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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 19, Issue 6 - Dec 2009
Volume 19, Issue 5 - Oct 2009
Volume 19, Issue 4 - Aug 2009
Volume 19, Issue 3 - Jun 2009
Volume 19, Issue 2 - Apr 2009
Volume 19, Issue 1 - Feb 2009
Selecting the target year
Management of Risk Scenarios based on Ground Conditions under Construction of a Subsea Tunnel
Park, Eui-Seob ; Shin, Hee-Soon ; Shin, Yong-Hoon ; Kim, Taek-Gon ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 275~286
In order to establish the causes and measures for technical risks that occur in various ground conditions when a subsea tunnel is excavated, it is important to configure expected risk scenarios. In addition, when the risk scenarios are classified because the scenario that occurs along all tunnel route and the scenario limited to some area are considered together, a logical framework with systematic and organized responses can be provided for project managements. In this research, project risk scenarios and management elements were configurated, and the project schedule was established for the management techniques to the risk scenario. The risk scenarios expected in a subsea tunnel were classified into a common risk scenario and a special risk scenario, and the concept which can combine with the project management elements was derived.
Variations of Mechanical Properties of Hallasan Trachyte with respect to the Degree of Weathering
Cho, Tae-Chin ; Lee, Sang-Bae ; Hwang, Taik-Jean ; Won, Kyung-Sik ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 287~303
Rock mass in Baekrokdam at the summit of Hallasan in Jeju island is composed of two volcanic rock types: Baekrokdam trachybasalt at the eastern region and Hallasan trachyte at the western region. On-going rockfall and subsequent collapse of Baekrokdam wall rock are closely linked to the weathering of trachyte distributed in the western region of Baekrokdam. Samples of Hallasan trachyte showing different weathering grades had been collected and the polarizing microscopic observation, X-ray diffraction analysis and analysis for chemical weathering had been conducted. Formation of secondary minerals, especially clay minerals, by chemical weathering has not been identified, but the change of chemical weathering indices indicated that chemical weathering process had been proceeded to the degree for increasing and decreasing the contents of some chemical components. Changes in physical and mechanical rock properties due to weathering has also been examined. Artificial weathering test of freezing-thawing reveals that the process of crack initiation and propagation deteriorated the mechanical characteristics of Hallasan trachyte and
= 1.5 or porosity =
would be the ultimate limiting value induced by the mechanical weathering processes.
A Study on the Stability of Deep Tunnels Considering Brittle Failure Characteristic
Park, Hyun-Ik ; Park, Yeon-Jun ; You, Kwang-Ho ; Noh, Bong-Kun ; Seo, Young-Ho ; Park, Chan ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 304~317
Most crystalline rocks have much higher compressive strength than tensile strength and show brittle failure. In-situ rock mass, strong enough in general sense, often fails in brittle manner when subjected to high stress exceeding strength in due of geometrically induced stress concentration or of high initial stress. Therefore, it is necessary to verify the brittle failure characteristics of rock and rock mass for proper stability assessment of underground structures excavated in great depths. In this study, damage controlled tests were conducted on biotite-granite and granitic gneiss, which are the two major crystalline rock types in Korea, to obtain the strain dependency characteristics of the cohesion and friction angle. A Cohesion-Weakening Friction-Strengthening (CWFS hereafter) model for each rock type was constructed and a series of compression tests were carried out numerically while varying confining pressures. The same tests were also conducted assuming the rock is Mohr-Coulomb material and results were compared.
Analysis on Weathering Characteristics of Rocks in Dokdo by Accelerated Weathering Test
Song, Won-Kyong ; Woo, Ik ; Kim, Bok-Chul ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 318~327
Accelerated weathering tests was executed to understand the physical characteristics of rocks in Dokdo. For the tests rock samples including trachytic andestes, andesite dyke and ash tuff were taken in place. Double soxhlet extractor and peristatic pump were used for accelerating the weathering processes. After the tests for 4 months, the variations of superficial structure, microscopic structure and strength of rock samples were observed.
Suggestions for a New Method of Schmidt Hammer Blowing and Data Analysis on Rocks (I)
Min, Tuk-Ki ; Moon, Jong-Kyu ; Lee, Sang-Il ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 328~338
Schmidt hammer test as an indirect method has so far been widely applied for determining the physical properties of intact rock, and many researchers have developed procedures for its use on rock cores, blocks and in field. Though many methods have developed upto date for indirect using, the almost were single blow which has many errors. The purpose of this study was to evaluate the established as for ASTM, ISRM, BSI, Poole & Farmer and Hucka method and to suggest a new optimum test method and statistical analysis on rocks. The finding has indicated that succeeding blow has served as an optimal to predict physical properties of rocks. To conduct the experiment, researchers have examined 150 rock blocks, which include igneous, metamorphic and sedimentary rocks in Korea nation wide.
Mechanism Analysis of Tunnel Collapse in Weak Ground
Lee, Jae-Ho ; Jeong, Yun-Young ; Kim, Young-Su ; Moon, Hong-Duk ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 339~347
Despite the recent improvement in tunnel excavation technique, Tunnel collapse accidents still happen. This paper suggest two typical cases in unconsolidated ground condition. Collapse causes of each case were analyzed by the measurement records and numerical simulation, and then mechanism of tunnel collapse was investigated about each case. From this study, the crucial indicators of tunnel collapse were the variation of shear strain and ground water level, also, tunnel collapse deeply related to how shear deformation around tunnel was developed according to the excavation step.
Analysis of oscillatory responses of slug tests in a crystalline rock aquifer
Ryu, I. ; Ji, S.H. ; Koh, Y. ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 348~354
Slug test is a common characterization method that estimates aquifer hydraulic conductivity rapidly and economically. To characterize the hydraulic property near the borehole YS-4 in the Korea Atomic Energy Research Institute (KAERI) site, slug tests were performed, and oscillatory hydraulic responses were observed. We analyzed the observations with the modified Hvorslev and Bouwer&Rice methods considering the casing inertia, and then the results were compared with those from the general Hvorslev and Bouwer&Rice methods. The estimated hydraulic conductivities from the modified methods are ranged from
m/sec, but those from the general ones are ranged from
m/s, which shows that the oscillatory responses should be analyzed with consideration of the flowing water inertia effect.
A New Method for Elasto-Plastic Analysis of Concrete Lining Installed in a Deep Circular Tunnel
Lee, Youn-Kyou ; Park, Kyung-Soon ; Song, Won-Kyong ; Park, Chul-Whan ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 355~365
This paper proposes an elasto-plastic finite difference method which is useful for the stability evaluation of concrete lining installed in a deep circular tunnel. Mohr-Coulomb criterion is assumed for the condition of yielding in both the rock mass and concrete lining. In order to take into account the installation delay of lining after the excavation, the outer boundary pressure acting on the lining was calculated with the consideration of the convergence occurred before the lining installation. The distributions of stress and displacement in the rock mass and lining were calculated based on the method proposed Lee & Pietruszczak (2008). The applicability of the proposed method was demonstrated by conducting the elasto-plastic analysis of concrete lining supporting an imaginary compressed air storage tunnel. The analysis result revealed that the exact determination of the boundary pressures acting on the concrete lining is of importance in the stability analysis of concrete lining.
Study on the Precise Controlling of Fracture Plane in Smooth Blasting Method
Cho, Sang-Ho ; Jeong, Yun-Young ; Kim, Kwang-Yum ; Kaneko, Katsuhiko ;
Tunnel and Underground Space, volume 19, issue 4, 2009, Pages 366~372
Recently, in order to achieve smooth fracture plane and minimize the excavation damage zone in rock blasting, controlled blasting methods which utilize new technologies such as electronic delay detonator (EDD) and a notched charge hole have been suggested. In this study, smooth blastings utilizing three wing type notched charge holes are simulated to investigate the influence of explosive initial density on the resultant fracture plane and damage zone using dynamic fracture process analysis (DFPA) code. Finally, based on the dynamic fracture process analyses, novel smooth blasting method, ED-Notch SB (Electronic Detonator Notched Charge Hole Smooth Blasting) is suggested.