Journal of Korean Society for Rock Mechanics最新文献_第2页

A Design and Operation of EPBM Applied in Fort Canning Boulder Bed of Singapore 新加坡坎宁堡卵石床EPBM的设计与运行

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.417

U. Kim, Seung-hwan Noh, S. Noh

{"title":"A Design and Operation of EPBM Applied in Fort Canning Boulder Bed of Singapore","authors":"U. Kim, Seung-hwan Noh, S. Noh","doi":"10.7474/TUS.2015.25.5.417","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.5.417","url":null,"abstract":"Abstract This paper introduces the design and operational considerations for TBM tunneling in boulder bed which poses significant problems in terms of advance rate and machine wear. Managing these problems is difficult since normal soil investigation techniques do not accurately predict the presence and frequency of boulders. This has leads to considerable extra costs and delays during construction. In this paper, EPBM design and operational parameters, cutter wear characteristics and soil conditioning method in soft ground condition were studied and key successes were highlighted for future projects in similar ground condition. Key words Tunneling in boulder bed, EPBM design, Cutter wear, Soil conditioning초 록 본 논문은 TBM을 이용한 터널 굴착에서 커터의 마모 및 파손 , 그에 따른 굴착속도 저하와 커터교체에 따른 공기 지연 등으로 인하여 프로젝트 전반에 심각한 영향을 미치는 전석층 지반 터널링에 관한 내용으로 , 매우 조밀하고 단단한 상태의 점토지반에 강한 강도를 지니는 암석을 포함하는 싱가포르 포트캐닝 볼더베드 (Fort Canning Boulder Bed, FCBB)에서의 터널링 경험을 바탕으로 볼더층을 통과하게 되는 토압식 쉴드 TBM의 설계 및 시공 시 고려해야 할 주요 사항 및 볼더지반에서의 커터 마모 및 파손 특성 , 점토 및 암석이 혼재된 지반에서의 쏘일 컨디셔닝 등의 내용을 기술하였으며, 향후 유사 지반에서의 터널링 프로젝트에 참고가 되길 기대한다 . 핵심어 볼더지반 터널링, 토압식 쉴드TBM 설계, 커터 마모, 쏘일 컨디셔닝","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124311758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Characteristics of Block Hydraulic Conductivity of 2-D DFN System According to Block Size and Fracture Geometry 基于块体尺寸和裂缝几何形状的二维DFN系统块体导流特性

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.450

Jisu Han, J. Um

{"title":"Characteristics of Block Hydraulic Conductivity of 2-D DFN System According to Block Size and Fracture Geometry","authors":"Jisu Han, J. Um","doi":"10.7474/TUS.2015.25.5.450","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.5.450","url":null,"abstract":"Abstract Extensive numerical experiments have been carried out to investigate effect of block size and fracture geometry on hydraulic characteristics of fractured rock masses based on connected pipe flow in DFN systems. Using two fracture sets, a total of 72 2-D fracture configurations were generated with different combinations of fracture size distribution and deterministic fracture density. The directional block conductivity including the theoretical block conductivity, principal conductivity tensor and average block conductivity for each generated fracture network system were calculated using the 2-D equivalent pipe network method. There exist significant effects of block size, orientation, density and size of fractures in a fractured rock mass on its hydraulic behavior. We have been further verified that it is more difficult to reach the REV size for the fluid flow network with decreasing intersection angle of two fracture sets, fracture plane density and fracture size distribution.Key words Fractured rock mass, Discrete fracture network, Block hydraulic conductivity, Representative elementary volume초 록 본 연구는 블록크기 및 균열의 기하학적 속성이 균열암반의 수리적 특성에 미치는 효과를 파악하기 위해 이차원 등가파이프 연결구조에 기반을 둔 DFN 유체유동 해석기법을 적용하여 수치실험을 수행하였다 . 두 개의 균열군을 사용하여 균열의 기하학적 속성 변화를 반영할 수 있도록 방향 , 면적빈도, 길이분포를 달리하며 이차원 영역에 추계론적으로 생성한 총 72개의 DFN 블록에 대하여 방향에 따른 블록수리전도도가 산정되었다. 또한, 각각의 DFN 블록에서 이론적 블록수리전도도 , 주 수리전도도텐서 및 평균블록수리전도도를 추정하여 비교분석한 결과, 블록크기 및 균열의 기하학적 속성은 균열성 암반의 수리적 특성에 큰 영향을 미치는 것으로 평가되었다. 균열군의 교차각이 작을수록 , 면적빈도가 낮고 길이분포가 짧을수록 DFN 시스템은 유체유동에 대한 REV를 정의하기 어려우며 방향에 따른 블록수리전도도의 변동성이 강하게 나타났다 . 일반적으로 블록크기가 커질수록 DFN 시스템에 대한 등가연속체 취급 가능성은 높아진다 .핵심어 절리암반, 불연속균열망, 블록수리전도도, 대표요소체적","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134051704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Topographic Survey at Small-scale Open-pit Mines using a Popular Rotary-wing Unmanned Aerial Vehicle (Drone) 基于旋翼无人机的小型露天矿地形测量

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.462

Sungjae Lee, Yosoon Choi

引用次数: 42

A Numerical Study on the Reinforcement Method of a Pillar Using Tension Bolts at the Connecting Part between 2-Arch Tunnels and Parallel Tunnels 双拱隧道与平行隧道连接处锚杆张拉加固方法的数值研究

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.470

Yeonjun Park, Jaeyoun Choi

{"title":"A Numerical Study on the Reinforcement Method of a Pillar Using Tension Bolts at the Connecting Part between 2-Arch Tunnels and Parallel Tunnels","authors":"Yeonjun Park, Jaeyoun Choi","doi":"10.7474/TUS.2015.25.5.470","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.5.470","url":null,"abstract":"Abstract Two-arch tunnels require minimal spacing between the 2 tunnels and thus occupy small amount of land compared to parallel tunnels. But it is rather expensive. The parallel tunnel is not as expensive, but it requires more land than 2-arch tunnels. This may cause a problem when there is a land shortage. The new design is to connect these two types of tunnels by another pair of parallel tunnels where the separation distance is gradually increasing. The applicability of this new design to the cases where rock condition is not even fair has to be verified since the width of the pillar between the connecting tunnels can be quite narrow. Therefore both two and three dimensional numerical analyses were conducted and pillar stability was examined for rock classes IV and V in two different ways. Results showed that this new design is still effective for poor rock conditions if central pillar is properly reinforced by tension bolts as long as overburden is less than five times of the tunnel diameter.Key words 2-arch tunnel, Parallel tunnel, Pillar 2-arch varying section tunnel, Tension bolt초 록 2-아치 터널은 터널의 간격이 매우 좁아서 병렬 터널에 비해 점유 면적이 작으나 경제적이지 못하다 . 병렬 터널은 경제적이긴 하지만 2-아치 터널보다 점유 면적이 커서 용지의 매입이 어려운 경우에는 문제가 될 수 있다. 새로운 설계는 이 두 터널을 터널의 간격이 점차 증가하는 제 3의 병렬터널로 연결시키는 것이다. 접속 터널의 필라는 폭이 매우 좁을 수 있기 때문에 이 새로운 설계를 불량한 암반에 적용하려면 검증이 필요하다 . 이에 4등급 및 5등급 암반에 대해 2차원 및 3차원 수치해석을 이용하여 2가지 방법으로 안정성 검토를 수행하였다. 검토 결과, 중앙 필라가 텐션 볼트로 적절히 보강된다면 터널 심도가 직경의 5배 이하인 경우에는 적용이 가능하였다.핵심어 2-아치 터널, 병렬 터널, 2-arch 변단면 터널, 필라, 텐션 볼트","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"420 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116526760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Pillar Width on the Stability of Twin Tunnels Using Scaled Model Tests 矿柱宽度对双隧道稳定性影响的比例模型试验研究

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.423

Jong-Woo Kim

引用次数: 2

Variation of Physical and Microstructural Properties of Limestone caused by Artificial Freezing and Thawing 人工冻融对石灰石物理和微观结构特性的影响

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.435

Jihwan Park, Hyeong-Dong Park

{"title":"Variation of Physical and Microstructural Properties of Limestone caused by Artificial Freezing and Thawing","authors":"Jihwan Park, Hyeong-Dong Park","doi":"10.7474/TUS.2015.25.5.435","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.5.435","url":null,"abstract":"Abstract Physical and microstructural properties of Pungchon and Maggol limestone were investigated quantitatively during 50 cycles of artificial freezing and thawing test. There were decrease in dry weight and P,S-wave velocity, and increase in absorption rate in both rock types. Porosity, pore volume, equivalent diameter, throat thickness and pore orientation were analyzed using X-ray computed tomography images. Porosity increased, and initiation and expansion of pores were investigated as weathering progresses. Physical and microstructural variation in Maggol limestone was larger than that of Pungchon limestone because Maggol limestone has more pores and microcracks at initial state. As this study analyzes physical and microstructural properties of rock specimens comprehensively, it can be applied to further rock weathering study and can be used as fundamental data of construction and resource development in cold regions.Key words Freezing and thawing, Artificial weathering, X-ray computed tomography, Pore structure, Physical property초 록 풍촌석회암과 막골석회암을 대상으로 –18 ~ +32°C의 온도범위에서 총 50회의 인공적인 동결-융해 풍화 시험을 수행하고 그로 인한 물리적 성질과 미세구조의 변화를 정량적으로 분석하였다 . 두 가지 암종 모두 건조무게와 P,S파 속도는 지속적으로 감소하는 경향을 보였고 , 흡수율은 증가하는 경향을 보였다 . X선 단층촬영 영상 분석 결과 실험 후 공극률이 증가하였으며 , 공극부피, 등가직경, 국부두께, 방향성 등 여러 지표에서 공극의 생성 및 확장을 확인할 수 있었다 . 막골석회암의 물리적·미세구조적 변화가 풍촌석회암에 비해 크게 나타났는데 이는 초기 상태의 막골석회암이 더 많은 공극과 미세균열을 가지고 있었기 때문으로 추정된다 . 본 연구는 암석의 물리적 성질과 미세구조적 성질을 통합적으로 분석함으로써 향후 암석의 풍화 연구에 적용될 수 있을 뿐만 아니라, 저온지역의 건설, 자원개발 활동에 기초자료로써 이용될 것으로 기대된다 .핵심어 동결-융해, 인공풍화, X선 단층촬영, 공극구조, 물리적 성질","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117134869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Research and Development Trends for Mine Subsidence Prevention Technology in Korea 韩国矿山沉陷防治技术研究与发展趋势

Journal of Korean Society for Rock Mechanics Pub Date : 2015-10-31 DOI: 10.7474/TUS.2015.25.5.408

Soo-lo Kim, J. Park

{"title":"Research and Development Trends for Mine Subsidence Prevention Technology in Korea","authors":"Soo-lo Kim, J. Park","doi":"10.7474/TUS.2015.25.5.408","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.5.408","url":null,"abstract":"Abstract The collapse of the underground cavities and voids, which were made for developing mineral resources, can cause the subsidence of the ground surface in the residential areas. During the Japanese colonial era and the 1960’s mining boom period, lots of mines had been developed indiscriminately in Korea. Due to complicated geological conditions and mining methods, many of dangerous underground mine cavities with steep slopes had been generated at the shallow surface. Due to such conditions, it is difficult to directly apply valid foreign reclamation practice for the cavities in Korea environments. It is necessary to develop the efficient ground stabilization technologies for the Korea underground mine conditions to solve abandoned mine reclamation properly. Therefore, MIRECO and Korea government have been carrying out practical researches and technical developments together with other academic researchers and reclamation business partners, and various practical solutions such as surveying and exploration methods, proper cavity filling materials and reinforcement methods have been developed with application in the mine field. In this article, up to date technologies and R&D trends in the field of mine subsidence prevention technology are broadly reviewed to establish the future direction of a research and development.Key words Mine cavities & voids, Mine Subsidence prevention technology, R&D trends초 록 광물자원 채굴을 위한 지하 채굴공동의 붕괴는 인간이 생활하고 있는 지역의 지반침하 피해를 유발할 수 있다. 한국은 일제강점기 및 1960년대 광산 활황기에 수많은 광산이 무질서하게 개발되었다 . 복잡한 지질학적 여건 및 광산개발 방식으로 인하여 한국에서는 지표 천부에 급경사의 위험한 채굴적이 발생되었으며 , 이러한 여건으로 인하여 외국의 광해방지기술을 광산 채굴공동 현장에 그대로 기술을 적용하기 어렵다 . 이러한 문제점을 해결하기 위하여 한국의 지하 채굴적 및 공동에 효과적인 지반안정화 기술을 개발이 필요하다 . 한국 정부 및 한국광해관리공단은 대학 연구자 및 전문광해방지사업자 등 관련자들과 함께 지속적으로 실용화 연구개발을 수행해오고 있으며, 다양한 실용화 조사 및 탐사기술 , 공동 충전재료 및 보강방법이 개발되어 현장에 적용되고 있다. 본 보고에서는 향후 연구 및 기술개발 방향을 수립하기 위하여 과거와 현재의 지반침하분야 기술개발 동향을 검토하였다.핵심어 광산 채굴적 및 공동, 지반침하방지 기술, R&D 기술동향","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128304188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Keyword Analysis of Two SCI Journals on Rock Engineering by using Text Mining 基于文本挖掘的两种SCI岩石工程期刊关键词分析

Journal of Korean Society for Rock Mechanics Pub Date : 2015-08-31 DOI: 10.7474/TUS.2015.25.4.303

Y. Jung, E. Park

引用次数: 5

Sensitivity Analyses of Three-Dimensional Discrete Fracture Network Modeling of Rock Mass 岩体三维离散裂隙网络建模敏感性分析

Journal of Korean Society for Rock Mechanics Pub Date : 2015-08-31 DOI: 10.7474/TUS.2015.25.4.341

J. C. Park, Seung-Hun Park, Ha Yung Kim, Geon-Young Kim, Sangki Kwon

{"title":"Sensitivity Analyses of Three-Dimensional Discrete Fracture Network Modeling of Rock Mass","authors":"J. C. Park, Seung-Hun Park, Ha Yung Kim, Geon-Young Kim, Sangki Kwon","doi":"10.7474/TUS.2015.25.4.341","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.4.341","url":null,"abstract":"Abstract This study analyzes the relationship between parameters of the discontinuity in Discrete Fracture Network model such as fracture intensity, fracture orientation, fracture size, fracture shape etc. In this paper, FracMan code was used to model and analyze 3D DFN. A sensitivity analysis was performed in order to analyze the relationship between linear fracture intensity measure (   ) and parameters of the discontinuity in 100 m × 100 m × 100 m model area. As a result the sensitivity analysis showed that key parameters affecting fracture intensity are fracture orientation (Trend / Plunge). Conversion factor(   ) for   , to calculate volumetric fracture intensity measure (   ), is derived in case of vertical well and horizontal well when trend is 10°, 30°, 60°, 90°, 120°, 150°, 180° (7cases) and plunge is 5°, 15°, 30°, 45°, 60°, 75°, 85° (7cases). It is expected that this paper can be used effectively for modeling and understanding DFN model.Key words Discontinuous rock masses, 3D Discrete Fracture Network, Fracture intensity, FracMan code초 록 본 연구에서는 불연속암반의 모사기법인 3차원 불연속균열망(Discrete Fracture Network, DFN)모델의 구성 및 해석 코드인 FracMan을 이용하여, DFN모델에서의 불연속면의 밀도(fracture intensity), 불연속면의 방향성(fracture orientation), 불연속면의 크기(fracture size), 불연속면의 모양(fracture shape) 등의 불연속면의 특성인자간의 관계를 분석하고자 하였다. 100 m × 100 m × 100 m 모델영역에서 균열의 선형밀도(","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128294335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calculation of a Diesel Vehicle's Carbon Dioxide Emissions during Haulage Operations in an Underground Mine using GIS 基于GIS的地下矿山柴油车运输作业二氧化碳排放量计算

Journal of Korean Society for Rock Mechanics Pub Date : 2015-08-31 DOI: 10.7474/TUS.2015.25.4.373

Boyoung Park, Sebeom Park, Yosoon Choi, Han-Su Park

引用次数: 5