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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 16, Issue 6 - Dec 2006
Volume 16, Issue 5 - Oct 2006
Volume 16, Issue 4 - Aug 2006
Volume 16, Issue 3 - Jun 2006
Volume 16, Issue 2 - Apr 2006
Volume 16, Issue 1 - Feb 2006
Selecting the target year
Estimation of Safety in Railway Tunnel by Using Quantitative Risk Assessment
Kim, Do-Sik ; Kim, Do-Hyung ; Kim, Woo-Sung ; Lee, Du-Hwa ; Lee, Ho-Seok ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 357~367
Recently, as the construction of new railway and the relocation of existing line increase, tunnel structures grow longer. The railway fire accidents in long tunnel bring large damages of human life and disaster. The interest of safety in long tunnel have a growing and the safety standard of long tunnel is tightening. For that reason, at the planning of long tunnel, the optimum design of safety facility in long tunnel for minimizing the risks and satisfying the safety standard is needed. For the reasonable design of long railway tunnel considering high safety, qualitative estimation for tunnel safety is required. In this study, QRA (Quantitative Risk Assessment) technique is applied to design of long railway tunnel for assuring the safety function and estimating the risk of safety. The case study for safety design in long railway tunnel is tarried out to verifying the QRA technique for two railway tunnels. Thus, the inclined and vertical shaft for escape way and safety facilities in long tunnel are planned, and the risks of tunnel safety for each case are estimated quantitatively.
Case Study on Failure of Rock Slope Caused by Filling Material of Clay
Kim, Yong-Jun ; Lee, Young-Huy ; Kim, Sun-Ki ; Kim, Ju-Hwa ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 368~376
After heavy rainfall, It was occurred massive plane failure along bedding plane of shale in the center of rock slope. It was observed filling material and trace of underground water leakage around of the slope. We tried to find the cause for slope failure, and the result of examination showed that primary factors of the failure were low shear strength of clay filling material and water pressure formed within tension crack existed in the top of the slope. In this research, in order to examine the features of shear strength of filled rock joint, shear test of filled rock joint was conducted using of artificial filling material such as sand and clay..Also we made an investigation into the characteristics of shear strength with different thickness of filling materials.
Case Study of Blasting Pattern Design for Tunnelling in Which Considered Blast Induced Vibration Affected Across Buildings
Baek, Seung-Kyu ; Choo, Seok-Yeon ; Yoon, Jong-O ; Baek, Un-Il ; Park, Hyung-Seop ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 377~386
In generally blasting pattern design is carried out in-situ borehole blasting test and its analysis. We added the 3D numerical analysis for blast induced vibrations. This paper is case study of 3D numerical analysis in which considered blast induced vibration affected across buildings, and then we design the blasting pattern of tunnel excavation.
A Case Study of Combining NDC Blasting Method and Wide Space Blasting Method to Increase Blast Efficiency
No, Sang-Lim ; Noh, Seung-Hwan ; Lee, Sang-Pil ; Lee, Hoon-Yeon ; Lee, Tai-Ro ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 387~393
This paper introduces the combination of two blasting methods applied to reduce blast-vibration and increase blast efficiency. NDC (New Deck Charge) blasting method using air deck effect with separation tube made of paper was effective to reduce blast-vibration, while blast efficiency was decreased a little in the bottom of a blasthole. Wide Space blasting method has an advantage to control the fragmentation and to increase blast efficiency over conventional blasting methods. In this study new blasting method combining NDC blasting method and Wide Space blasting method was applied to the field, it was confirmed to reduce blast-vibration and increase blast efficiency. It is expected to make useful blasting method to cover the public complaints and to shorten construction time by accumulating blasting data using new method with various conditions.
A Numerical Analysis of Dynamic Behavior of Rock Mass with Intense Discontinuities
Ha, Tae-Wook ; Yang, Hyung-Sik ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 394~404
Dynamic behavior of rock structures depends largely on the dynamic characteristics of ground and input earthquake wave. For blocky rocks with intense discontinuities, the mechanical characteristics of blocks and structural and mechanical characteristics of discontinuities affect overall behavior. In this study, UDEC was adopted to evaluate the dynamic behavior of rocks with various structural characteristics. Obtained results were compared to those of
, a continuum analysis, and the validity of the method was examined for dynamic analysis of discontinuous rocks for earthquake. Analysis considering the discontinuity showed significant changes in structural shape by the influence of joint behavior, and the behavior by continuum analysis was overestimated.
A Study on Field Testing Methods for the Shotcrete Quality Control of Large Underground Spaces
Chang, Seok-Bue ; Lee, Soung-Woo ; Hong, Eui-Joon ; Moon, Sang-Jo ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 405~412
It is well known that shotcrete is the most important support member for the construction of large underground spaces. Generally, the strength of the field shotcrete is heavily dependent on the field mixing and spraying conditions so that it is different from the strength of the shotcrete mixed in laboratories. As a support member, the early strength of shotcrete unlike concrete is very important to the initial stabilization of the underground spaces. Therefore, the field methods to efficiently test the early strength of shotcrete have been highly required. This paper aimed to verify the pneumatic pin penetration test and the point load test for measuring the early strength of the field shotcrete. As a result of the experiments through a series of uniaxial compression, pin penetration, and point load tests for the range of the early shotcrete strength, two equations to estimate reliably the uniaxial compressive strength by the pin penetration and the point load tests were acquired.
Numerical Simulation of Gas Flow within a Radial Fracture Created by Single-Hole Blasting
Jeng, Yong-Hun ; Lee, Chung-In ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 413~421
In order to explain entirely dynamic fracture process induced by blasting in rock mass, it needs to consider detonation pressure and gas pressure acting on blasthole wall simultaneously. In this study, prior to simulating the coupling between gas flow and rock mass, we analyzed effects of gas pressure-time history, length of cracks and equation of state adopted to calculate the gas pressure on the gas flow within a radial fracture created by single-hole blasting. The effects were investigated on two assumptions: (a) the radial fracture was composed of 5 cracks which were 0.01 m in length and 0.001 m in asperity each and (b) the PETN explosive which diameter was 36 mm was charged in a blasthole of 45 mm diameter. It was concluded that the maximum gas pressure and its travel time were dependent on characteristics of charged explosives and geometrical properties of radial fracture.
Proposal for Use of Great Deep Underground Space under Private Land in the Big City
Park, Jung-Joo ;
Tunnel and Underground Space, volume 16, issue 5, 2006, Pages 422~431