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Chae, Byung-Gon,Choi, Jung-Hae,Ichikawa, Yasuaki,Seo, Yong-Seok Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.1
To compute a permeability coefficient along a rough fracture that takes into account the fracture geometry, this study performed detailed measurements of fracture roughness using a confocal laser scanning microscope, a quantitative analysis of roughness using a spectral analysis, and a homogenization analysis to calculate the permeability coefficient on the microand macro-scale. The homogenization analysis is a type of perturbation theory that characterizes the behavior of microscopically inhomogeneous material with a periodic boundary condition in the microstructure. Therefore, it is possible to analyze accurate permeability characteristics that are represented by the local effect of the facture geometry. The Cpermeability coefficients that are calculated using the homogenization analysis for each rough fracture model exhibit an irregular distribution and do not follow the relationship of the cubic law. This distribution suggests that the permeability characteristics strongly depend on the geometric conditions of the fractures, such as the roughness and the aperture variation. The homogenization analysis may allow us to produce more accurate results than are possible with the preexisting equations for calculating permeability.
Changes of permeability characteristics dependent on damage process in granites
Byung-Gon Chae,정교철,Hak-Joon Kim,Jae-Hyeon Park,Takafumi Seiki 한국지질과학협의회 2005 Geosciences Journal Vol.9 No.4
Fracture properties are closely related to the per-meability characteristics of massive crystalline rocks. In order tounderstand the changes of rock permeability related to the dam-age process, this study performed characterization on changes ofhydraulic properties with both in-situ tests and laboratory tests.The results of in-situ tests showed that permeability coefficientsThe differences are related to the conditions of fracture distribu-tion due to rock damage in the process of tunneling. This studyperformed uniaxial compressive tests (UCT) and water injectiontests in order to understand the relationship between the damageprocess and changes of permeability characteristics by the labo-ratory tests. Crack distribution on each damage grade wasobserved by the acetate peel. According to the results of the tests,the strongly damaged specimens with crack length density of morethan 0.6 cm-1 showed higher values of permeability coefficientsimens have persistent cracks and good connectivity throughoutthe rock specimens. It indicates that rock damage influences onthe permeability characteristics in rocks.
채병곤 ( Byung Gon Chae ),김원영 ( Won Young Kim ),조용찬 ( Yong Chan Cho ),김경수 ( Kyeong Su Kim ),이춘오 ( Choon Oh Lee ),최영섭 ( Young Sup Choi ) 대한지질공학회 2004 지질공학 Vol.14 No.2
이 연구는 자연사면에서 발생하는 토석류(debris flow) 산사태의 확률론적 예측을 위해 로지스틱 회귀분석(logistic regression analysis)을 이용하여 변성암 및 화강암 분포지에 적용할 수 있는 예측모델을 개발한 것이다. 산사태 예측모델을 개발하기 위해 경기 남·북부지역과 경북 상주지역에서 발생한 산사태 자료를 현장조사와 실내토질시험을 통해 직접 획득·분석하였다. 산사태 발생에 영향을 미치는 인자는 기초 통계분석은 물론 로지스틱회귀분석을 실시하여 최종적으로 7개 영향인자를 선정하였다. 이들 7개 인자는 지형요소 2개와 지질 및 토질특성 요소 5개로 구성되어 있고, 각 인자별 가중치를 부여한 점이 큰 특징이다. 개발된 모델은 신뢰성 검증을 수행한 결과 90.74%의 예측율을 확보한 것으로 나타났다. 이 모델을 이용하여 산사태 발생가능성을 확률적·정량적으로 예측할 수 있게 되었다. In this study, a probabilistic prediction model for debris flow occurrence was developed using a logistic regression analysis. The model can be applicable to metamorphic rocks and granite area. In order to develop the prediction model, detailed field survey and laboratory soil tests were conducted both in the northern and the southern Gyeonggi province and in Sangju, Gyeongbuk province, Korea. The seven landslide triggering factors were selected by a logistic regression analysis as well as several basic statistical analyses. The seven factors consist of two topographic factors and five geological and geotechnical factors. The model assigns a weight value to each selected factor. The verification results reveal that the model has 90.74% of prediction accuracy. Therefore, it is possible to predict landslide occurrence in a probabilistic and quantitative manner.
RTI 경보모델을 이용한 강원도 인제지역의 산사태 가능성 및 발생시간 분석 사례 연구
채병곤 ( Byung Gon Chae ),( Ko Fei Liu ),조용찬 ( Yong Chan Cho ) 대한지질공학회 2008 지질공학 Vol.18 No.2
이 연구는 집중호우시 산사태의 발생가능성과 발생시간을 사전에 예측하기 위한 노력의 일환으로 기존에 개발된 RTI경보모델을 우리나라에 적용 분석한 사례이다. RTI(Rainfall Triggering Index)는 강우강도(I)와 유효 누적강우량(Rt)의 곱으로 정의되는 것으로서, 강우기간 동안 특정 시간(t)에서 산사태가 발생할 가능성을 평가하는데 사용된다. RTI의 상부임계값(RTIUC)과 하부임계값(RTILC)은 과거 산사태 발생시 강우자료 분석을 통해 각 지역별로 설정할 수 있으며, 강우강도가 상부임계값을 초과할 때 실제 산사태가 발생하는 것으로 이해할 수 있다. 이러한 분석은 궁극적으로 향후 집중호우가 내릴 경우 특정지역의 산사태 발생가능성은 물론 산사태 발생시기를 예상할 수 있으며, 이를 토대로 사전에 산사태 발생경보를 발령하는데 중요한 근거로 활용될 수 있다. 이와같은 이론을 우리나라에 적용하기 위해 2006년 7월 13일부터 7월 19일까지 강원도 인제군 일대에 내린 강우자료와 산사태 발생과의 관계를 분석한 결과, 실제 산사태가 발생한 7월 16일 오전 11시경을 기준으로 23시간, 11시간, 9시간 전에 강우강도가 RTI의 상부임계값을 초과하였다. 이를 토대로 이와 같은 세 차례에 걸친 산사태 경보의 발령이 필요하였음을 알 수 있었다. This study is a case study for application of the RTI warning model to Korea which was previously developed to predict landslide potential and occurrence time during a rainfall event. The rainfall triggering index (RTI) is defined as the product of the rainfall intensity I (mm/hr) and the effective accumulated rainfall Rt (mm). This index is used to evaluate the landslide and debris-flow occurrence potential at time t during a rainfall event. The upper critical value (RTI(UC)) of RTI and the lower critical value (RTI(LC)) of RTI can be determined by historical rainfall data of a certain area. When the rainfall intensity exceeds the upper critical value, there are high potential to occur landslides. The analysis result can predict landslide occurrence time of an area during a rainfall event as well as landslide potential. The result can also be used as an important data to issue early-warning of landslides. In order to apply the RTI warning model to Korea, this study analyzed rainfall data and landslides data in Inje county, Gangwon province, Korea from July 13 to July 19, 2006. According to the analysis result, the rainfall intensity exceeded the upper critical value 23 hours ago, 11 hours ago, and 9 hours ago from 11:00 in the morning, July 16. Therefore, landslide warnings would be issued three times for people evacuation for avoiding or reducing hurts and damages from landslides in mountainous areas of Inje.
지질특성 관측용 센서를 이용한 산사태 모니터링 기법 현황
채병곤 ( Byung Gon Chae ),송영석 ( Young Suk Song ),최정해 ( Junghae Choi ),김경수 ( Kyeong Su Kim ) 한국센서학회 2015 센서학회지 Vol.24 No.5
There are many landslides occurred by typhoons and intense rainfall during the summer seasons in Korea. To predict a landslide triggering it is important to understand mechanisms and potential areas of landslides by the geological approaches. However, recent climate changes make difficult to predict landslide based on only conventional prediction methods. Therefore, the importance of a real-time monitoring of landslide using various sensors is emphasized in recent. Many researchers have studied monitoring techniques of landslides and suggested several monitoring systems which can be applicable to the natural terrain. Most sensors of landslide monitoring measure slope displacement, hydrogeologic properties of soils and rocks, changes of stress in soil and rock fractures, and rainfall amount and intensity. The measured values of each sensor are transmitted to a monitoring server in real-time. The ultimate goal of landslide monitoring is to warn landslide occurrence in advance and to reduce damages induced by landslides. This study introduces the current situation of landslide monitoring techniques in each country.