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김유성(You-Seong Kim),고형우(Hyoung-Woo Ko) 한국토목섬유학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.4
Dynamic deformation charateristics of soils have been investigated through small strain control due to its sensitive particle structures. Joomunjin standard sand and Saemangeum dregded soils was tested using improved cyclic triaxial test. As a result, the study produces a new nonlinear model by normalizing maximum shear modulus(Gmax) and the new nonlinear model proprely describes the dynamic deformation characteristics of full range from 10-4 to 10-1 that combines results obtained from resonant column test and monotonic triaxial test.
지중송전관로 되메움재의 열저항 특성에 따른 열소산 효과
김유성(You-Seong Kim),조대성(Dae-Seong Cho) 한국토목섬유학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.4
River sand has generally used for the backfill materials for underground power cables. The thermal resistivity of it has 150oC-cm/Watt in wet condition and more than double in dry condition. In the precedent study, optimized backfill materials are developed to mix crush rock, recycled sand, stone powder, slag and floc to replace river sand. In this study, laboratory tests are performed by river sand and optimized backfill material, and finite element analysis are performed to investigate thermal dispersing effect according to thermal resistivity characteristic. As a result, optimized backfill materials shows better thermal dispersing effect than river sand in all case.
한계평형해석에 의한 연약지반 위의 철도노반 고성토를 위한 직포 보강 효과
김유성(Kim You-Seong),최재선(Choi Jae-Seon) 한국토목섬유학회 2010 한국지반신소재학회 논문집 Vol.9 No.4
직포 보강재는 연약지반 성토시 장비주행성, 지지력 및 활동안정성 개선 등을 목적으로 활발하게 적용되고 있다. 이 논문에서는 연약지반 위에 고강도의 직포를 2층 보강하여 철도제방을 성공적으로 구축한 사례를 소개하였다. 한계평형해석에 근거한 비탈면 활동안정분석결과 연약지반 위에 고강도의 직포를 2층 보강하고 흙쌓기를 수행하였을 때 제체의 활동에 대한 안전율은 0.91에서 l.14로 약 25%증가하고, 2개월 이상의 공기단축효과가 있는 것으로 나타났다. 따라서, 공기가 촉박하거나, 안전율이 다소 부족한 현장의 경우 고강도 직포보강에 의한 연약지반처리공법은 유용한 것으로 판단된다. Woven geotextiles (polyester mats) reinforcement is generally used to improve traffic ability, bearing capacity, and slope stability for embankment construction on soft ground. Cases of two high-strength woven georextiles reinforcement layers are introduced in the present paper, which has been successfully constructed for rail road embankment on soft ground. According to the case results based on the limit equilibrium analyses of slope stability, the two high-strength woven georexriles reinforcement layers on the soft ground can substantially increase the stability of the embankment by about 25%, improve the safety factor from 0.91 to 1.14, and significantly reduce the embankment construction duration at least 2 months. Therefore, the application of high-strength woven geotextiles is found to be useful for in-situ cases having the lack of construction duration and stability, as a soft ground improvement.
Effect of Non-Woven Geotextile Reinforcement on Mechanical Behavior of Sand
김유성(Kim You-Seong),오수환(Oh Su-Whan),조대성(Cho Dae-Seong) 한국토목섬유학회 2010 한국지반신소재학회 논문집 Vol.9 No.4
부직포에 의한 보강이 모래의 역학적 거동에 미치는 영향에 대해 검토하였다. 이 검토를 위해 보강모래와 무보강모래에 대한 일련의 삼축압축시험이 수행되었다. 표준사인 주문진사가 사용되었고, 부직포 보강재가 모래시료 속에 최대 3층 배치되었다. 분석결과 모래속의 부직포 배치는 모래의 전단강도를 크게 증가시켰고, 보강모래는 파괴시의 변형률도 증가하였다. 또한, 보강층수가 증가할수록 보강재에 의한 시료내 전단층의 확신 방지효과의 증가로 보다 연성화하고, 모래시료의 체적팽창 경향은 부직포 배치에 의해 억제됨이 밝혀졌다. 보강층수 증가에 의한 효과는 간극비 감소로 인한 효과와 같다. The effects of non-woven geotextiles on mechanical behavior of sand were investigated. A comprehensive series of triaxial compression rests were performed for these investigation on unreinforced and reinforced sand with geotextiles. The Joomunjin standard sand was used and non-woven geotextiles were included into sand specimen with three layers. The inclusion of non-woven geotexrile reinforcement into sand increased the peak strength of sand significantly and the reinforced samples exhibited a greater axial strain at failure. Also the effect on number of reinforcement layers was studied and found as increasing the number of reinforcement layers resulting in more ductility by clogging developed in the shear band within the specimens. It was also found that the tendency of samples to dilate is restricted by non-woven georextile inclusion. The effect of nunber of reinforcement layer increasing is just same to the effect of decreasing void ratio of sand in this case.
김유성(You-Seong Kim),원명수(Myoung-Soo Won),최정호(Jeong-Ho Choi),최용훈(Yong-Hun Choi) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.4
This paper introduces a fortification and restoration method for Geosynthetic Reinforced Soil(GRS) segmental retaining walls damaged by fire deterioration. A 7.6m high GRS retaining walls damaged by fire deterioration was considered in this case study. It was decided to reconstruct the uppermost portion of the GRS wall, hence, a 3.2m high section was excavated and a new wall was erected and filled with soil. During the construction, concerns were raised that if a building is to be constructed at the top of the wall, the wall probably fail due to tensile overstress and is feared to collapse. To solve this problem, soil nailing was applied, where long corrugated pipes were inserted onto the wall to increase the stability and prevent the facing to fail. Reinforced concrete was then poured at the front of facing to hold the corrugated soil nailing together. The project was successfully constructed without backfill excavation. This rehabilitation technique without backfill excavation is expected to be useful for damaged and collapsed walls.
김유성(You-Seong Kim),권오현(Oh-Hyun Kwon),김영신(Young-Shin Kim),원명수(Myoung-Soo Won) 한국토목섬유학회 2010 한국토목섬유학회 학술발표회 Vol.2010 No.4
The present study describes the external deformation behavior of geosynthetic reinforced soil(GRS) walls observed long-term performance. According to the results of long-term observation, a full-height rigid concrete facing is important to restrict the external deformation of GRS walls after construction of the wall. Even if geogrid and nonwoven geotextiles are exposed in the direct rays of the sun and rainfall for 12years, they are shown to function as wall facing.
Effect of Non-woven Geotextile Reinforcement on Mechanical Behavior of Sand
You Seong Kim(김유성),Yong An Lee(이용안) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.11
모래의 역학적 거동에 미치는 영향에 대해 강도와 변형계수의 변화, 응력~변형율 관계의 변화, 다이러턴시의 변화와 같은 관점에서 실험적인 방법으로 조사하였다. 실험분석결과 다음과 같은 결론을 도출하였다. 강도는 보강재 삽입층수에 따라 증가하고, 변형계수는 감소하는 경향을 보인다. 보강재층수의 증가에 따라 보강재가 전단층의 발생을 억제하여 무보강모래에 비해 보다 유연성을 보인다. 또한, 보강재의 삽입으로 다이러턴시 현상이 감소하는 경향을 보인다.