• Tunnel and Underground Space
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• v.30 no.2
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• pp.136-148
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• 2020

Nuclear power plants have been operated in Korea since 1978, thus the high-level radioactive waste (HLW) produced from the plants has been accumulated accordingly. Hence, it is urgent to secure a final repository for HLW disposal, however, siting process should be preceded, which usually takes long time, as it requires broad and precise investigation. The investigation is generally carried out in stages, which consists of multidisciplinary approaches. In this study, the case studies mainly pertaining to rock mechanics were conducted. Rock mechanical aspects required in each stage and their applications were investigated and corresponding R&D researches were presented as well. At the same time, current research status in Korea was presented, followed by a brief future research plan with regard to the site investigation. The future research aims to produce fundamental information for siting process, and the compiled cases in this study will be utilized as references in the research.

• Tunnel and Underground Space
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• v.18 no.3
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• pp.175-184
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• 2008

In this study, state-of-the-art of $CO_2$ geological sequestration as a method of greenhouse gas reduction was reviewed. Thermal-Hydraulic-Mechanically(THM) coupled simulation technology and its application to a stability analysis of geological formation due to $CO_2$ injection as well as a leakage path analysis were investigated and introduced.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2004.10a
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• pp.13-22
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• 2004

본 연구에서는 도심지 지하철 터널을 대상으로 지반공학적 위험요소가 공사비 및 공기에 미치는 영향을 정량적으로 평가하기 위하여 잔여 리스크 개념을 이용하여 조사개소의 증가에 따른 공사비 및 공기의 신뢰도를 분석하였다. 신뢰도 분석결과, 지반조사 개소가 증가함에 따라 공사비 및 공기에 대한 위험도가 축소됨을 확인하였으며, 이러한 결과를 통하여 도심지 지하철 터널에서의 지반공학적 위험도 분석의 유용성을 확인하였다.

• Proceedings of the KSEG Conference
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• 2004.03a
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• pp.11001-11050
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• 2004

불연속면 또는 단열은 암반 내의 역학적 분리면을 통칭하는 것으로서 암반 내의 작은 흠집이나 물리적으로 불균질한 곳이나 불연속면 주위에 응력이 집중되어 초래되는 변형의 결과이다. 불연속면은 정압, 지체구조적, 그리고 열적 응력 및 높은 수압에 반응하여 형성되며, 아주 미세한 것부터 대륙 규모에 걸쳐 다양한 크기로 발달한다. 불연속면은 연속체로서의 암반을 물리적으로 분리시키기 때문에 그 자체로서 역학적인 약대에 해당되고, 지하수의 유동 통로의 기능도 하기 때문에 지질공학, 지반공학 및 수리지질학 실무에서 매우 중요한 요소로 작용한다. 경제적으로 중요한 석유, 지열 및 수자원 저류체 역시 단열 암반 내에 형성된다. 불연속면은 오염물질의 이동과 분산을 제어할 뿐만 아니라 암반을 기초로 하거나 대상으로 하는 공학적 구조물과 굴착의 안정성에도 역시 영향을 미친다. (중략)

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 1994.03a
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• pp.62-69
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• 1994

최근 국내에서도 지하공간의 활용성이 부각되면서 다양한 활용방안과 개발구상안이 제시되고 있는데, 이의 실현을 위해서는 지하공간의 합리적 설계, 시공 및 안전유지를 위한 공학적 기술확립이 우선적으로 요구된다. 또한 앞으로 심부 대규모 지하공간개발을 위해서는, 지금까지의 지하천부개발시 중요하게 인식되지 않았던 지하암반의 구조지질적, 역학적, 수리적 특성의 정밀평가가 필요하다. 이러한 현지암반특성 및 특히 지압상태는 기초골격설계와 안정성평가에 있어서 매우 중요한 요소이다. (중략)

• The Journal of Engineering Geology
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• v.17 no.4
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• pp.535-544
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• 2007

Discontinuities developed in a sedimentary rock mass are the most important factor to determine mechanical properties of the rock mass. Parameters described discontinuities in rock mass generally connote heterogeneity and uncertainty. In this study, probabilistic statistics method was used to determine parameters of discontinuities quantitatively and objectively. The field survey was conducted at 33 sedimentary rock slopes in Ulsan area, according to the suggested methods for the quantitative description of discontinuities in rock mass(ISRM, 1978). The engineering geological characteristics of the sedimentary rocks at Ulsan area was determined as probability distribution function deduced by analyzing parameters of discontinuities.

• Korean Journal of Agricultural Science
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• v.23 no.1
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• pp.1-12
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• 1996

To design the safe and rational rock slope, several rock slopes of roads in Kang-won area were analyzed, and the following results were obtained ; 1. The results were analyzed by stereographic projection at the rock slope that the joint was developed. All of the sloped which were designed by standard slope of rock was not considered that the joints were unstable. 2. The relation of rainfall and slope failure, as well as the danger of failure, was very high when the maximum hourly rainfall was larger than 20mm and when there was a 2-day cumulative rainfall that was larger than 200mm. 3. In the design of rock slope, operated by the stereographic projection considering discontinuity. If turn out unstable, it should be analyzed carefully using the limit equilibrium method. 4. In the design of rock slope, it is desirable to consider the discontinuity of rock(joint, bedding, fault).

• Tunnel and Underground Space
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• v.10 no.3
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• pp.395-402
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• 2000

The influence of the mined-out caves on the stability of the high speed railway tunnel was investigated with a series of geological logging and in-situ tests on the one hand, and with the rock mass classification using the multiple regression analysis on the other hand. The rock mass in this area can be classified as 'fair', and the condition of the discontinuities plays the most important role in the classification of the rock mass. The results of the analysis obtained by the FLAC showed that the western part of the tunnel locating at 50m above the mine cavities could be affected by subsidence associated with a considerable deformation, the magnitude of which might depend on the properties of the rock mass.

• Journal of the Korean Geotechnical Society
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• v.23 no.6
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• pp.97-102
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• 2007

Though the stability analysis of soil slopes widely employs the limit equilibrium method, the study on the jointed rock slopes must consider the direction of joint and the characteristics of Joint at the same time. This study analyzes the result of the change in the factors which show the characteristics of discontinuity and the shape factor of rock slopes, and so on, in an attempt to validate the propriety as to the interpretation of jointed rock slope stability which uses the general finite element program. First, the difference depending on the flow rules was compared, and the factor effect study was conducted. The selected independent variables included the direction of joint which displays the mechanical characteristics of discontinuity, adhesive cohesion, friction angle, the inclination and height of rock slope which reveal the shape of slope and surcharge load. And the horizontal displacement was numerically interpreted at the 1/3 point below the slope, a dependent variable, to compare the relative degree of factor effects. The findings of study on factor effects led to the validation that the result of horizontal displacement for each factor satisfied various engineering characteristics, making it possible to be applied to stability interpretation of jointed rock slope. A modelling is possible, which considers the application of the result of real geotechnical surveys & laboratory studies and the non-linear characteristics when designing the rock slope. In addition, the stress change which may result from the natural disaster, such as precipitation, and the construction, can be expressed. Furthermore, as the complicated rock condition and the ground supporting effect can be considered through FEM, it is considered to be very useful in making an engineering decision on the cut-slope, reinforcement and so on.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2000.09a
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• pp.211-222
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• 2000

The design values of rock socketed pile related with properties of rock mass are not clearly established. However, the drilled shafts socketed in rock are widely used as the foundation of large scaled structure. In this study, the characteristics of behavior of rock socketed pile is researched, and the properties of interface between pile and rock considering soil-structure interaction are evaluated for numerical modeling of rock socketed pile based on the previous researches. Based on the properties of interface and rock mass, the behaviors of rock socketed piles are numerically modeled and compared with field measurement. To verify the numerical analysis, a micro pile socketed in rock is modeled and the results of numerical analysis are compared with field measurement. The numerical results show a good agreement with field measured data, especially in terms of load transfer characteristics.