전문대학(專門大學)의 교육(敎育)과 산업계(産業界) 인식(認識)

유범식 한국농공학회 1990 韓國農工學會誌 : 전원과 자원 Vol.32 No.3

粘性土의 一軸壓縮 强度와 그의 實用性에 關한 硏究

劉範植 안성산업대학교 1982 論文集 Vol.14 No.-

一軸壓縮 强度의 測定値로서 粘土와 砂質土의 中間的 粒度組成인 粘性土의 實用的 壓縮强度를 求하기 위하여 粒度를 調整한 試料에 대하여 實施한 一軸壓縮 및 三軸壓縮 試驗 結果를 要約하면 다음과 같다. 1. 粒度組成이 砂質土에 가까운 飽和粘性土는 壓密 終了後 拘束壓의 除去에 따라서 飽和度 및 非排水 剪斷强度가 低下하며 非排水 剪斷强度의 低下比率은 砂質土에 가까울수록 顯著하였다. 2. 砂質土에 가까운 粘性土의 測定, 一軸壓縮 强度는 地盤속에서의 粘着力보다 작으며 拘束壓 除去에 따르는 減少分을 補正할 수 있다. 3. 補正係數는 粘土 含有量 및 塑性指數의 ??數로 取扱하는 것이 可能하다. 4. 粘土 含有量이 10%以下인 흙에 대하여는 適用할 수 없으며 粒度分析 試驗 또는 塑性指數에 대한 試驗을 愼重히 하여야 하겠다. A series of unconsolidated undrained triaxial compression and unconfined compression tests are preformed on soil samples for some range of particle grading by mixing clay portion and sand portion with various proportion, in order to investigate a practical treatment of undrained shear strength of soils of intermediate grading between clay and sand. The results are as follows : 1. As the clay fraction of saturated sample decrease, degree of saturation and unconfined compression strength becomes relatively smaller according to release of confining pressure after consolidation completion. 2. The nearer in sand, decreasing rate of unconfined strength is obvious. 3. Based on the test results, the measured value of unconfined compression strength of soils having intermediate grading between clay and sand can be corrected reduction for stress release in the in-situ soul sampling. 4. This correction requires the overburden stress in term of total stress and two kinds of correction factors, which are determined by the clay fraction and plasticity index. 5. Application of this correction is limited to the soils of clay fraction of more than 10%, and test of grading analysis will be operate circumspectly.

浸水된 다짐흙이 剪斷特性에 關한 硏究

劉範植 안성산업대학교 1984 論文集 Vol.16 No.-

The shear characteristics of soils change generally caused by soaking. The author have performed direct shear test in soaking and unsoaking samples on a silty sand and three clays prepared widely used for banking. The conclusions are summarized as follows: 1) The settlement appearance by soaking in loading is caused by disappearance of compressive force among the particles by capillary water, it is explained with Bishop's effective stress equation of partly saturation. 2) The lower of moisture content of sample, the sattlement showed a tendency to increase when silty sand and non compressive clay is soaked on loading. 3) The shear strength of soils is caused by decrease for lubrication of inter-particles with permeated water. Hense, this fact must be considerated for design of banking structures. 4) According to increment initial moisture in soaking and un-roaking samples, variation of soil structure to take influence of shear strength characteristics didn't appeared. 5) The higher of compressive soils, dilatancy index in soaking samples is lower than it of unsoaking.

動力耕耘機의 機種의 差異가 作業效率에 미치는 影響

劉範植 안성산업대학교 1976 論文集 Vol.7 No.-

動力耕耘機의 10 P.S와 6 P.S의 兩機種을 使用하여 耕耘, Rotary耕, 牽引能率 및 單位面積當 所要經費等에 對한 調査를한바 그 結果를 要約하면 다음과 같다. 1. 10 P.S 耕耘機에 比하여 6 P.S는 耕耘 및 Rotary耕이 狀態 떨어지지 않으면서 作業能率에 있어서는 큰差가 없었다. 2. 6 P.S에 比하여 10 P.S 耕耘機는 作業上 疲勞度가 甚하고 따라서 年少, 年老者 및 婦女子가 運用하기 困難하다. 3. 牽引作業에 있어서는 10 P.S가 6 P.S 耕耘機에 比하여 效率的이나 運轉上 큰 疲勞度를 주고 危險度가 더욱 크다. 4. 單位面積當 投下經費 및 耕耘機 運營費에 있어서 6 P.S가 10 P.S에 比하여 低廉하고 經濟的이다. The efficiencies in plowing, rotary plowing, and trans portation for the 2 kinds of power tiller-10 P.S. and 6 P.S. - were examined and expenses per unit area for the plowing and seeding preparation were surveyed. The following results were obtained. 1. Little difference in efficiency for the plowing and rotary plowing were recognized between 10 P.S. and 6 P.S. power tiller. 2. It was less tired for plowing with 6 P.S. than with 10 P.S. power tiller. 3. It was more efficient for transportation in 10 P.S. than in 6 P.S. power tiller, whereas 10 P.S. power tiller was followed less safety than 6 P.S. power tiller. 4. The less operationg expenses resulted from 6 P.S. power tiller than in 10 P.S. power tiller.

흙의 다짐과 物理的 性質에 關한 試驗

劉範植 안성산업대학교 1977 論文集 Vol.9 No.-

This study is to investigate the relationship of compaction and some physical properties in soil. Some results obtained in this study are summarized as follows. 1. Generally, the relationship between maximum dry density of the compacted soil and optimum moisture content. and liguid limit show negative correlation as _rdmax = a + bx (a > o, b < o ). 2. The relationship between optimum moisture content and liguid limit and plastic limit and between liguid limit and plastic limit can be repressented positively linear correlation as Wopt = a + bx (a > o, b > o ). 3. The fact that maximum dry density is decreased with increase of the optimum moisture content and liguid limit of any compacted soil, and fact that optimum moisture content is increased positively with liguid limit and plastic limit, lead to the conclusion that clay content is direct factors in reductuon of the maximum dry density.

다짐한 不飽和 粘性土의 剪斷 强度 特性에 관한 硏究

劉範植 안성산업대학교 1992 論文集 Vol.24 No.-

This study carried out to investigate characteristics of compacted unsaturated cohesive soils widely used for construction of fill dam, road, residential and industrual site. It is performed undrained unconsolidation compression test, isotropic triaxial compression test and average principal stress test in constant condition. Testing conditions are ; 1) dry density is constant, variable water content, 2) water content is constant, variable dry density. The results of study are as follows ; 1. The stress conditions in triaxial compression test are considered average principal stress component and purely shear component. 2. The shear stress of soil used in evaluated smaller about 20% in accordance with correction of volumetric strain by shear component. 3. Volumetric change in accordance with average principal stress increment are corrected by time effect only considered, exist doubt on a propriety. 4. The difficult problem in unsaturated soil on theory are remained today, therefore this results are useful for analysis of unsaturated soils behaviour.

세립분 함유율에 따른 투수특성에 관한 실험적 연구

유범식,조성민 안성산업대학교 1995 論文集 Vol.27 No.-

Permeability characteristics are varied with fine grained soil contents, because soil is composed of various grain size. A series of permeability test is performed with the specimens obtained by standard compaction test, and soil samples are obtained by mixing the standard sand with the fine grained soil(passing of #200 sieve) whose rate is from 5% to 50% respectively. The test results are follows. 1) Specmens with 25%-30% fine grained soil shows maximum density but the permeability is not proportional to the density. 2) The relation between dry density and void ratio is derived as following equation. <본문참고> Therefore it is known that here is close relation between dry density and void ratio. 3) The specimens up to 30% fine grained soil, permeability decreases proportional to straight line, but the specimens over 30% fine grained soil, the variation of permeability is almost neglegible. Where as the ralation between permeability and the fine grained soil content is as follows. 30% 〈 log K= -1.492-0.19x 30% 〉log K=-3.89-7.78×10^-2x-3.6×10^-5x^2 (x : fine grained soil cotent ratio) 4) Permeability diminishes on the increment of fine grained soils under the same void ratio on account of it varies with soil grains distribution and related to the size and shape of soil structure.

벽체의 뒷채움이 제한되어 있는 경우의 토압산정이론식

유범식,김훈제 안성산업대학교 1996 論文集 Vol.28 No.-

In case that the length of Backfill behind wall is confined, the active earth pressure acting wall will be reduced as compare with that calculated by conventional active earth pressure theories. Consequently, in this research , the theoritical formula of active earth pressure is proposed and conclusions are following. The angle of failure plane, 'α' of backfill soil is inclined to reduce as 'B/H' increase regardless of the angle of internal friction of backfill soil and earth pressure increase as the angle of internal friction reduce. The reduction effect of active earth pressure according to backfill length increase as 'B/H' more reduce than 'B/H=0.6'.

전문대학의 교육과 산업계 인식

유범식 한국농공학회 1990 한국농공학회논문집 Vol.32 No.3

韓國의 鐵道設置過程 : 鐵道創設期를 中心으로

兪範植 西江大學校 經商大學 1977 經商評論 Vol.- No.4