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국내 강우특성 변화에 따른 토목섬유 보강사면의 안정성에 관한 연구
김유성(You-Seong Kim),김태헌(Tae-Heon Kim),김재홍(Jae-Hong Kim) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.4
Shallow landslides and debris flows are a common form of soil slope instability within South Korea. These events may be generally initiated as a result of increasing intense rainfall or lengthening rainfall duration because of the effects of climate change. The paper presents the evaluation of rainfall-induced reinforced slope instability under vertical load (railway or highway load) throughout South Korea based on quantitative analysis obtained from 58 sites rainfall observatories for 38 years. The slope stability was performed through assumed infinite slope geometry by taking an average on maximum rainfall every ten years from 1973 to 2010. Seepage analysis is carried out on unsaturated soil slope and the factor of safety was calculated by coupled analysis using saturated and unsaturated strength parameters. The contour map (four stages) of South Korea shows landslide hazard of reinforced soil slope. The safety factor map based on long term observational data will help prevent rainfall-induced soil slope instability for appropriate design of geotechnical structures regarding disaster protection.
김유성(You-Seong Kim),조대성(Dae-Seong Cho),이광준(Kwnag-Jun Lee) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.11
The effects of non-woven geotextiles on mechanical behavior of sand were investigated. A comprehensive series of triaxial compression tests were performed for these investigation on unreinforced and reinforced sand with geotextiles. The Joomunjin standard sand was used and non-woven geotextiles were include into sand specimen with one layer. The inclusion of non-woven geotextile reinforcement into sand increased the peak shear strength of Joomunjin sand significantly and the reinforced samples exhibited a greater axial strain at failure. Also, reinforcement effect was found to increase the cohesion and deformation modulus.
새만금 지역의 액상화 평가 및 향후 구조물 기초 설계시 액상화 영향의 고려방안(Ⅰ)
김유성(Kim You-Seong),고형우(Ko Hyoung-Woo) 한국토목섬유학회 2011 한국지반신소재학회 논문집 Vol.10 No.2
본 연구에서는 국내의 대표적인 매립지인 새만금 방조제 지역을 대상으로 액상화 평가벙법에 따른 액상화 발생 기능성을 예측하였다. 액상화 평가방법에 따라 장 · 단주기 실제 지진기록을 이용해 지진응답해석과 반복삼축압축시험에 의한 액상화 평가를 수행하였다. 평가 결과 대상지역의 준설매립토의 입도분포 곡선은 액상화 기능성이 매우 높은 범위에 해당하고 있고, 검토대상 지역의 깊이 10m 이내에 기초 또는 지중구조물이 구축될 경우 액상화에 따른 피해가 예상되고 있어, 향후 기초 또는 구조물 설치 위치에 따른 세밀한 검토가 필요한 것으로 판단된다. This study presents the estimation for the possibility of liquefaction according to the liquefaction evaluation methods in Saemangeum reclamation area for tide embankment, Jeollabuk-do, Korea. Liquefaction estimation is performed by cyclic triaxial tests and seismic response analysis using earthquake records of the long- and short-term. This area appears to have greatly potential of liquefaction from the grain-size distribution curve of the dredged and reclaimed soil in the area. Because the liquefaction can occur in this area if the foundations or buried structures are built at a depth within 10m below ground surface, the meticulous care is required in the design of them in the future.
김유성(You-Seong Kim),고형우(Hyoung-Woo Ko) 한국토목섬유학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.4
This paper presents a deformational charateristics for performing cyclic triaxial tests with Joomunjin standard sand to find shear and Young's moduli and damping ratio, an improved cyclic triaxial test is equipped with LDT on the outside of a cell which has a range from 10-4 to 10-1 of shear strain, (%), instead of conventional cyclic triaxial test which has linear variable displacement transducer(LVDT) with low precision. For validation and verification of the improved epuipment, the dynamic deformation characteristics have been carried out using Joomunjin standard sand.
김유성(Kim, You-seong),박영준(Park, Young-jun),조대성(Cho, Dae-seong),방인황(Bhang, In-hwang) 한국지반신소재학회 2013 한국지반신소재학회 논문집 Vol.12 No.1
이 연구에서는 열 수송관로 직선부에서 마찰계수의 증가를 통해 관로의 최소 설치길이를 감소시켜, 현장 시공 시 매설깊이의 증가를 억제하고, 충분한 마찰력을 제공함으로써 신축이음관의 설치를 줄여 효율적인 시공이 가능토록 함과 동시에, 곡선부에서는 마찰계수의 감소를 통해 신축흡수재의 수명 연장을 도모하여 열 수송관로의 유지관리의 효율성을 향상시키고자 하는 목적으로, 현재 주로 사용되고 있는 되메움재인 강모래보다 큰 내부마찰각을 가진 되메움재와 작은 내부마찰각을 가진 되메움재를 개발하였다. 곡관부에 타이어 분말 혼합 되메움재를 사용할 경우, 관경이 커질수록 신축흡수재에 가해지는 마찰력의 감소 경향은 증가하고 있는 것으로 나타났고, 관경 900mm에서의 마찰력은 약 38% 감소를 보였다. 강모래+fly-ash 혼합 되메움재를 사용할 경우, fly-ash 혼합비 1.5%에서 최소 설치길이의 감소효과는 약 30%, fly-ash 혼합비 3%에서 최소 설치길이의 감소효과는 약 50%로 나타나고 있어, 열 수송관로의 효율적인 시공 및 유지관리가 가능할 것으로 판단된다. The objective of this paper is to minimize installation length of pipeline and to reduce burial depth for construction by increasing the friction coefficient caused by the interface between backfill material and pipeline. And then, the sufficient friction coefficient shortens the length of expansion joint pipe and gives the life extension of expansion joint absorber for efficient procedure regarding maintenance and administration of construction. The backfill material which is developed in this study has larger and smaller friction angle than that of conventional backfill material (river sand). The backfill material with tire powder provides low friction angle at curved section when pipe diameter increases in size (38% reduction at pipe diameter in 900 mm). When using backfill material with river sand and fly-ash, the mixture mixed with 1.5% fly-ash has 30% and that with 3% fly-ash has 50% reduction effect for minimum installation length of expansion joint pipe.