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      • KCI등재

        마사토의 차수성에 관한 실험적 연구

        이형수 한국수자원학회 1974 한국수자원학회논문집 Vol.7 No.2

        Fill Type Dam에 있어서 일반적으로 축조재료는 경제성을 감안하여 Dam Site 부근에서 구해야하므로 Core 용재료로서는 차수성의 문제만 해결된다면 마시토도 사용가능할 것이라는 전제하에 본문에서는 마사토를 단독 또는 혼합재료로서 각종시험을 실시하여 사용가능성 여부를 검토하고 기사용범위를 정함으로써 앞으로의 사용자들에게 편의를 제공코저 한다. On the constructions of fill type dams, usually the constructions materials is desired to be obtained in vicinity ofthe dam sitc to justify economical feasilblity of the project. In the stability analysis of the dams, core parts takesa small fraction of t

      • 慢性 消化性 胃潰瘍에 發生한 胃癌과 結核性 變化 : 1例報告 A Case Report

        李亨秀,姜大榮,李泰淑 충남대학교 의과대학 지역사회의학연구소 1975 충남의대잡지 Vol.2 No.1

        It is estimated for many investigators that carcinmaotous change arising in the chronic peptic ulcer of the stomach is less than 5% of incidence. Moreover, it is a very rare case that tuberculous lesion associated with those, chronic peptic ulcer and carcinomatous change in the stomach. We found, incidentally, those lessions in the subtotally gastrectomized specimen for surgical treatment of stomach cancer, and report this case with brief review on the literatures.

      • 花崗土의 다짐 및 剪斷特性에 關한 硏究

        李瀅洙 중앙대학교 기술과학연구소 1984 기술과학연구소 논문집 Vol.13 No.-

        Decomposed granite soil distributed throughout the peninsular is weathering residual soil which is made of the granite. The formation process of decomposed granite soil complicate, and it is differed from its engineering characteristics by the mineral productions of original rocks. The decomposed granite soil being situated on the course of weathering exists very unstable conditions in chemical and physical aspects, and it diminish greatly its intensity when it submerged into water. After finishing the compaction test, we bring the decomposed granite soil into the test, in order to analogize following conclusions. 1. The lubrication step of the decomposed granite soil that is showed in Hogentoglers theory is to be guessed about 85% of saturation ratio and possesses the maximum dry density when the compaction effect is greatly hiked with having nothing to do to saturation ratio. 2. The decomposed granite soil included much water content increase density of soil grain following the increase of Vertical stress, and resistance against the shearing stress increase because Vertical displacement is decreased with being crushability. 3. The density of decomposed granite soil is increased as compaction energy hike. The increasing ratio is not in direct proportion to the compaction energy, and hikes till a certain compaction energy, but it hardly increase after a certain compaction energy. It is suggested that the mainspring is crushability one of the characteristics of the decomposed granite soil. 4. As increasing the water content, internal friction angle (Ø) diminish gradually till optimum moisture content, but it drop greatly on the curve over the optimum moisture content. Following the experimental results of this study, it can be understood that shearing stress of the decomposed granite soil was influenced greatly by water content.

      • KCI우수등재

        포화사(飽和砂)의 전단강도(剪斷强度)에 관한 실험적(實驗的) 연구(硏究)

        이형수,박용대,Lee, Hyoung Soo,Park, Young Dae 대한토목학회 1989 대한토목학회논문집 Vol.9 No.3

        본(本) 연구(硏究)는 일본(日本)의 표준사(標準砂)인 풍포사(豊浦砂) (Toyoura Sand)를 사용(使用)하여 일본대학(日本大學) 이공학부토질실험실(理工學部土質實驗室)에 비치(備置)된 응력(應力)과 변형(變形)의 조건(條件)이 서로 다른 시험장치(試驗裝置) 이용(利用)하여 평면변형시험(平面變形試驗)과 축대칭응력(軸對稱應力) 조건하(條件下)의 삼축압축시험(三軸壓縮試驗)을 실시(實施)하고 이미 조사(調査) 보고(報告)한 바 있는 비트림 단순전단시험(單純剪斷試驗) 결과(結果)와 비교(比較)하여 3차원(三次元) 응력조건하(應力條件下)에서 포화(飽和)된 모래의 전단변형(剪斷變形) 특성(特性)을 검토(檢討)하여 다음과 같은 결론(結論)을 얻었다. 1) 모래의 내부마찰각(內部摩擦角) ${\phi}_d$는 응력변형(應力變形)의 조건(條件)에 관계(關係)없이 구속압(拘束壓)에 반비례(反比例)한다. 이는 같은 밀도(密度)의 모래라도 구속압(拘束壓)이 낮을 수록 체적변화(體積變化)가 크기 때문이다. 2) 같은 밀도(密度)의 모래라도 응력변형(應力變形)의 조건(條件)에 따라 ${\phi}$값이 다르며 ${\phi}_dTS$는 ${\phi}_dPS$ 및 ${\phi}_dTC$에 비(比)하여 구속압(拘束壓)이 낮을 때 그 영향이 크다. 3) 같은 밀도(密度)와 구속압하(拘束壓下)에서는 ${\phi}_dPS$는 ${\phi}_dTC$ 보다 크고 ${\phi}_dTS$ 보다 작은 값을 나타내는 것을 보아 모래의 전단강도(剪斷强度)는 응력변형(應力變形)의 조건(條件)에 따라 차이가 남을 알 수 있다. 4) 모래의 한계상태(限界狀態)를 나타내는 에너지 소산식(消散式)에 의(依)하면 응력비(應力比)(q/p)와 변형증분비(變形增分比) 관계(關係)는 평면변형시험(平面變形試驗)의 경우 공시체(供試體)의 구속압(拘束壓) 및 밀도(密度)에 관계(關係)없이 동일(同一)한 직선상(直線上)에 존재(存在)한다. The purpose of this study is to compare the results of shear-deformation of saturated sand under the 3 dimensional stress with the results of simple torque-shear test already reported, Japaness standard sand, Toyoura sand, was chosen as test sample and the equipments of the department of soil mechancis laboratory of Nihon University were used. The conclusions obtained are as follows. 1). The friction angle of sand (${\phi}$) is proportional to the density regardless of the condition of stress-strain. This is because of the reason that the lower the cell pressure becomes, the larger the volume changes in case of the same density. 2). The value of ${\varphi}$ are variable according to the condition of stress-strain in the same density, and ${\phi}_dTS$ is larger than ${\phi}_dPS$ and ${\phi}_dTC$ when cell pressure is low. 3). ${\phi}_dPS$ is larger then ${\phi}_dTS$, under the same denstiy and same cell pressure. Thus the shear strength of sand is decided according to the condition of stress-strain 4). the relationship between the stress ratio (q/p) and strain increment ration in the plane strain test is linear regardless of the density and the cell pressure of the test sample.

      • KCI등재

        마사토의 차수성에 관한 실험적 연구

        이형수 한국수자원학회 1974 한국수자원학회논문집 Vol.7 No.2

        Fill Type Dam에 있어서 일반적으로 축조재료는 경제성을 감안하여 Dam Site 부근에서 구해야하므로 Core 용재료로서는 차수성의 문제만 해결된다면 마시토도 사용가능할 것이라는 전제하에 본문에서는 마사토를 단독 또는 혼합재료로서 각종시험을 실시하여 사용가능성 여부를 검토하고 기사용범위를 정함으로써 앞으로의 사용자들에게 편의를 제공코저 한다. On the constructions of fill type dams, usually the constructions materials is desired to be obtained in vicinity ofthe dam sitc to justify economical feasilblity of the project. In the stability analysis of the dams, core parts takesa small fraction of the slip circle and main function of core is to decrease dam permeability. This paper shows results of various tests as physical properties, compactions (using single, double triple and four times of the tandard compaction energy) and the permeability tests. Single decomposed granite and mixed materials with clay soils were used in this test. And conclusions of these tests are as follows; 1. Criteira of weathering ratio should be caleulated by density measarment. 2. Permeability coefficient maiuly depends on th #200 sieve passing, and also passing soil quantities depends on the weathering condition of the soil. 3. It was established that low weathered decomposed granite can not be used for the core materials of the fill type dams. On the other hand, moderately weathered decomposed granite soil with particles could pass through #200 sieve in a quantity over 10%, could chieve permeability in a magnitude of $1{\times}10^{-5} cm/see$. 4. With the decomposed granite soil it is possible to perform three times larger compaction energy than the standard energy without any problems.

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