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RISS 인기검색어
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- 저자 : 신방웅, 김헌명, 최기봉, 이봉직 (검색결과 331 건)
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신방웅 충북대학교 건설기술연구소 1982 建設技術論文集 Vol.1 No.1
The experimental materials applied in this experiment are the homogeneous sand and 21 triads of core wall models which were tested as the same capacity. The variation of increment of seepage quantity of water amount is effected by the thickness, volume, upper and lower from slope, water level of the various types of core wall. The aim of the thesis, therefore, the theoretical and experimental studies for the shape of seepage line and seepage quantity on various core walls. The results of the experimental study are summarized as follows: 1) The shapes of the seepage line were determined for 21 types of the corewall. 2) In the fill dam with the same core wall volume, a new type of the upper and lower section of the core wall to decrease the seepage quantity was found. 3) The seepage quantity was determined for the various types of the seepage line by the experiments.
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Embankment Stability under Rapid Drawdown
신방웅,박재관,Shin, Bang Woong,Park, Jae Gwan Korean Society of Civil Engeneers 1985 대한토목학회논문집 Vol.5 No.4
수위변화(水位變化)에 따른 상이(相異)한 자유수면(自由水面)으로 인(因)하여 제체내부(堤體內部)에 응력상태(應力狀態)가 달라지므로 제체(堤體)의 안정해석(安定解析)이 필요(必要)하다. 수위(水位)가 급강하(急降下)할 경우 상류측(上流側) 사면(斜面)에서의 자유수면방향(自由水面方向)이 기초(基礎)쪽으로 바뀌어질 때, 상류측(上流側) Fill의 안전율(安全率)을 찾아 보았다. 여기서 하강(下降)하는 자유수면(自由水面)과 파괴형태(破壞形態)를 찾았으며, 또 안전율(安全率)을 구(求)하였고. 이로 강하속도(降下速度) 및 동수경사(動水傾斜)를 비교(比較)하였다. 실험(實驗)에 의한 결과(結果)는 다음과 같다. 1. 자유수면(自由水面)의 강하(降下)로 인(因)하여 상류측(上流側) Fill에 침투류(浸透流)에 의한 골동파괴(滑動破壞)가 일어나고, 파괴고(破壞高)는 각(各) 각(各)의 모형(模型)에 따라, 5~10, 9~15, 13~21(cm)이다. 2. 침투류(浸透流)에 의한 간극수압(間隙水壓)의 영향(影響)을 고려(考慮)하여 안전율(安全率)을 구하였으며, 이때 강하속도(降下速度)와 안전율(安全率)과의 관계(關係)에서 제체(堤體)의 안전상(安全上) 강하속도(降下速度)는 0.21~0.28(cm/sec)이어야 하고, 동수경사(動水傾斜)와 안전율(安全率)과의 비교(比較)에서 동수경사(動水傾斜)는 각(各) 모형(模型)에서 0.36~0.43 값보다 적어야 함을 실험상(實驗上) 알았다. Stability analysis of the embankment as to water level varation is the most important problem in the safety of the slope because the stress of embankment inside varies as to drawdown of seepage line. Especially when the water level is rapidly drawdown, because the flow direction of the free surface changes the toe of embankment, the factor of safety comes to small, therefore the embankment is dangered. For the purpose of studing these phenomena, the experimental models are built with sand in the laboratory. In the experimental consideration, the falling seepage line and the shape of failure are measured. This paper intends to study the failure slip surface, the relationship between the factor of safety and drawdown velocity, and hydraulic gradient. The results of the experimental study are summarized as follows; 1. Owing to the drawdown of free surface, sliding failure occurred in the upstream fill, the height of failure is 5~10, 9~15, and 13~21(cm) in each model. 2. In consideration of the distribution of pore water pressure Table-5 shows each factor of safety. In the relationship between the drawdown velocity and the factor of factor it's velocity should be limited to 0.21~0.28 (cm/sec), according to each models. In the relationship between the factor of safety and the hydraulic gradient within the upstream slope, it's gradient must be below 0.36~0.43.
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모래로 축조(築造)한 제체(堤體)의 사면안정(斜面安定) 해석(解析)
신방웅,최기봉,Shin, Bang Woong,Choi, Gi Bong 대한토목학회 1985 대한토목학회논문집 Vol.5 No.4
본(本) 연구(硏究)는 제체(堤體)에 있어서, 수위(水位)가 급상승(急上昇)함에 따라 제체내부(堤體內部)의 공극수압(空隙水壓)이 변화(變化)하는 제체경사면(堤體傾斜面)의 파괴현상(破壞現象)을 연구(硏究)한 것이다. 그리고 이미 발표(發表)된 근사이론식(近似理論式)을 토대로 국부(局部) 파괴현상(破壞現象)을 실험(實驗)을 통(通)하여 고찰(考察)했다. 본(本) 실험(實驗)에서 연구(硏究)된 내용(內容)은 다음과 같다. 1) 침윤선(浸潤線)에 따른 유출점(流出點)의 위치 결정(決定) 2) 유출점(流出點) 부근(部近)에서 발생(發生)되는 국부(局部) 파괴현상(破壞現象)에 대한 고찰(考察) 3) 침투수압(浸透水壓)이 제체(堤體)에 미치는 영향(影響) The author has studied the collapse of a slope with seepage occuring in sand model with a trapezodial cross section. The primary objective of this study was to examine the failure phenomenon of embankment with respect to change in void pressure at embankment slope. The contents of this experiments are as follows; 1) Determination of exit point by seepage line. 2) Evaluation of partial failure at exit point. 3) The effects of seepage force at embankment.
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신방웅,이봉직,송선호 충북대학교 건설기술연구소 1994 建設技術論文集 Vol.13 No.1
The phenomena derived from the water action on argillaceous, and especifically those of swelling, have a great significance in the geotechnical field. The influence of water variations on the time dependent weathering, progressive deterioration and slaking behaviour of some authors. In this aspect the present paper deals assentially with the absorption exhibited by some Gneiss and Shale in relation to its point load index and specific gravity. For this study, a series of somples representing two sorts of rock speciments, one samples were Gneiss and the other samples were Shale.
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신방웅,강종범,방성택,경구현 충북대학교 건설기술연구소 2000 建設技術論文集 Vol.19 No.2
In this study, the cause of piping phenomenon is reviewed by model tests for extension embankment in permeability foundation due to limit flow velocity and limit hydraulic gradient to be calculated by laboratory testing, and is examined seepage behavior characteristics according to the piping phenomenon due to a case study happened in embankment field, and it is the purpose of suppling basic data to determine design criterion. Based on this experimental and analytical study, the following conclusions were induced. The result comparing the distribution tendency of seepage line by theoretical method and FEM for flood level, is examined that Mononobe's method show many differences due to permeability coefficient variety, and Casagrande's method shows the similar tendency with FEM result. In the result of examining the piping safety, because the safety factor is different due to calculated methods such as limit flow velocity, limit hydraulic gradient, and seepage pressure, the piping safety must estimate to consider a minimum safety factor of the calculated methods. In the case of extending by soil with a large permeability coefficient in a extension embankment, it shows that the safety factor for piping decreases. Therefore, the possibility of piping must be reviewed due to the distribution of seepage line and a safety factor for piping in the case of extending embankment.
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