흙댐의 밀도변화에 의한 압밀침하에 대한 연구

윤충섭 한국농공학회 1986 한국농공학회논문집 Vol.28 No.3

This study was carried out for the settlement and camber of earth dam by the changes of the density. The testing material was taken five kinds of Soil used as banking material and it was compacted by 100, 95, 90, 85 and 80% compaction degree. The results of the settlement of earth dam whose height ranges from 10m to 50m are as follows. 1.The more the fine particle (n) increases, the higher the liquid limit (WL) and the lower the dry density (rd) becomes as follows; rd=2. 22-0. 0052n (gr/cm$_3$) rd=2. 394-0. 0164WL rd=2. 185-(5. 8n-2. 5WL)X10-$_3$ 2. The higher the optimum moisture content (Wo) becomes, the lower the density becomes as follows; rt,=2. 68-0. 028Wo rd=2. 578-0. 04Wo 3. 3.Most of the consolidation occurs immediately by loading and the more the fine particle increases, the lower the coefficient of consolidation becomes. 4.The more the fine particle increases and lower the compaction degree (D) becomes,the lower the pre-consolidation load (Pc) becomes but on the contrary the compression index (Cc) becomes higher. Those equation is as follows. Pc=3. 32-(4. 3n-3. 0D) X10-2 (kg/cm$^2$) Cc=0. 41+(1. 33n-4. 44D) X10-$^3$ 5.The more the consolidation load (P) increases, the lower the coefficient of volume change (mv) becomes with mv=ap-b, the higher the consolidation ratio (u) becomes with U= (0. 6~1. 35)PO.4 6.The more the fine particle (n) increases, the more the settlement of dam occurs with U=anb and 60-80% of the settlement occurs under construction. 7.The camber of dam has higher value in condition that has more fine particle, poorer compaction and higher height of dam. In the dam construction about twice value of table 7 is required for dam safety.

조립재가 흙의 역학적 성질에 미치는 영향

윤충섭,김호일 한국농공학회 1989 한국농공학회논문집 Vol.31 No.3

The study was carried out for the strength parameter of coarse grained Soil and slope stability analysis of earth dam. The test samples were taken fifteen kinds of soil from cohesive soil to coarse gravel. The degree of compaction of test samples for shear test and permeability test was chosen 95 percentage of maximum dry density. The results of this study are as follows ; 1.The maximum dry density(Yd) of coarse grained soil increase in proportion to coarse particles(P) with the relation of Y d= 1.609+0.0043P. 2.The coefficients of permeability(k) decrease by the increase of fine particles(n) with the relation of k=0.0426e-0 185n. 3.The cohesions of soil decrease by the increase of coarse particles, but internal friction angles are more increased in same condition. 4.The internal friction angles(${\Phi}$) decrease in inverse proportion to void ratio(e) with the relation of ${\Phi}$ = 73.068 - 69.268e. 5.The strength parameters( Ct ${\Phi}$t) by triaxial compression test are clearly smaller than that (Cd, ${\Phi}$d) by direct shear test in fine grained soil, but the differences between both parameters are a little in coarse grained soil.The relations of both parameters are as follows; Ct = O.544Cd + 0.04 ${\Phi}$t= 1.282${\Phi}$d-2306 6.In cohesive soil, the strength parameters( Cl ${\Phi}$l) by large size shear test apparatus are similar to the strength parameters(Cs , ${\Phi}$s) by small size shear test appratus, but Cs and ${\Phi}$s values are larger than Cl and ${\Phi}$l values from 10 percentage to 20 percentage in coarse grained soil. 7.The fine grained soil is inappropriate to high dam more than 20 meters and it must be taken coarse grained soil with high internal friction angle for high dam.

都市 우물의 疫學的 調査硏究

尹忠燮 現代醫學社 1968 現代醫學 Vol.9 No.2

웨이브렛 변환을 이용한 전자빔 용접 진단

윤충섭 대한용접접합학회 2003 대한용접·접합학회지 Vol.21 No.6

Wavelet transform analysis results show a spectrum energy distribution of CWT along scale factors distinguish the partial, full and over penetration in a electron beam welding by analyzing the curve of spectrum energy at small scale, middle and large scale range, respectively. Two types of signals collected by Ion collector and x-ray sensors and analyzed. The acquired signals from sensors are very complicated since these signals are very closely related the dynamics of keyhole which interact the very high density energy with materials during welding. The results show the wavelet transform is more effective to diagnosis than Fourier Transform, further for the general welding defects which are not a periodic based, but a transient, non-stationary and time-varying phenomena.

농업토목구조물(農業土木構造物)과 토질문제(土質問題)

윤충섭 한국농공학회 1989 韓國農工學會誌 : 전원과 자원 Vol.31 No.2

콘크리트 構造物의 施工과 品質管理

윤충섭,Yun, Chung-Seop 한국농공학회 1991 韓國農工學會誌 : 전원과 자원 Vol.33 No.3

新都市의 아파트공사에서 발생한 不良 레미콘의 문제는 社會에 큰 충격을 주었으며 우리 技術者들에게는 좋은 교훈이 된 사건이었다. 이러한 不美스러운 일이 또 다시 발생해서는 안될것이며 이번일 意圖的으로 이루어진 것이라면 관련되는 사람들은 엄한 처벌을 받아야 할 것이다. 土木工事라하면 콘크리트와 흙을 主材料로하는 構造物이 大部分으로서 大形의 構造物이 붕괴될 경우에는 많은 人命被害와 財産上의 큰 損失을 가져오는 경우가 있으므로 設計에서 施工에 이르기까지 완벽을 기해야 함은 技術者들의 重要한 임무인 것이다. 施工을 土木의 꽃이라고 할때 이 꽃이 아름답게 피어서 좋은 열매를 맺도록 하는 것이 品質管理라 할 수 있으며 따라서 이러한 일은 質的으로 우수한 構造物을 만들기 위한 가장 중요한 과정이라 할 수 있다. 土木施工에서 品質管理의 目的은 1 構造物의 品質의 向上과 均一化 및 品質의 信賴性向上 2 不良構造物防止 및 工事費節減 3 不必要한 作業과 補修作業의 減少 4 構造物 施工上의 問題點과 改善方向의 發見등을 들 수 있다. 施工現場에서 品質管理를 통해 구조물의 質을 높이기 위해서는 品質管理에 대한 전문적인 지식외에 다음의 몇가지 事項에 대한 올바른 認識이 필요하다.

농업토목구조물과 토질문제

윤충섭 한국농공학회 1989 한국농공학회논문집 Vol.31 No.2

레이저 용접에서의 용접선 추적 장치

윤충섭,양상민,박희창,한유희 대한용접접합학회 1994 대한용접·접합학회지 Vol.12 No.2

고속 연속용접시 필연적으로 발생하는 용접선의 오차를 감소하는 방법으로 용접선 추적을 하게 되는데, 본 연구에서는 근래에 상용화된 전자기식 방식과 레이저 시각 방식을 이용하여 용접시 발생할 수 있는 용접선의 형태에 대하여 용접선 추적을 실험하였다. 이 시험을 통하여 각각의 방식에는 고유의 특성을 가지고 있음을 알았다. 효율적인 용접 자동화 시스템을 구성하기 위하여, 용접하고자 하는 대상물 및 시스템에 대하여 적절한 센서의 선택이 선행되어져야 할 것이다. 본 연구실은 수행중인 레이저 용접 자동화 시스템 구성을 할 예정이다. 끝으로 위와 같은 용접선 추적장치는 전량을 수입에 의존하고 있는 실정이다. 보편적인 센서 시스템의 개발보다는 구축 하고자 하는 시스템에 알맞는 센서의 개발이 선행되어야 할 것으로 생각된다.

흙댐의 다짐밀도가 안정도에 미치는 영향에 관한 연구

윤충섭,김시원 한국농공학회 1989 한국농공학회논문집 Vol.31 No.1

This study was carried out for the stability analysis of earth dam by the variation of compaction density. The test samples were taken from five kinds of soil used for banking material and the degree of compaction for this samples were chosen 100, 95, 90, 85, and 80 percent. The stability problems were analysed by the settlement and camber( extra banking) of dam, strength parameter and dam slope, and coefficient of permeability and seapage flow through dam body. The results of the stability analysis of earth dam are as follows. 1. The more the fine particle increases and lower the compaction degree becomes, the lower the preconsolidation load becomes but the compression index becomes higher. 2. Sixty to eighty percent of settlement of dam occurs during the construction period and the settlement ratio after completion of dam is inversly proportional to the degree of compaction. 3. The camber of dam has heigher value in condition that it has more fine particle(N) and heigher dam height(H) with the relation of H= e(aN-bH-e). 4. The cohesion(C) decreases in proportion to compaction degree(D) and fine particle(N) with the relation of C= aD+ bN-c, but the internal friction angle is almost constant regardless of change of degree of compaction. 5. In fine soil, strength parameter from triaxial compression test is smaller than that from direct shear test but, they are almost same in coarse soil regardless of the test method. 6. The safety factor of the dam slope generally decreases in proportion to cohesion and degree of compaction but, in case of coarse soil, it is less related to the degree of compaction and is mainly afected by internal friction angle. 7. Soil permeability(K) decreases by the increases of the degree of compaction and fine particle with relation of K=e(a-bl)-cN) 8. The more compaction thickness is, the less vertical permeability (Kv) is but the more h6rzontal permeability (KH) is, and ratio of Kv versus KH is largest in range from 85 to 90 percent of degree of corn paction. 9. With the compaction more than 85 percent and coefficient of permeability less than ${\alpha}$X 10-$^3$cm/sec, the earth dam is generally safe from the piping action.

배수시공을 위한 국제관개배수위원회(ICID)기준 -110(지하수배시공)-

윤충섭 한국농공학회 1982 한국농공학회논문집 Vol.24 No.4