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실내 진동 모형실험을 통한 철도 노반재료의 소성변형특성
신은철(Shin Eun-Chul),강현회(Kang Hyoun-hoi),최찬용(Choi Chan-Young) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Analysis of settlement of foundation under the cyclic loading is very important element in the field construction. The fatigue of construct is inflicted by wheel load of mobile unit with railroad and superhighway. The settlement behavior under the cyclic loading is investigated through Power Model by Li and Selig. However, the settlement tendency of foundation appears to be the settlement of general Europe cohesive soil. In this study, the Power Model was used to determine the plastic deformation for sandy soil. Based on the laboratory cyclic loading test a, m, b parameters, for using in the Power Model were presented.
신은철(Eun-Chul Shin),강정구(Jeong-Ku Kang),강현회(Hyoun-Hoi Kang) 한국토목섬유학회 2008 한국지반신소재학회 학술발표회 Vol.2008 No.4
Recently, utilization of the geotextile structure is being increased as a structure for protecting beach line and as also a structure for using temporary dike. The mechanical behaviors of stacked geotextile tubes are very complex and they are involved in the properties of the filling material, geotextile, and foundation soil. This study analyzed the displacement behavior of geotextile tube structure which was constructed in Incheon Bridge construction site. It is included that a measurement of tube structure settlement, and it is compared with the result of numerical analysis. The displacement and tensile strength of constructed tube indicated that the largest value was occurred at the surface of circumferential direction. The vertical pressure is contributed to equivalent pressure in the 1st layer, however, when the upper load is increased, the pressure was concentrated on the center of tube structure and then it induces the differential settlement on the ground. The total settlement on the top of stacked geotextile tube occurred about 1.8m from the ground level. As a result of analyzing, the stacked geotextile tube structure is safe in terms of the external and internal stability. However, it has to be considered the reduction of height caused by the settlement of filling material, scouring of the ground by velocity of tidal level, losing of fine material by flow of water. It is confirmed that the similar behavior was observed through the numerical analysis by FLAC for stacked geotextile tube.
신은철(Eun Chul Shin),류병현(Byung Hyun Ryu),강현회(Hyoun Hoi Kang),황순갑(Soon Gab Hwnag) 한국지반신소재학회 2014 한국지반신소재학회 논문집 Vol.13 No.4
이 논문에서는 현장모형 실험을 통하여 동결온도에 따른 상수도관의 거동변형특성을 다루었다. 동결 온도 조건에 따라 상수도관에 미치는 동상압력과 Marston-Spangler 이론에 의한 동상 압력은 다소 차이를 나타내는 것을 보이며, Marston-Spangler이론만으로 관에 작용하는 하중을 고려하는 것은 안전측을 벗어날 수도 있다는 것을 염두 해야 한다. 또한 현장모형실험을 통한 상수도관의 변형률은 수치해석결과보다 작은 값을 나타내는 것을 확인하였다. This paper presents the results of a field pilot test about deformation of water supply pipelines due to freezing temperature. There is a difference between for frost heaving load to act on the water supply pipelines. If the Marston-Spangler theory is only considered for the frost heaving load to act on the water supply pipeline, it is likely to deviate from the safety of the water supply pipeline, strains of the water supply pipeline show a tendency of smaller value than the value of numerical analysis.
신은철(Shin Eun-Chul),손원익(Son Won-Ik),김성환(Kim Sung-Hwan),강현회(Kang Hyoun-Hoi) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Railroad, the structure maintenance and restoration project was increased and widely performed in concrete pavement road and airport, building at downtown area, bridge abutment, and other concrete structures. Especially, the ground reinforcement technique by quick-reaction expansible resins is the most effective countermeasures against differential settlement and undesired deformation of structure. In this paper, the unconfined compressive strength and some environmental related tests were conducted to evaluate compressive strength and environmental effect of quick-reaction expansive resins and soil mixtures. Also, three case histories of concrete structure and railroad restoration project are presented. Based on the laboratory test, the quick-reaction expansible resins and soil mixture represent the sufficient compressive strength and the leachate material is satisfied the environmental regulation limits. As a result of this study, the structure restoration technology using quick-reaction expansible resins is very effective for restoration of differential settlement and deformation, and it is environmentally sustainable technology.
최찬용(Choi Chan yong),신은철(Shin Eun chul),강현회(Kang Hyoun Hoi) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.7
동절기와 해빙기의 기온차가 큰 지역에서는 일정 깊이까지 동결, 융해 작용이 반복적으로 발생하여 흙의 역학적 특성이 변화를 보이게 된다. 특히 세립분이 많은 흙인 경우 팽창과 수축을 통한 입자의 재배열 등으로 인하여 노반의 연약화가 많이 발생된다. 이러한 노반의 연약화는 지지력이 낮은 지반에서 반복하중이 재하 되었을 때 급격하게 나타날 수 있다. 본 연구에서는 국내의 철도 노반재료로 사용되는 대표 토질 3가지를 대상으로 세립분의 함유량, 간극비의 영향 등을 고려하여 동결융해 반복횟수에 따른 직접전단 시험을 실시하여 그 감소량을 정량적으로 평가하였으며, 이를 통하여 세립분의 함유량과 함수비 조건, 동결융해 횟수 등을 고려할 수 있는 전단강도 저감 모델 식을 제안하였다. In seasonal frozen areas with climatic features, which have a temperature difference in the winter and thawing season, changes of mechanical properties of the soil in the zone could be seen between the freezing and thawing surface. In particular, in soil with many fine particles, a softening of the roadbed usually occurs from frost and thawing actions. The lower bearing capacity is a rapidly progressive the softening of roadbed, and occurred a mud-pumping by repeated loading. In this study, the three kind of sandy soil with contents of fine particles were conducted by directly shear box test with the number of cyclic in freeze-thawing and the water content of soil. Subsequently, the relationship between the shear strength and freeze-thaw cycling time was obtained. The shear strength was decreased with the increase of the freeze-thaw cycling time. A shear stress deterioration of the soil with power function modal is proposal.