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농업용 저수지 제방에서 토목섬유 블랭킷의 길이에 따른 감압정의 성능 평가
유전용,김승욱,장용채,Ryu, Jeonyong,Kim, Seungwook,Chang, Yongchai 한국지반환경공학회 2022 한국지반환경공학회논문집 Vol.23 No.6
The performance of the relief wells installed for the purpose of controlling seepage of the dam embankment is affected by various parameters such as diameter, spacing, penetration rate, permeability coefficient of the ground, thickness of the foundation layer. Therefore, when the relief wells are adopted for the purpose of reducing seepage pressure, these parameters should be sufficiently reviewed to determine the installation specifications of the relief wells. This study evaluated the effect of the length of the geosynthetics blanket on the performance of the relief wells installed in the downstream part of the dam embankment with blankets in the upstream and downstream part of the dam embankment as countermeasure methods to control seepage of the dam embankment. In the relationship between the length of the upstream and downstream blanket and the discharge, the discharge of the relief wells decreases as the length of the upstream blanket increases, and on the other hand, the discharge of the relief wells decreases as the length of the downstream blanket increases. In the upper and lower blanket length-spacing relationship, as the length of the upstream blanket increases, the spacing of the relief wells increases and as the length of the downstream blanket increases, the spacing of the relief wells decreases. Therefore, when installing the relief wells in parallel with the blanket, it was found that increasing the length of the upstream blanket is more efficient than increasing the length of the downstream blanket in order to minimize the discharge of seepage discharge and to ensure economic feasibility by wider installation of the relief wells.
농업용 저수지 제방에서 3차원 수치해석에 의한 감압정의 효과 분석
유전용,허준,장용채 한국농공학회 2020 한국농공학회논문집 Vol.62 No.6
Through 3D seepage analysis of pressure relief well installed on the embankment of agricultural reservoir, the effects of reducing pore water pressureand hydraulic gradient, and increasing piping safety, depending on diameter (0.2, 0.4, 0.6 m) and space (10, 25, 50 m) of relief well, were analyzed. The conclusions drawn through this study are as follows. i) At the location of pressure relief well, pore water pressure decreases by 25.3∼62.5%, andhydraulic gradient decreases by 22.4∼55.7%. ii) Between relief wells, pore water pressure decreases by 2.7∼40.3%, and hydraulic gradient decreasesby 2.8∼47.0%, which are relatively less than at the cross section of installed location of relief well. iii) Piping safety factor by critical hydraulicgradient increases by 28.9∼125.6% at the location of relief well and increases by 2.9∼88.8% between relief wells. iv) Seepage analysis needs tobe performed by the 3D method to make evaluation of seepage at the location of relief well and between relief wells possible. v) Additional evaluationis required for various conditions such as waterhead, engineering characteristics of embankment body and its foundation, location, diameter, spacing anddepth of pressure relief well.
단면변화 및 조위영향에 따른 방조제 거동분석 - 수치 해석적 연구
유전용 ( Yoo Jeon-yong ),오영인 ( Oh Young In ),이득원 ( Lee Duk Won ),정인영 ( Jeung In-young ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
국내 · 외적으로 시공이 완료되었거나 시공이 진행 중인 방조제 및 흙댐 구조물에 대하여, 장기적으로 지속가능(Environmental Sustainable)한 다기능화와 자연친화적 환경을 조성하기 위한 구조물 숭상, 확장, 친환경공법 적용 등 다양한 형태로 기존구조물의 단면변화가 시공 및 계획되고 있다. 일반적으로 기존구조물에 대한 단면형상 변화 및 추가기능 요구 시에는 일차적으로 기존구조물의 기능, 전체적인 안정성 등 세심한 검토를 수행하여야 한다. 특히 방조제 구조물과 같이 복잡한 단면형상, 조위하중 및 불연속면을 내재한 경우 침투류 변화, 사면안정성을 비롯하여 응력-변위해석을 통한 보다 세밀한 거동검토가 요구된다. 본 연구에서는 방조제의 단면형상 변화 및 조위영향에 따른 수치 해석적 연구를 수행하였으며, 각각의 영향인자에 대한 침윤선 및 간극수압 분포, 사면안정성, 응력집중 현상 등에 대하여 분석하였다. 본 연구에서는 수치 해석적 방법을 통하여, 방조제의 단면변화와 조위 및 수위변화에 따른 거동연구를 수행하였다. 특히, 단면변경은 기존설계단면에 대하여 도로 숭상이 계획된 단면을 설정하여 침투류해석, 사면안정해석, 응력-변형해석을 수행하였다. 전체 수치해석적 연구 분석에 따른 총괄결론은 다음과 같다. 1. 복잡한 불연속 경계단면과 조위변동이 심한 방조제의 단면변경 시, 침윤선분포 및 간극수압분포 등 다양한 침투류 특성의 변화가 예상되며, 침투류특성 변화에 따라 방조제의 안정성, 기능수행에 영향을 미칠 수 있으므로 이에 대한 세밀한 검토가 요구된다. 2. 도로숭상에 대한 응력-변형해석 결과, 성토체의 자중증가와 차량하중 인접으로 인하여 약 30%의 침하량이 증가하는 것으로 도출되엇으며, 성토체와 1차사석단면의 경계면인 필터층 부근에서 전단응력및 전단변형율의 증가가 도출되었다. 따라서, 방조제의 도로숭상에 대한 단면변경의 경우, 조위가 유지되는 필터층에 대한 세밀한 검토와 보강이 요구된다. Recently, many construction remodeling, extension, and environmental technology was conducted to existing dike and embankment dam for multi-usage and environmental sustainable demand. When the Change of existing structure and design, however, should be need many check point about the overall stability and function of structure. Especially, dike need more careful examination, because there have many discontinuous surface and tidal variation. In this paper presents the numerical analysis of dike behavior with loading condition and tidal variation. This study performed three type numerical analysis(Seepage, Slope stability, stress-deformation analysis).
유전용 ( Yoo Jeon Yong ),오영인 ( Oh Young In ),전상옥 ( Jeon Sang-ok ),정인영 ( Chung In-young ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
Usually, the main body of sea dyke is embanked by good quality banking material from in-land. Saemangeum sea dyke is constructed by dredging seabed soil and reclamation technology, however, because the shortage of in-land banking materials and economical benefit. Therefore, the main body of sea dyke by dredged marine sand is placed over the bottom protection layer(rubble and large crushed stone) that has completely different permeability characteristics. Especially, the final closure of sea dyke is most dangerous due to the fast velocity of tidal flow. The final closure section is consisted with vast rubble and heavy stone gabion, therefore the discharge velocity toward the land side of final close section is irregularly and sometime occur the fast discharge velocity. In this study, the seepage model test and field monitoring performed to evaluate permeability characteristics of bottom protection layer filled with dredged marine sand. Based on model test and field monitoring, the bottom protection layer is gradually filled by dredged marine sand during dredging and reclamation period. Also, the coefficient of permeability of bottom protection layer filled with dredged marine sand is 8.0×10<sup>-6</sup>~1.0×10<sup>-5</sup>m/sec.
유전용 ( Yoon Jeon Young ),강병윤 ( Kang Byung Yoon ),김현태 ( Kim Heon Tae ),최경영 ( Choi Kyoung Young ),양영철 ( Yang Young Chul ),권태영 ( Kwon Tae Young ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
A study was performed to examine the soil environment, vegetation type to the inside slope of sea dike. The soil pH was about 8.5, electric conductivity was 4.59 dSm<sup>-1</sup>, soil strength was 12.1mm, organic matter was 0.21 %. The vascular plants of the inside slope of sea dike were consisted of 101 taxa such as 26 families, 80 genera, 93 species, 8 varieties, 1 hybrid. The life cycle of the plants was annual 38.6%, biennial 14.8%, perennial 46.5%. As it compared with consistency ratio in the flora of korea, the distribution of annual, biennial appeared highly. From this examine, it appears that the environment need soil improvement using water holding materials and organic supplements.