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화강풍화토 지반에서 배수조건에 따른 쉴드터널 라이닝의 거동연구를 위한 모형실험
최규문,윤찬영,마상준 한국지반공학회 2015 한국지반공학회논문집 Vol.31 No.6
Recently, due to the expansion of urban infrastructure for the citizen convenience, the shield tunnel construction hasincreased considering the civil complaints minimization and construction stability. Most shield tunnels are designed basedon the assumption of the undrained condition that underground water does not inflow, but they are operated in the fieldas drained tunnels with drainage facility to drain underground water. Therefore, the drained condition needs to beconsidered in the shield tunnel design. It is also necessary to consider the weathered granite soil that is widely distributedthroughout the country and consequently is encountered in most of construction sites. In this paper, the model test whichcan control total stress and pore water pressure and simulate the underground tunnel located in the weathered granitesoil below ground water level is conducted. Total stress, pore water pressure and an inflow water into an inner pipewere measured using the testing device. Test results showed that the total stress in a drained condition was lower thanin an undrained condition because pore water pressure decreased in a drained condition and an inflow water into aninner pipe was proportional to the loading stress in a drained condition. As a result, if a drained condition is consideredin the shield tunnel design, the more economical design can be expected because of the stress reduction of the lining.
배수조건에 따른 쉴드터널 라이닝의 거동연구를 위한 모형실험
최규문,윤찬영,마상준 한국지반공학회 2014 한국지반공학회논문집 Vol.30 No.5
Most shield tunnels are designed based on the assumption of a undrained condition. But they are operated as drainedtunnels in which underground water flows and passes through a drainage facility. Therefore, it is necessary that thedrainage condition be considered in the shield tunnel design. In this research, new testing device which can simulatethe underground tunnel located below ground water level, was developed. Total stress and pore water pressure wereexamined and an inflow water into an inner pipe was measured using the testing device. Test results showed that thetotal stress, which was the sum of effective stress and pore pressure, increased more in an undrained condition andan inflow water into an inner pipe was proportional to the water pressure but inversely proportional to the loading stress. Consequently, if the drainage is considered in the shield tunnel design, the more economical design can be expectedbecause of the stress reduction of the lining.
최규문,이승우,윤찬영 한국방재학회 2015 한국방재학회논문집 Vol.15 No.2
In this study, risk assessment for the debris-flow hazard which caused casualties and property loss in the area of Neungwon-ri, Yongin in July, 2011 was performed. Considering the return period of rainfall, debris flow volume was estimated. Dynamics of debris flow and impact range was also simulated by numerical approach. Based on the result of numerical analysis, impact pressure and vulnerability of building was calculated according to flow depth and velocity of debris flow. Finally risk assessment was performed based on the economic value of each building. Risk assessment showed that the longer the return period induced the high impact pressure and vulnerability regardless of a structure type. In addition, under a similar hazard situation, non-concrete frame building was more vulnerable than the reinforced concrete frame building. 류 재해에 대한 리스크를 분석하였다. 토석류 재해 발생지점에서 강우 재현주기를 고려하여 토석량을 산정하였으며, 수치적인 방법을이용하여 토석류 거동을 모사하고 토석류 영향범위를 산정하였다. 또한 수치적 방법으로 평가된 토석류의 높이와 속도를 바탕으로 충격압 및 취약성을 계산한 후, 건물의 경제적 가치를 고려하여 리스크 평가를 수행하였다. 리스크 평가결과, 재현주기에 따른 충격압과취약성은 건물의 골조형식과 관계없이 재현주기가 길어질수록 커졌고, 비 콘크리트 골조의 건물이 보강 콘크리트 골조의 건물보다 취약한 것으로 나타났다.
鄭哲源,朴熙淳,孫鎔雨,崔圭文 圓光大學校 1989 論文集 Vol.23 No.2
이 論文에서는 最適化問題를 해결한다 : 彈牲設計에 비해 最大效率로 주어진 形態의 構造를 設計하여 모든 可能한 荷重組合下에서 그 構造의 崩壞와 그것의 臨界斷面의 first yield에 대한 어떤 지정된 最小荷重係數를 측정한다. 目的函數를 線形化하고, 모든 limit equilibrium constraint를 算出해 내는 方法을 개발하여 線形計劃法과 콤퓨터技法의 도움으로 그 問題를 해결한다. 관계되는 원리와 대응되는 最適解는 鐵筋콘크리트 連續보와 뼈대 構造를 例로서 설명되어 있다. The following optimization problem is solved in the paper : design a structure of given geometry for maximum efficiency vs. elastic design, so that under any possible load combination certain specified minimum load factors be guaranteed against both the collapse of the structure and the first yield of its critical sections. By linearizing the objective function and developing a method to generate all limit equilibrium constraints the problem is solved with the help of linear programming and computer techniques. The principles involved and corresponding optimal solutions are illustrated by the examples of a reinforced concrete continuous beam and frame.