ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 447~456
Open-pit mine slope design must be carried out from the economical efficiency and stability point of view. The overall slope angle is the primary design variable because of limited support or reinforce options available. In this study, the slope angle and critical slope height of large coal mine located in Pasir, Kalimantan, Indonesia were determined from safety point of view. Failure time prediction based on the monitored displacement using inverse velocity was also conducted to make up fir the uncertainty of the slope design. From the study, critical slope height was calculated as
under safety factor guideline (SF>1.5) and
overall slope angle but loom is recommended as a critical slope height considering the results of sensitivity analysis of strength parameters. The results of inverse velocity analysis also showed good agreement with field slope cases. Therefore, failure of unstable slope can be roughly detected before real slope failure.
A Study on the Damage Assesment of Artificial Brittle Materials subjected to Impact Leading
Cho, Sang-Ho ; Jo, Seul-Ki ; Cheon, Dae-Sung ; Synn, Joong-Ho ; Yang, Hyung-Sik ; Kim, Seung-Kon ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 457~464
Dynamic fracture mechanism of rock is important to improve rapid excavation method and develop precise damage assesment of rock mass in the vicinity of an excavation. In order to investigate dynamic fracture characteristics and dynamic damage mechanism of brittle materials, this study employed pulse shape-controlled Split Hopkinson Pressure Bar (SHPB) system. The P- and S-wave velocities of the tested samples were measured before and after tests to examine damage of the samples. The decay ratios of the Ultrasonic wave velocities increased with impart velocities and the samples which have lower strength showed higher permanent strain significantly.
Methodology to Quantify Rock Behavior in Shallow Rock Tunnels by Analytic Hierarchy Process and Rock Engineering Systems
Yoo, Young-Il ; Kim, Man-Kwang ; Song, Jae-Joon ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 465~479
For the quantitative identification of rock behavior in shallow tunnels, we recommend using the rock behavior index (RBI) by the analytic hierarchy process (AHP) and the Rock Engineering Systems (RES). AHP and RES can aid engineers in effectively determining complex and un-structured rock behavior utilizing a structured pair-wise comparison matrix and an interaction matrix, respectively. Rock behavior types are categorized as rock fall, cave-in, and plastic deformation. Seven parameters influencing rock behavior for shallow depth rock tunnel are determined: uniaxial compressive strength, rock quality designation (RQD), joint surface condition, stress, pound water, earthquake, and tunnel span. They are classified into rock mass intrinsic, rock mass extrinsic, and design parameters. An advantage of this procedure is its ability to obtain each parameter's weight. We applied the proposed method to the basic design of Seoul Metro Line O and quantified the rock behavior into RBI on rock fall, cave-in, and plastic deformation. The study results demonstrate that AHP and RES can give engineers quantitative information on rock behavior.
Assessment of Hydraulic Drilling Data on Homogeneous Rock Mass
Kim, Kwang-Yeom ; Kim, Chang-Yong ; Kim, Kwang-Sik ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 480~490
The drilling monitoring is a technique to assess rock mass properties by analyzing the mechanical quantities measured by drilling process. Since drilling survey can be conducted on real-time-basis for excavating blast holes or rockbolt holes, it may enables fast and quantitative prediction and evaluation of rock mass. Though a number of studies have been conducted on the drilling data, the selection of drilling parameters and numerical quantification of mechanical quantities or rock mass have not been well established yet. In this study, drilling tests were conducted with homogeneous rock specimen to identify drilling parameters and the relation of the drilling data. As a result, it is verified that above all drilling parameters, the percussion was the most important factor on the excavatability of hydraulic drilling.
Study on the Estimation of Safety Zone and the Movement of Ground at the Inter-Crossing Tunnel
Kim, Woo-Sung ; Yoo, Dong-Uk ; Lee, Sang-Eun ;
Tunnel and Underground Space, volume 18, issue 6, 2008, Pages 491~502
A certain range of the original ground around the tunnel should be preserved to ensure structural safety of the tunnel when other structures are made around the tunnel, and thus this range is defined as safety zone of the tunnel. The main points to ensure the stability of an existing tunnel when constructing a new tunnel in an inter-crossing area are distance between two tunnels, size of the new tunnel, excavation method for the new tunnel, ground condition around the tunnel, and lining type of the existing tunnel etc. When the new tunnel is excavated above the existing tunnel, the existing tunnel is likely to suffer deformation at a crown zone, damage of arching effect, and live load of the new tunnel etc. On the other hand, when the new tunnel is excavated below the existing tunnel, the existing tunnel is likely to be damaged due to settlement. This study has been made on the behavior of the existing tunnel by means of model test and numerical analysis when the new tunnel is excavated below the existing tunnel. Safety zone of the tunnel was estimated by the results of strength/stress ratio obtained from numerical analysis, and the movement of ground was estimated by the model test. The results of earth pressure, ground displacements, and convergence of the tunnel obtained from model test were compared with those of numerical analysis, and show a similar trend.