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프랙탈이론을 적용한 흙막이 벽체 수평변위 분석기법 연구
이창노(Chang-No Lee),고형선(Hyung-Seon Koh),박헌상(Heon-Sang Park),유찬(Chan Yu) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.11
Recently, the use of information management added field measurement and numerical analysis is important and valuable more and more. The Hurst exponent is used as a measure of long-term memory of time series. It relates to the autocorrelations of the time series, and the rate at which these decrease as the lag between pairs of values increases. Studies involving the Hurst exponent were originally developed in hydrology for the practical matter of determining optimum dam sizing for the Nile river"s volatile rain and drought conditions that had been observed over a long period of time. This study would established estimation of unknown point and prediction method used measured results which modified Hurst Index. In the result, Hurst Index on lateral displacement of retaining wall were ranged 0.7~0.9 and positive correlation as H>1/2. So it was indicated possibility for prediction lateral displacement of retaining wall. In addition, the result of Hurst Index estimated collapse field was very different from Hurst Index of generally safe field. Therefore collapse possibility would be predicted as highly rate.
이혁진(Lee Hyuk-Jin),고형선(Koh Hyung-Seon),한용희(Han Yong-Hee),김홍택(Kim Hong-Taek) 대한토목학회 2006 대한토목학회논문집 C Vol.26 No.6
쏘일네일링공법은 굴착벽체나 사면을 안정화시키기 위한 보강공법으로서, 시공성과 경제성의 이점으로 인해서 그 사용량이 증가하고 있다. 그러나 쏘일네일링공법은 대지경계선 뒤쪽으로의 시공이 불가피하며 이는 대지점용료의 문제를 초래하게 된다. 이러한 이유로 제거식 쏘일네일링공법이 개발되었으나 제거식 쏘일네일의 제거율은 50 ~ 70% 정도 밖에 미치지 못하고 있다. 이러한 문제를 해결하기 위하여 제거가 불필요하고 대지경계선 뒤쪽의 삽입시 지주의 동의가 필요없는 섬유보강플라스틱(FRP) 쏘일네일이 개발되었다. 본 연구에서는 시험시공 및 인발시험과 같은 현장시험과 수치해석을 통하여 FRP 쏘일네일링 시스템의 안정성과 거동특성을 평가하였다. 그리고 다양한 지반조건에서 현장시험시공과 인발시험을 묘사하기 위한 수치해석(FLAC 2D)을 실시하였다. 본 연구결과, 제거식 쏘일네일링 시스템과 비교하여 FRP 쏘일네일링 시스템은 제거식 쏘일네일과 유사한 거동특성을 나타냈다. 따라서, FRP 쏘일네일의 사용성과 안정성이 사용하기에 충분한 것으로 나타났으며 기존의 제거식 쏘일네일에 대한 좋은 대안이 될 것으로 기대된다. Soil nailing is a reinforcement method used for stabilizing excavated walls or slopes. Due to its much advantages such as ease of construction and economical efficiency, use of soil nailing is increased. However, the soil nail has much disadvantages for use in urban area. The soil nail needs to be installed inevitably beyond private land boundary, which causes rent for use. For this reason, removable soil nailing system was developed. However, the removal rate of this system is just about 50?70%. To resolve this problem, the Fiber Reinforced Plastic (FRP) soil nailing system which does not need to be removed and allows for the installation beyond private land, is developed. In this paper, through theoretical and experimental studies in laboratory and field such as prototype tests, pullout tests, we evaluate the stability and behavior characteristics of the FRP soil nailing system. And, numerical analyses using FLAC2D were performed with respect to various soil conditions, where prototype test for excavation wall and pullout tests were carried out. As a result of this study, the FRP soil nailing systems show similar behavior characteristics with those of removable soil nailing system. Finally, considering the serviceability and mechanical stability of FRP soil nailing systems, it is enough to be used as a good alternative of general soil nailing system.