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김욱기(Uk-Gie Kim),최창호(Changho Choi),조삼덕(Sam-Deok Cho) 한국지반신소재학회 2013 한국지반신소재학회 학술발표회 Vol.2013 No.4
This paper presents a case study of pack-micropile application for seismic retrofit project of old elementary school building. The method of structural mitigation for seismic reinforcement was investigated and, as a result, displacement amplification damper system and shear wall were designed to install for the building. These structural reinforcement requires additional bearing capacity of foundation. Correspondingly, 28 pack-micropiles were additionally installed at the bottom of shear wall and dampers. The pack-micropile provides a specific way to grout bore-hole to increase frictional resistance between surrounding soil and pile-structure. In order to increase such resistance woven geotextile is wrapped to the reinforcement steel pipe for pressure grouting. Grouting materials are mainly injected in two steps: (1) gravity-type grouting inside drilling steel-casing and (2) pressurized grouting into the geotextile pack after inserting reinforcement and removing the drilling steel-casing. The second step builds a tight interface between surrounding ground and pile-structure and provides higher frictional bearing resistance. The tensile proof load tests were performed for the installed pack-micropiles according to the FHWA guideline. Test result showed that the measured ultimate load capacity satisfies the design capacity.
점성개질제를 이용한 수중 불분리성 그라우트재의 수중 속채움 보강 특성 분석
김욱기(Uk-Gie Kim),조삼덕(Sam-Deok Cho),박봉근(Bong-Geun Park),김주형(Juhyong Kim) 한국지반신소재학회 2013 한국지반신소재학회 논문집 Vol.12 No.2
본 연구에서는 계면활성제계 개질제를 이용하여 수중에서 재료분리가 발생하지 않으면서도 유동성을 충분히 갖는 수중 불분리성 점탄성 그라우트재와 일반 그라우팅 재료의 강도 특성과 속채움 보강 재료로서의 특성을 분석하였다. 특히, 해수를 활용하여 점탄성 그라우팅 재료를 제작하는 경우에 대해 중점적으로 시험을 수행한 결과, 담수를 사용하여 그라우트 재료를 제작하는 경우와 마찬가지로 수중 불분리성 특성을 잘 나타내었으며, 이에 따른 균질한 점탄성 그라우트재의 강도를 확보할 수 있을 것으로 평가되었다. 또한, 모형시험을 통해 그라우트재의 침투성을 이용하여 속채움 골재의 보강특성을 평가한 결과, 수중 불분리성 그라우팅 재료는 일반 그라우트재와 비교하여 충분한 강도가 발휘되었으며, 점성에 의한 수중 불분리 특성으로 속채움 보강재로서 좋은 시공 품질을 확보할 수 있을 것으로 평가되었다. This study introduces strength characteristics of the anti-washout grouting material using viscous modifiers and its characteristics mixed with coarse materials. Especially, this study focused on the strength characteristics of the grouts mixed with sea water. It is found that the anti-washout grout mixed with sea water has enough strength and good resistance to segregation just like that with fresh water. Also, a small scale test was performed to evaluate the solidification characteristic of the anti-washout grout mixed with coarse fill materials. It is also found that the strength of anti-washout grout mixed with coarse fill materials is greater and better segregation resistance than those of conventional grout with fill materials.
김욱기(Uk-Gie Kim),Zhuang Li,이광우(Kwang-Wu Lee) 한국지반신소재학회 2014 한국지반신소재학회 논문집 Vol.13 No.4
본 연구에서는 광역 부지나 현장 접근성이 용이하지 않은 현장의 지반조사를 신속·정확하게 수행하기 위한 목적으로 해외에서 널리 사용되고 있는 동적 콘 관입시험기를 개선한 개량형 동적 콘 관입시험기를 개발하였다. 기존의 동적 콘 관입시험기의 장점인 휴대성, 간단한 시험방법 등은 그대로 반영하는 한편, 하부 로트의 결합 연장을 통하여 기존 시험기의 지반 관입심도 1m에서 6m까지 관입되도록 고안하였다. 또한, 해머(2+3+3kg), 콘(3type) 등의 조합으로 독일식/일본식 간이 동적 콘 관입시험기(Tsukuba, PWRI, SH type)와 동일한 제원으로 시험이 가능하며, 심도가 깊어짐에 따라 시험 결과에 영향을 미치는 수직도를 확보할 수 있도록 보조 장치를 적용시켰다. 이렇게 개발·제작한 개량형 동적 콘 관입시험기의 적용성을 평가하기 위하여 국내/외 현장의 다양한 지반에 대하여 시험을 수행하여 그 신뢰성을 확보하였다. For quick and accurate ground investigation in wide construction site being not easy to access, advanced dynamic cone penetration test equipment was developed based on widely used equipment abroad. Advantages of existing equipment of portability and simple testing method were reflected in the new developed equipment. Meanwhile, by extending connection of lower rod, penetration depth is raised to 6m from 1 m of the existing equipment. Moreover, by assembly of hammer (2+3+3kg) and cone (3 types) etc., it is possible to perform test under the same conditions with those by German and Japan dynamic cone penetration test equipment (Tsukuba, PWRI and SH types). Auxiliary equipment was applied to make sure of perpendicularity as penetration depth increases. Applicability of the new developed equipment was evaluated through tests on various fields and its reliability was verified.
단입자파쇄강도에 기초한 화강풍화토의 압축특성에 미치는 수분의 영향
함태규,김욱기,Ham, Tae-Gew,Kim, Uk-Gie 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.11
In order to investigate the influence of the water on compression characteristic of decomposed granite soils, a single particle crushing test and one-dimensional compression tests were carried out on three decomposed granite soils and Silica sand. The initial fracture strength for single particle reduced and variability of the strength increases due to weakening by existing water. Moreover, it was recognized that one-dimensional compression characteristic was related to the initial fracture strength characteristic, and the initial fracture strength also has the effect of weathering.
이준용,유찬,김욱기,김동욱,Lee, Joon-Yong,Yu, Chan,Kim, Uk-Gie,Kim, Dong-Wook 한국농공학회 2012 한국농공학회논문집 Vol.54 No.5
Accurate modeling rainfall induced landslide and slope stability requires a detailed knowledge of the distribution of material strength characteristics and suction distribution. However, material properties obtained from the drying cycle are still used for infiltration analysis in many cases, even though material properties of wetting cycle are quite different from those of drying cycle due to hydraulic hysteresis and air occlusion. Therefore, the selection of proper material properties such as soil-water retention curve (SWRC) and the hydraulic conductivity function (HCF) reflecting characteristics of wetting cycle and air occlusion is an essential prerequisite in order to simulate the infiltration phenomena and to predict the suction and water content distribution in unsaturated soils. It is concluded that the simulation of infiltration with material properties from the drying cycle did not reasonably match with experimental outputs. Further discussion is made on how to describe the material properties considering air occlusion during wetting cycle over the entire suction range in order to simulate infiltration phenomena.
이준용 ( Joonyong Lee ),김동욱 ( Dongwook Kim ),김욱기 ( Uk-gie Kim ),박재현 ( Jae-hyeon Park ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-
불포화지반에서의 신뢰성있는 흐름 모델링은 산사태, 사면, 포장 등과 같은 지반공학문제들을 풀기 위한 필수적인 전제조건이다. 하지만, 불포화 지반에서의 흐름특성에 대한 묘사는 적절한 입력 변수들의 선정 및 모사의 어려움으로 인하여 여전히 진행 중이며 많은 연구자들의 주 연구과제로 남아있다. 본 논문에서는 불포화토 내에서의 흐름특성인함수특성곡선과 투수계수를 결정하기 위하여 플로우 펌프 시스템을 이용하였다. 건조과정에서의 실트질 모래의 함수특성곡선을 측정하기 위하여 플로우 펌프 시스템의 흡입력-포화도 조절기법을 이용하여 시간에 따른 응답흡입력과 함수특성곡선을 측정하였으며, 측정되어진 응답흡입력과 함수특성곡선에 부합하는 투수계수곡선을 측정하기 위하여 역해석기법을 사용하였다. 실험결과를 통하여 불포화토의 흐름특성의 규명은 매우 신중한 접근이 필요하며, 또한 여전히 흐름특성을 규명하기 위한 더 많은 연구가 요구된다. Reliable modeling of flow in unsaturated soils is an essential prerequisite for discovering the triggering mechanism of geotechnical engineering problems in the fields of landslide, slope stability, and pavements. However, the characterization of the flow phenomena in unsaturated soils is still incomplete and challengeable, since the ability of determining the relevant flow parameters and of describing flow phenomena is still limited. This paper introduces our recent efforts to determine the hydraulic characteristics of unsaturated soils. A flow pump system and an inverse problem solution approach were used in order to characterize the hydraulic characteristics under drying process. A silty sand was used in this study for investigating flow phenomena in unsaturated soils. Using the flow pump system, suction-time relationship and soil-water retention curve (SWRC) during drying process were examined, and hydraulic conductivity function (HCF) was obtained from an inverse problem solution approach. From the results, it is concluded that a careful attention should be needed to model the flow phenomena in unsaturated soils and much of future research on the fundamentals is still required.