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모래지반 내의 터널 굴착시 볼트의 최적 설치위치 및 설치길이에 관한 실험적 연구
임종철,박이근,고호성 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
NATM의 보조공법인 락볼트공법은 토사지반에서는 반드시 행해져야 하는 필수적인 보조공법임에도 불구하고 설치위치 및 설치길이에 대한 연구가 별로 없고, 대부분 경험에 의거하여 시공을 행하고 있는 실정이다. 본 연구에서는 실내모형실험을 통하여 사질지반에 있어서 볼트의 적정한 설치위치 및 경제성 있는 볼트의 설치길이를 연구하였다. 실험결과, 터널 굴착단면의 하부지반에 볼트를 보강한 경우가 상부지반에 보강한 경우보다 더욱 효과적이었으며, 사질지반에서의 볼트의 경제적인 길이는 l/D의 값이 0.5임을 밝혔다. For all that rock-bolt method which is an additional method of NATM is necessarily needed to be constructed in soft ground, the propery installation position and an economic bolt length are not studied from now. The result of experiences is applied to most constructions of tunnel. The purpose of this study is to propose the proper position and economic length of bolt by model test at labotary. As the results of this model test, it was known that the lower part of tunnel is better than the upper part of tunnel in the position of bolt instaltion, and that an economic length of bolt is l/D=0.5.
[논문]다짐풍화토의 평면변형률 및 삼축압축시험의 강도정수에 관한 연구
고호성,임종철 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-
본 연구에서는 다짐풍화토를 이용하여 축대칭 삼축시험과 평면변형률 압축시험을 행하였다. 전단저항각은 평면변형률 시험에서는 41.5°, 삼축압축시험에서는 38 .5°로 평면변형률압축시험의 경우가 삼축압축시험보다 3°정도 크게 나타났다. 동일한 시료를 사용한 불교란시료의 전단저항각은 다짐시료보다 6°정도 크게 나왔다. 응력경로가 일정한 상태로 접근하므로 수정 Cam-Clay 이론의 적용이 가능한 것으로 판단된다.
임종철,홍석우,고호성 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.56 No.-
앵커는 흙막이 벽, 사면안정 등에서 사용되는 지반변형 억제공법이다. 앵커가 지중에서 인발하중을 받으면 앵커체의 강성과 지반의 강성에 따라 각각 다른거동을 하게 된다. 본 논문에서는 인장형 및 압축형 앵커의 인발에 따른 표면에서의 응력거동을, 주로 탄성계수비에 따른 전단응력의 변화에 중점을 두고 수치해석 기법을 이용하여 분석하였다. 여기서, 탄성계수비(codfficient ratio of elasticity)란 지반탄성계수(Er)와 앵커체탄성계수(Ea)의 비(Ea/Er)를 말하는데, 이 탄성계수비에 의해 앵커의 진행성 파괴에 대한 영향을 평가할 수 있다. Anchor is used for a restraining of a ground deformation in the retaining wall, slope-stability et ctc. Whe n pullout load is applied to the anchor in the ground, the behavior of the anchor in the ground is differed by the rigdity of anchor body and ground. In this study, the stress-behavior is analyzed by the numerical a nalysis on the suface of an anchor body according to the pullout of an anchor. Mostly, The analysis is foc used on the change of a shear stress according to the coefficient ratio of elasticity. The coefficient ratio of elasticity(Ea/Er) si defined by the ratio between elastic modulus of ground(Er) and that of anchor body (Ea). By using this ratio, the progressive failure of anchor body can be analysed.
高豪晟 제주대학교 1991 논문집 Vol.32 No.1
Since the Government prohibited the collective bargaining on some so-called management issues, the problem of statutory regulations on the subjects of collective bargaining has been debated fiercely in Korea. This problem has to be solved from the perspect of below. First, the statutory regulations on the subjects of collective bargaining in Korea basically rely on the distinction of the mandatory subjects, permissive subjects and illegal subjects. This distinction is drawn with reference to the judge-made law on this problem in the United States. Second, the practical conclusions on this distinction in Korea are very different from those in the United States. In the United States, only about the madatory subjects is the refusal to bargain treated as illegal and the strike, as legal. In Korea, it is the same as in United States that only about the mandatory subjects the refusal to bargain should be treated as illegal, but it is different from in the United states that about the permissive subjects the strike should be treated as legal in principle. Third, in Korea the permissive subjects are so general and inclusive to be defined as the subjects other than the illegal subjects. From this perspective is crucial the problem of what the illegal subjects are. But the illegal subjects of collective bargaing in Korea shoud be regarded to be rare in practice with respect to the peacefull character of collective bargains. Of course, there are some management issues that seems to be illegal subjects of strike. But there are no management issues that are illegal subjects of collective bargaing. Fourth, the mandatory subjects of collective bargaining in Korea about which the refusal to bargain should be treated as illegal and the strike, as legal, fall into two groups:those which deal with the relationship between the employer and the employees and those which deal with the relationship between the employer and the union.