• Title/Summary/Keyword: 암반 특성

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A Study on the Characteristics of Cooperating Charge considering Dominant Frequency (주 주파수를 고려한 협동장약 특성에 관한 연구)

  • Kim Jong-In;Kang Choo-Won
    • Tunnel and Underground Space
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    • v.15 no.4 s.57
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    • pp.316-323
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    • 2005
  • As a result of waveform analysis, the separation of waveform found that high frequency well accomplishes but low frequency doesn't accomplish that. The data which measured less than 60 Hz and more than 60 Hz was analysed to examine the relation between cooperating charge and frequency. The measured data of more than 70 Hz was also analysed to consider the characteristics of high frequency.

낙동강 함안군 칠서 강변여과 개발 예정지역의 수리지구화학적 특성조사

  • 김주환;백건하;김형수;김진삼;윤성택
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.09a
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    • pp.561-564
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    • 2003
  • 강변여과수 개발 예정지역인 함안군 칠서지역의 수질특성을 알아보기 위해 2003년 4월과 2003년 8월 2회에 걸쳐 강변여과수 양수정, 관측정, 주변지역 지하수 및 낙동강 원수 등 총 38개의 물시료를 채수하여 분석하였다. 용존 이온 분석 결과 연구 지역 지하수의 경우는 Ca-HCO$_3$ 유형 또는 Ca-Cl 유형에 속하며, 조사 지점에 따라 충적층 및 암반 지하수의 특징이 확연히 구분되었다. 조사된 지하수의 경우, 질산성질소와 철, 망간의 농도가 다른 성분에 비해 상대적으로 높은 것으로 나타났으며, 그 외의 중금속의 오염은 미미한 것으로 나타난다. 낙동강 원수의 경우 질산성 질소, 철, 망간은 지하수에 비해 낮은 것으로 나타났으나, 조류의 영향으로 매우 높은 pH 값을 보여주었다. 채수된 전체 시료의 분석 결과, 질산성질소(39.1%), 철(13%), 망간(39.1%)이 주로 먹는 물 수질기준을 초과하는 항목으로 나타났다.

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단일공에서 정압주입시험을 이용한 단열투수량계수 산출

  • Park Jun-Hyeong;Park Gyeong-U;Bae Dae-Seok;Kim Gyo-Won
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2005.04a
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    • pp.288-291
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    • 2005
  • 방사성폐기물 처분연구의 일환으로 단열 암반지역의 지하수 유동에 있어서 각 단열조의 투수량계수를 알아보기 위하여 연구지역에 설치된 3기의 시추공에서 초음파 검층, 정압주입시험 및 유동차원 해석을 수행하였다. 단열은 방향성, 틈의 크기 등의 그 분포 특성으로 인해 각 시험구간내의 지하수 유동에 있어서, 유동형태 및 단열투수량계수를 좌우하므로 일반적으로 수리특성에 널리 이용되는 다공성매질의 연속체 개념을 통한 해석의 적용에 신중성을 고려할 필요가 있다.

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A spatial distribution study of Aquifer Using Geostatistical analysis at the Ulsan Manufacturing Industry City (지구통계기법을 이용한 대수층의 공간적 분포연구)

  • 김병우;정상용;강동환;이민희;성익환;조병욱;이승엽
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.04a
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    • pp.229-232
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    • 2003
  • 본 연구는 울산지역 지하수오염 저감기술의 개발에 필요한 대수층의 공간적 분포특성을 파악하는 데 목적이 있다. 울산 공업도시의 대수층에서 공간적 분포특성을 파악하기 위하여 시추조사가 많이 필요 하지만 비용 및 시간 관계상 어려움이 있기 때문에, 지질조사 보고서나 논문 등에서 지하수자료와 시추 자료를 획득하여 지구통계기법을 이용한 울산지역 대수층의 공간적 분포를 모사하였다. 그리고 인구가 밀집되어 있는 남구와 중구를 중심으로 대수층 단면 분포를 모사하였다. 이와 같은 분석결과는 표토층 하부경계부와 풍화대 하부경계부에서 유사한 분포심도로 나타났으며, 지하수 수위는 표토층 하부경계와 암반층 상부경계부인 풍화대에 분포하는 것으로 나타났다.

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Experimental Techniques for Dynamic Mechanical Characteristics of Rock Materials (암석의 동역학적 특성 규명을 위한 실험기법의 분석)

  • Oh, Se-Wook;Cho, Sang-Ho
    • Explosives and Blasting
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    • v.38 no.3
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    • pp.30-43
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    • 2020
  • Rock dynamics is a relatively new discipline to study the mechanical behaviors of rock materials (or rock masses) under dynamic loading conditions. Many rock mechanics and rock engineering issues are concerned with the dynamic phenomena such as mining development, civil engineering, earthquake, military science, and various disasters. The significance of rock dynamic researches has been increased in these days. This paper introduces conventional experimental techniques for rock dynamic experimental methods and the particular characteristics of rock dynamic behaviors with several remarkable recent studies.

Anisotropy Failure Characteristics of Shales (셰일(혈암)의 이방성 파괴 특성)

  • 김영수;허노영;방인호;이재호;성언수
    • Journal of the Korean Geotechnical Society
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    • v.17 no.2
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    • pp.13-20
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    • 2001
  • 외부하중의 작용방향에 의한 암반의 강도 및 변형이 달라지는 것을 강도 이방성, 또는 변형이방성이라 정의되어 진다. 강도 또는 변형 이방성은 층리진 퇴적압, 박층모양의 변성암, 균일하게 절리가 나있는 암석에서 흔히 볼 수 있다. 이러한 강도이방성에 대한 경험적 및 이론적 관점에서의 파괴 규준은 Jaeger(1960), McLamore와 Gray(1967), Donath(1972), Nova(1980), Hoek과 Brown(1980), Ramamurthy(1985)등 많은 학자들에 의해서 연구되어져 왔다. 본 논문에서는 셰일에 대한 삼축 압축시험을 통하여 층리각도에 따른 강도 이방성을 확인하고, 점착력, 내부 마찰각 및 재료상수의 물성치를 회귀분석을 통하여 구하였다. 또한, 수정된 Hoek과 Brown, Ramamurthy 등의 식을 통해 기존의 파괴규준식 및 수정된 식이 강도이방성적 특성을 나타내는 이 지역 셰일에 대한 적용가능성을 논하였다.

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Laboratory Study of the Shear Characteristics of Fault Gouges Around Mt. Gumjung, Busan (부산 금정산일대에 분포하는 단층비지의 전단특성에 관한 실험적 고찰)

  • Woo, Ik
    • The Journal of Engineering Geology
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    • v.22 no.1
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    • pp.113-121
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    • 2012
  • The mechanical characteristics of a fault gouge from near Mt. Kumjung in Kumjung-Gu, Busan, were estimated from laboratory tests on different joint models. Fault gouge samples and joint samples in biotite granite were obtained from boreholes in the study area that had penetrated small faults associated with the Dongnae and Yangsan faults. XRD and SEM analyses revealed that for the fault gouge consists of several clay minerals with tabular structure (kaolinite, montmorillonite, illite, sericite), which could cause the considerable reduction of shear strength when wet. The shear strength of the fault gouge was obtained from direct shear tests of the fault gouge itself and from direct shear tests of several natural/artificial joint surfaces coated with fault gouge. The results indicate that the reduction of shear strength is more abrupt for the joint surfaces coated with fault gouge compared with uncoated joint surfaces, and that the friction angle of the fault gouge between joint surfaces is much lower than the internal friction angle of the fault gouge itself. Fault gouges in contact with rock, therefore, could have a stronger negative effect on the stability of structures in rock masses than the fault gouge itself.

Rock Slope Failure Analysis and Landslide Risk Map by Using GIS (GIS를 이용한 암반사면 파괴분석과 산사태 위험도)

  • Kwon, Hye-Jin;Kim, Gyo-Won
    • Journal of the Korean Geotechnical Society
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    • v.30 no.12
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    • pp.15-25
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    • 2014
  • In this study, types of rock slope failure are analyzed by considering both joint characteristics investigated on previous landslide regions located at northern part of Mt. Jiri and geographic features of natural slopes deduced from GIS. The landslide prediction map was produced by superposing the frequency ratio layers for the six geographic features including elevation, slope aspect, slope angle, shaded relief, curvature and stream distance, and then the landslide risk map was deduced by combination of the prediction map and the damage map obtained by taking account of humanity factors such as roads and buildings in the study area. According to analysis on geographic features for previous landslide regions, the landslides occurred as following rate: 88% at 330~710 m in elevation, 77.7% at $90{\sim}270^{\circ}$ in slope aspect, 93.9% at $10{\sim}40^{\circ}$ in slope angle, 82.78% at grade3~7 in shaded relief, 86.28% at -5~+5 in curvature, and 82.92% within 400m in stream distance. Approximately 75% of the landslide regions belongs to the region of 'high' or 'very high' grade in the prediction map, and 13.27% of the study area is exposed to 'high risk' of landslide.

Characterization of Groundwater Level and Water Quality by Classification of Aquifer Types in South Korea (국내 대수층 유형 분류를 통한 지하수위와 수질의 특성화)

  • Lee, Jae Min;Ko, Kyung-Seok;Woo, Nam C.
    • Economic and Environmental Geology
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    • v.53 no.5
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    • pp.619-629
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    • 2020
  • The National Groundwater Monitoring Network (NGMN) in South Korea has been implemented in alluvial/ bedrock aquifers for efficient management of groundwater resources. In this study, aquifer types were reclassified with unconfined and confined aquifers based on water-level fluctuation and water quality characteristics. Principal component analysis (PCA) of water-level data from paired monitoring wells of alluvial/bedrock aquifers results in the principal components of both aquifers showing similar water-level fluctuation pattern. There was no significant difference in the rate of water-level rises responding to precipitations and in the NO3-N concentrations between the alluvial and bedrock aquifers. In contrast, in the results classified with the hydrogeological type, the principal components of water level were different between unconfined and confined conditions. The water-level rises to precipitation events were estimated to be 4.6 (R2=0.8) in the unconfined and 2.1 (R2=0.4) in the confined aquifers, respectively, indicating less impact of precipitation recharge to the confined aquifer. The confined aquifers have the average NO3-N concentration below 3 mg/L, implying the natural background level protected from the sources at surface. In summary, reclassification of aquifers into hydrogeological types clearly shows the differences between unconfined and confined aquifers in the water-level fluctuation pattern and NO3-N concentrations. The hydrogeologic condition of aquifer could improve groundwater resource management by providing critical information on groundwater quantity through recharge estimation and quality for protection from potential contamination sources.

Interpretation Method of Eco-Cultural Resources from the Perspective of Landscape Ecology in Jeju Olle Trail (제주 올레길 생태문화자원 경관생태학적 해석기법 연구)

  • Hur, Myung-Jin;Han, Bong-Ho;Park, Seok-Cheol
    • Journal of the Korean Institute of Landscape Architecture
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    • v.49 no.2
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    • pp.128-140
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    • 2021
  • This study applied the theory of Landscape Ecology to representative resources of Jeju Olle-gil, which is a representative subject of walking tourism, to identify ecological characteristics and to establish a technique for landscape ecological analysis of Olle-gil resources. Jeju Olle Trail type based on the biotope type, major land use, vegetation status around Olle Trail and roads were divided into 12 types. Based on the type of ecological tourism resource classification, the Jeju Olle-gil walking tourism resource classification was divided into seven types of natural resources and seven types of humanities resources, and each resource was characterized by Geotope, Biotope, and Anthropopope, just like the landscape ecology system. Geotope resources are strong in landscape characteristics such as coast and beach, rocks, bedrocks, waterfalls, geology and Jusangjeolli Cliff, Oreum and craters, water resources, and landscape viewpoints. The Biotope resources showed strong ecological characteristics due to large tree and protected tree, Gotjawal, forest road and vegetation communities, biological habitat, vegetation landscape view point. Antropotope include Culture of Jeju Haenyeo and traditional culture, potting and lighthouses, experience facilities, temples and churches, military and beacon facilities, other historical and cultural facilities, and cultural landscape views. Jeju Olle Trail The representative resources for each type of Jeju Olle Trail are coastal, Oreum, Gotjawal, field and Stonewall Fencing farming land, Jeju Village and Stone wall of Jeju. In order to learn about the components and various functions of the resources representing the Olle Trail's ecological culture, the landscape ecological technique was interpreted. Looking at the ecological and cultural characteristics of coastal, the coast includes black basalt rocks, coastal vegetation, coastal grasslands, coastal rock vegetation, winter migratory birds and Jeju haenyeo. Oreum is a unique volcanic topography, which includes circular and oval mountain bodies, oreum vegetation, crater wetlands, the origin and legend of the name of Oreum, the legend of the name of Oreum, the culture of grazing horses, the use of military purposes, the object of folk belief, and the view from the summit. Gotjawal features rocky bumps, unique microclimate formation, Gotjawal vegetation, geographical names, the culture of charcoal being baked in the past, and bizarre shapes of trees and vines. Field walls include the structure and shape of field walls, field cultivation crops, field wall habitats, Jeju agricultural culture, and field walls. The village includes a stone wall and roof structure built from basalt, a pavilion at the entrance of the village, a yard and garden inside the house, a view of the lives of local people, and an alleyway view. These resources have slowly changed with the long lives of humans, and are now unique to Jeju Island. By providing contents specialized for each type of Olle Trail, tourists who walk on Olle will be able to experience the Olle Trail in depth as they learn the story of the resources, and will be able to increase the sustainable use and satisfaction of Jeju Olle Trail users.