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손성곤(Sung-Gon Son),유진오(Jin-O You),김진형(Jin-Hyoung Kim),이인규(In-Gyu Lee),손영호(Young-Ho Son) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
터널 현장에서 주요 지보재로 사용되는 록볼트는 터널내 원지반에 정착시켜 지반의 변형에 저항하고 이완 암괴의 붕락을 억제시키는 역할을 하며, 발파에 의한 지반거동에 대처하기 위해 조기 성능 발휘가 요구된다. 국내 시방기준을 참고하면 지반특성 및 현장시공여건에 따라 다양한 종류(재질, 정착방법 등)의 록볼트를 사용하도록 규정되어 있으나, 여러 제약조건으로 대부분 기존방식을 답습하는 형태로 설계와 시공이 이루어지고 있다. 터널에서의 작업조건은 주변환경, 지반상태, 지하수 유출 유무와 이에 따른 작업 Cycle 등에 따라 달라지며, 특히 용출수 구간은 일반구간에 비해 절리가 많고 암반붕락 가능성이 높아 록볼트 시공시 보다 세심한 주의가 필요하다. In tunneling, rockbolt, shotcrete and steel rib have been widely used to ensure the stability of the tunnel structures and to prevent falling of crushed rock during tunneling. In general, the rockbolt is mainly used with reinforced steel. However, steel bar or the materials with the same strength can be used depending on the rock conditions, ground water outflow condition, and the surrounding of applying location. In Korea, most tunnel construction sites have used cement mortar or resin for steel reinforcement on the rock. Due to the ground water outflow in the construction site, the usability of steel reinforcement is poor and it requires curing time especially after installing.
다양한 현장조건에서 튜브형 강관 록볼트의 시공사례 연구
손성곤(Sung-Gon Son),유진오(Jin-O You),김진형(Jin-Hyoung Kim),이인규(In-Gyu Lee),정재민(Jae-Min Chung) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
In tunneling, rockbolt, shotcrete and steel rib have been widely used to ensure the stability of the tunnel structures and to prevent falling of crushed rock during tunneling. In general, the rockbolt is mainly used with reinforced steel. However, steel bar or the materials with the same strength can be used depending on the rock conditions, ground water outflow condition, and the surrounding of applying location. In Korea, most tunnel construction sites have used cement mortar or resin for steel reinforcement on the rock. Due to the ground water outflow in the construction site, the usability of steel reinforcement is poor and it requires curing time especially after installing. A tube type steel rockbolt has been developed to reduce the cost and increase its applicability at harsh construction conditions. In this study, introduces the development of a tube type steel rockbolt, as well as presents the field testing and performance results.
손성곤(Sung-Gon Son),유진오(Jin-O You),유정훈(Joung-Hoon You),정재민(Jae-Min Chung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
A rockbolt is one of the most important reinforcement of on-site soil as with the shotcrete and steel rib. The rockbolt by setting within the tunnel can prevent the deformation of the ground profile; furthermore it improves the structural behavior of soil and rock. In general the rockbolt is mainly used with reinforced steel. However steel pipe or the materials with the same strength can be used depending on the soil conditions ground water outflow condition and the surrounding of applying location. In Korea most tunnel construction sites have used cement mortar or resin for steel reinforcement on the rock. Due to the ground water outflow in the construction site the usability of steel reinforcement is poor and it requires curing time especially after installation. To improve exist above problems this study introduces the development of a swelled steel pipe rockbolt as well as presents the field testing and performance results.
아산호 습지에서 관속식물의 군집 구조와 생산성 및 영양염류의 흡수
김철수,손성곤,이정환,오경환,Kim, Cheol-Soo,Son, Sung-Gon,Lee, Jeong-Hwan,Oh, Kyung-Hwan 한국생태학회 2000 Journal of Ecology and Environment Vol.23 No.3
The flora, distribution area, vegetation structure, annual net primary production, and nutrient uptake of the vascular hydrophytes, hygrophytes and mesophytes were investigated in the wetlands of the Asan-Lake, Chungchongnam-do and Kyonggi-do, Korea from March to October in 1997 to reveal the correlation between the plant community and the lake environment. The flora was composed of 38 families, 89 genera, 106 species, 14 varieties or total 120 kinds of the vascular plants. The life from of the hydrophytes were classified as 14 kinds of emergent plants, 5 kinds of submerged plants, and 4 kinds of free-floating plants, respectively. The number of species was various to 4 ∼85 kinds in each site. The dominant species was Zizania latifolia, and the importance values of Zizania latifolia, Typha orientalis, Phragmites communis, and Spirodela polyrhiza were 39.58, 14.90, 13.97, and 7.64, respectively. The distribution area of the emergent hydrophytes, hygrophytes, and mesophytes was 49.3 ㏊ (90.5%), and free-floating plants was 5.2 ㏊ (9.5%), whereas the floating-leaved and submersed plants were rare. Annual net production of the emergent hydrophytes, hygrophytes, and mesophytes was 547.9 ton D.W./yr (98%), and those of the free-floating plants was 10.5 ton D.W./yr (2%), and 558.4 ton D.W./yr in the whole lake ecosystem. The total uptake of nitrogen and phosphorus by the vascular plants was 7,099 and 1,891 ㎏/yr in the whole lake ecosystem. 아산호 연안대의 습지에서 식물군락과 호소 환경과의 상호 관계를 규명하기 위하여 1997년 3월부터 1997년 10월까지 수생식물, 습생식물 및 중생식물의 종조성, 분포 면적, 식생 구조, 현존량, 식물체에 의한 영양염류 흡수 등을 조사하였다. 관속식물은 38과 89속 106종 14변종으로 총 120종류가 분포하였는데, 그 중 수생식물은 정수식물 14종류, 침수식물 5종류, 부수식물 4종류 등 23종류가 출현하였고, 습생식물 및 중생식물은 97종류였다. 조사 지소별 분포 종수는 4∼85종류로 조사지소별로 차이가 많았다. 우점종은 줄(Zizania latifolia)이었으며, 부들(Typha orientalis), 갈대(Phragmites communis), 개구리밥(Spirodela polyrhiza) 등의 순으로 중요치가 낮아졌다. 정수식물, 습생식물 및 중생식물의 분포 면적은 49.3 ㏊(90.5%)이고 부수식물이 5.2 ㏊(9.5%)이며, 부엽식물 및 침수식물은 분포 면적이 매우 적었다. 생활형별 연순생산량은 정수식물, 습생식물 및 중생식물이 547.9 ton D.W./yr, 그리고 부수식물이 10.5 ton D.W./yr로서 이들의 비율은 98: 2이며, 호소 전체의 연순생산량은 558.4 ton D.W./yr에 달한다. 아산호 전체에서 관속식물에 의한 질소 및 인의 연간 흡수량은 각각 7,099kg 및1,891 kg이었다.