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원정윤 ( Won Jeong Yun ),장병욱 ( Chang Pyoung Wuck ),우철웅 ( Woo Chull Woong ),윤상묵 ( Yun Sang Muk ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.2
134 Dutch cone (mechanical cone) and 9 piezocone (electronic cone) penetration tests have been performed in the southwestern part of Korea. In general, Dutch cone results may be different from that of piezocone due to the difference in structure of the cones. 6 Dutch cone and piezocone test data which were obtained at the same point respectively, were analyzed and plotted in soil classification chart proposed by Robertson et. al.(1986, 1990). Cone factors of Dutch cone and piezocone test empirically have been determined using laboratory and field vane test results. Using this cone factors, it was shown that there was good correlation between shear strength estimated using cone resistance and that of laboratory test and field vane tests. It was found that there was a good correlation between cone resistance from Dutch cone and that from piezocone. Relationship formula was also suggested. Dutch cone test provides a useful means for stratigraphic profiling in large project and has some advantage over piezocone in particular situations, such as very soft clay ground and dredged area.
Fall cone과 수화열을 이용한 흙-시멘트 혼합물의 상 변화 연구
김재형,원정윤,김성필,장병욱,Kim Jae-Hyung,Won Jeong-Yun,Kim Sung-Pil,Chang Pyoung-Wuck 한국지반공학회 2004 한국지반공학회논문집 Vol.20 No.9
고함수비 상태의 흙에 시멘트를 첨가하게 되면 흙의 공학적 성질을 개량할 수 있다. 이렇게 고함수비 흙에 시멘트를 혼합하는 경우 흙시멘트 혼합물의 워커빌러티와 밀접한 관련이 있는 상 변화를 예측하고 구분하는 것은 매우 힘들다. 시간에 따른 시멘트 paste의 수화열 변화와 경도의 변화는 흙시멘트 혼합물의 상 변화에 대한 유용한 정보를 제공해준다. 본 연구에서는 시멘트 paste와 흙/시멘트 비를 달리 한 3 종류의 혼합물에 대해 수화열과 콘 관입량을 측정하여 흙시멘트 혼합물의 상 변화를 관찰하였다. 실험결과, 흙시멘트 혼합물의 상 변화는 시멘트 paste와 동일한 형태를 보이며 수화열이 최소가 되는 시점에서 혼합물의 전단강도가 급격하게 증가함을 알 수 있었다. 흙시멘트 혼합물의 초결시점은 fall cone 관입량이 1.0mm, 즉 혼합물이 소성상태에 도달하는 시점과 일치하며 흙/시멘트 비가 증가할수록 초결시간은 지연되었다. 흙시멘트 혼합물에 대한 수화열 측정과 fall cone 관입량 측정은 흙-시멘트 혼합물의 상 변화를 예측하는 유용한 수단으로 사용할 수 있다. Some amount of cements can be added into the soil with high water content to improve the engineering properties. In such a case, it is difficult to predict and figure out the phase changes of the soil-cement mixture which is closely associated with workability of the soil-cement mixture. Changes in heat of hydration and hardness of the cement pastes are known to provide the useful information about the phase changes of the soil-cement mixtures. In this study, heat of hydration and cone penetration depth were measured from the specimens of cement paste and 3 soil-cement mixtures. From the experimental results, it was found that the phase changes of the soil-cement mixtures are the same as those of cement paste, and that shear strength of the mixtures abruptly increases when the heat of hydration is minimum. Initial setting time of the mixtures coincides with the state when fall cone penetration depth was 1.0 mm and it is defined as plastic limit of the mixtures. Initial setting time of the mixtures is retarded as soil/cement ratio is increased. Measurements of heat of hydration and fall cone apparatus could be the useful tools to predict the phase changes of tile soil-cement mixtures.
방조제 바닥사석층의 규모가 제체 침투문제에 미치는 영향에 대한 모의 분석
이행우,장병욱,송창섭,원정윤,Lee Haeng Woo,Chang Pyoung Wuck,Song Chang Seob,Won Jeong Yun 한국농공학회 2006 한국농공학회논문집 Vol.48 No.1
Numerical analyses were carried out for studying on seepage problems due to seawater intrusion through the embedded rock layers of the sea-dike. A seepage analysis model, SAMTLE was developed fur two-layer embankment system. The analyses by SAMTLE showed that the size of embedded rock layer had a significant effect on the seepage problems of sea-dike. If the embedded rock layer is longer and thicker, the seepage problems become more serious to water head, seepage rate and safety factor of piping in embankment. On the other hand, if the width of embedded rock layer is equivalent to the sea-dike's bottom width, the water head becomes lower and seepage rate and safety factor of piping are dramatically increasing. This makes another seepage problems such that the fresh water becomes saltier and higher seepage rates result in internal erosion of sea-dike.
장병욱 ( Chang Pyoung Wuck ),차경섭 ( Cha Kyung Seob ),원정윤 ( Won Jeong Yun ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
This study performed to establish tile characteristics of constant rate of strain consolidation(CRSC) tests. The values obtained by the CRCS tests were compared with oedometer tests. From the comparision of the results of oedometer and CRSC tests for soft soil from Haenam, Korea, it was concluded that. 1. When rate of strain is 0.9mm/hr, compression curve of CRSC test was not coincided with those of tile oedometer test, then preconsolidation stress was larger than those of other rates of strain. 2. Permeabilities from CRSC tests and direct measurements were about same each other, but permeabilities from Oedometer tests were large than those from others.
차경섭 ( Cha Kyung Seob ),장병욱 ( Chang Pyoung Wuck ),원정윤 ( Won Jeong Yun ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.3
Most soft ground in the southern and western coasts in Korea consists of very compressible alluvial deposits. Four samples in these alluvial deposits were selected to manifest the constitutive relations of consolidation. A series of tests were performed to investigate void ratio - effective stress relation and void ratio - coefficient of permeability relation on soil samples obtained at Haenam, Jindo, Mankyung, and Janghung. permeabilities by CRS thoery were similar to directly measured data. but those of indirectly computed by C<sub>U</sub> shows difference. Several models about compressibility and permeability were compared with test data.
Fuzzy C-means 클러스터링 기법을 이용한 콘 관입 데이터의 해석
우철웅 ( Woo Chull Woong ),장병욱 ( Chang Pyoung Wuck ),원정윤 ( Won Jeong Yun ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.3
Methods of fuzzy C-means have been used to characterize geotechnical information from static cone penetration data. As contrary with traditional classification methods such as Robertson classification chart, the FCM expresses classes not conclusiveness but fuzzy. The results show that the FCM is useful to characterize ground information that can not be easily found by using normal classification chart. But optimal number of classes may not be easily defined. So, the optimal number of classes should be determined considering not only technical measures but engineering aspects.
경기도내 농업용 저수지의 제체 및 구조물의 노후도 조사 연구
장병욱 ( Chang Pyoung Wuck ),송창섭 ( Song Chang Seob ),박영곤 ( Park Young Kon ),우철웅 ( Woo Chull Woong ),원정윤 ( Won Jeong Yun ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.4
Field inspections and laboratory tests for 31 agricultural reservoirs in Kyungki province were performed to provide basic data for maintenance and rehabilitation of agricultural reservoirs and to evaluate structural degradation of agricultural reservoirs. Results of the study are as follows: 1) From survey's results of embankments, signs of settlement and lateral movement are appeared in 17 reservoirs. Crest settlement of 20~80cm, downstream settlement of 10~90cm, and 20~160cm lateral movement of embankments are detected from settlement and movement analysis of 17 reservoirs. Crest and downstream settlements and lateral movement are greatly occurred in 20~40 years after embankment construction. 2) About 39% of total reservoirs shows seepage problems occurred in the lower part of berm and retaining wall located between embankment and spillway. Probability of seepage problems is higher at retaining wall than others. 3) Concrete strength estimated by Schmidt hammer in structures of reservoirs is a range of 100~150kgf/cm<sup>2</sup> and average deviation of concrete strength is about 10kgf/cm<sup>2</sup>· Strength difference(□S) between compressive strength estimated b:y Schmidt hammer and uniaxial compressive strength of concrete core is about ±100kgf/cm<sup>2</sup>· This difference is due to absence or presence of reinforced bar in concrete core, variable length of concrete core and limitation of Schmidt hammer. 4) About 68% of total reservoirs shows leaching, 58% alkali-aggregate reaction and 71% abrasion/frost. Leaching, alkali-aggregate reaction and abrasion/frost occurred in most reservoirs when passed 10 years after construction of structure parts.