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원심모형실험에 의한 지하굴착 붕양양상에 관한 계측 및 해석
이처근,안광국,허열 한국산업안전학회 1998 한국안전학회지 Vol.13 No.3
This paper is to investigate the failure surface and modes in a soil mass by a excavation of the model ground. To study the failure surface for the excavated slope, centrifugal model tests were performed by changing the angle of the excavated slope(60, 75, 90˚) and the ground condition(D_r=60, 90%, dry and submerged ground). Excavation was simulated during the centrifuge tests by operating a valve that allowed the zinc chloride solvent to drain from the excavation. Results of model tests were compared with those obtained with theoretical solutions using limit equilibrium analysis method. The results of model tests show that, there is a failures to create a straight line in the low angle of excavated surface and a create a circle as the angle increases. Also, as the angle of excavated surface is increasing, the angle of the failure surface increases. The failure length in the submerged ground increases approximately 1.10∼1.34 times more than that of the dry ground.
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이처근,김홍종,안광국,이명원,허열 한국산업안전학회 1997 한국안전학회지 Vol.12 No.3
The main purpose of this study is to investigate the failure surface in a soil mass by a excavation of the model ground. The failure mechanism of an earth structure is usually determined from field failure observations or from laboratory model tests at failure. To study the failure surface for the excavated slope, laboratory model tests were performed by changing the angle of the excavated slope and the ground condition. Results of the laboratory model tests were compared with those obtained with theoretical solutions using limit equilibrium analysis method. The results of model tests show that, there is a failure to create a straight line in the low angle of excavated surface and a create a circle as the angle increases. As the angle of excavated surface is increasing, the angle of the failure surface increases too. In the angle of the failure surface, the submerged ground is less than the dry ground at 3. 2˚.
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이처근,허열 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2
This paper is focused on an experimental study in order to investigate the utilization of sewage sludge ash as the cover and liner materials for the waste disposal landfill or as construction materials. A series of tests were performed to evaluate the basic properties, compaction, compressive strength, consolidation, permeability, and CBR of sewage ash. Specially, clay bricks were made as increasing replacement ratio of sewage ash (such as 5, 10, 15, 20, 25, 30%). And tests were fulfilled for its quality. Bentonite and lime were used as the additives to improve permeability properties of sewage sludge ash. As a result of tests, it was shown that the permeability coefficient decreases as increasing bentonite content and the percentage of bentonite was needed roughly 20% to keep the permeability coefficient below 1×10^(-7)c,/sec. It was shown that the compressive strength decreases as increasing the replacement ratio of sewage sludge ash and the maximum replacement ratio of sewage sludge ash to satisfy the quality standards of the third degree bricks was about 15%.
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Unpropped Diaphragm Wall 거동에 관한 원심 및 수치모델링
이처근,안광국,허열,Lee, Cheo-Keun,Ahn, Kwang-Kuk,Heo, Yol 한국지반공학회 2001 한국지반공학회논문집 Vol.17 No.2
본 연구에서는 화강풍화토 지반상 unpropped diaphragm wall의 거동을 연구하기 위하여 벽체의 근입깊이와 지하수위 조건을 변화시키면서 원심모형실험을 수행하였다. 원심모형실험시 diaphragm wall은 두께 8mm인 알루미늄합금을 사용하였으며, 지반굴착을 재현하기 위하여 zinc chloride 기법을 이용하였다. 수치해석은 대부분의 지반공학문제에 적용할 수 있는 SAGE CRISP 프로그램을 이용하였다. 수치해석에서 모형지반은 수정 Cam-Clay 모델, diaphragm wall은 탄성모델, 지반과 diaphragm wall 사이의 경계면요소는 슬립모델을 사용하여 2차원 평면변형률 조건으로 해석을 수행하였다. 모형실험 결과 파괴면의 직선적인 형태로 파괴면내의 배면측 지반은 벽체를 향하여 하향의 변위를 일으키면서 벽체의 회전에 의해 파괴되었다. 실험 및 유한요소해석 결과 지반의 최대침하량과 최대침하량이 발생하는 위치는 잘 일치하였으며, 깊이에 따른 벽체변위는 선형적인 관계를 나타내었다. 또한, 최대 휨모멘트와 근입깊이로 정규화한 최대 휨모멘트 발생위치($h_{Mmax}$/d=0.4)는 잘 일치하였다.
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이처근,허 열,남기복 충북대학교 건설기술연구소 1999 建設技術論文集 Vol.18 No.1
Propped retaining walls are frequently used to retain the sides of road and cuttings, and to form temporary cofferdams to enable the construction of underground structures. These walls maintain stability and prevent excessive soil movement. The magnitude of the soil movements will depend on the geometry of the cutting and wall, the properties of the wall, and the position of the props. In this study, centrifugal morel tests were performed to investigate the behavior of flexible and rigid earth retaining walls supported by props in the process of the step excavation. Jumunjin standard sand was used for foundation soil. The raining method was adopted to form the required relative density of the model ground. The model tests were fulfilled by increasing g-level(40g) to get in-situ condition, and at rest earth pressure is measured at every five g-level. During excavations and installation of prop, horizontal displacement and lateral earth pressure are measured by UPC board and PC at each step. The magnitude and the distribution of lateral earth pressure measured from tests were compared with those obtained by Tschebotarioff's and Terzaghi-Peck's methods. Also, the horizontal displacement measured from tests was compared with those obtained by elasto-plastic beam analysis method.
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이처근,허열,허백 충북대학교 건설기술연구소 1999 建設技術論文集 Vol.18 No.2
Recently, the construction at weak ground has been increased for more efficient national land development in our country. Therefore, all structures have been required more safe foundation. For that reason, large diameter and depth steel pile usage are increased. These piles are mostly driven pile or embedded pile. And, these method have been happened many problems about a noise and vibration. In this study, we compared screwed steel pile that is no noise vibration with driven steel pile for bearing capacity by the static and dynamic pile load tests. Static load tests were performed for two of the test piles on the 7th day following initial driving. Dynamic load tests were performed on screwed steel piles after end-of-drive. In order to determine point resistance and skin resistance of pile, Case analysis was performed on stress-waves measured with a Pile Driving Analyzer. Also, the results of pile load tests were compared with those obtained with theoretical solutions using bearing capacity formulae. On the other hand, we investigated the workability, economy and practicality of screwed steel pile. The results of pile load tests show that driven steel pile had a larger allowable bearing capacity than the screwed steel pile. Also, the total construction cost of screwed steel pile was 37% more than that of driven steel pile.
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