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강재스트립 보강재에 설치된 횡방향지지부재의 지지저항 특성
홍기권(Ki-Kwon Hong),윤원일(Won-Il Yoon),한중근(Jung-Geun Han),조삼덕(Sam-Deok Cho),이광우(Kwang-Wu Lee) 한국토목섬유학회 2010 한국토목섬유학회 학술발표회 Vol.2010 No.4
This study describes pullout test results in order to analysis bearing resistance of a new reinforcement. The analysis results are indicated that pullout strength of all test cases is linearly increased according to increment of normal stress, and it is higher according to increment of a number of transverse members. These mean that the increment of bearing resistance, which has effect by normal stress and a number of transverse members, caused growth of total pullout resistance. The test results are compared with theoretical equations and then the failure mechanism of transverse members is evaluated. The behavior of transverse members is closed from punching failure to general failure.
홍기권(Ki-Kwon Hong),윤원일(Won-Il Yoon),한중근(Jung-Geun Han),이광우(Kwang-Wu Lee),조삼덕(Sam-Deok Cho) 한국토목섬유학회 2009 한국토목섬유학회 학술발표회 Vol.2009 No.11
In this study, a series of the pullout tests are conducted to assess the pullout resistance of the geosynthetic strip reinforcements with or without passive resistance body. Through the tests, it could be confirmed that the effects of passive resistance body with normal stress. This means that the pullout resistance should be reflected both friction resistance and passive resistance in designing.
한중근(Han Jung-Geun),홍기권(Hong Ki-Kwon),어윤원(Eo Yun-Won),김상귀(Kim Sang-Kwi) 한국토목섬유학회 2006 한국지반신소재학회 논문집 Vol.5 No.3
지반굴착에 의한 일반적인 흙막이공과 친환경성을 만족시키기 위한 조경 및 보강옹벽 등의 시공을 동시에 적용하게 되면 시공기간이 증가하고, 이에 따른 비용도 커지게 된다. 이러한 단점을 극복하여 흙막이벽과 옹벽구조물의 기능을 동시에 가지는 옹벽겸용 흙막이벽 공법이 제시된 바 있다. 하지만 기존에 제시된 공법은 굴착깊이에 대한 한계성을 가지고 있기 때문에 본 연구에서는 기존 공법을 응용한 설계패턴을 제시하였고, 시공사례를 통하여 응용설계법에 대한 시공성 및 안정성을 평가하였다. 그 결과, 배면의 여유공간이 부족한 현장의 경우 일반적인 흙막이벽이 갖는 말뚝의 변위 및 굴착한계깊이가 다소 해결될 수 있는 공법으로서의 적용이 가능함을 확인할 수 있었다. The construction of earth retaining wall and structure which get environmental element have to appling at the same time, then construction period and construction cost increase. These system which is presented to overcomes shortcoming and have function of earth retaining wall and retention wall at the same time. However, because existing method has limit excavation depth, the advanced design pattern more than existing method, rows of pile was applied. The workability and stability of applied design method are evaluated through analyze of construction case. The results confirmed that application design method can solve displacement of pile and limit excavation depth in existing earth retaining wall.
수치해석을 이용한 앵커지지형 강재스트립 보강재의 인발거동
한중근(Jung-Geun Han),홍기권(Ki-Kwon Hong),이승현(Seoung-Hyon Lee) 한국토목섬유학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.4
This paper describes results of numerical analysis on pullout behavior of steel-strip reinforcement based on anchorage effect. The numerical analysis results is compared with pullout test results under same condition of soil and reinforcement. In the relationship between pullout force and front displacement, the analysis result differed from test's due to strain softening model. Therefore, the interface model characteristic between soil and reinforcement should be considered in the pullout resistance using numerical analysis. However, the pullout procedure can be fully confirm based on numerical analysis.
한중근(Jung-Geun Han),홍기권(Ki-Kwon Hong),이광우(Kwang-Wu Lee),조삼덕(Sam-Deok Cho),문희정(Hee-Jung Moon) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.11
The reinforced earth wall system with geogrid has been increased rapidly since 1990's in Korea, because of the economical efficiency, the convenience of installation and the graceful appearance. Therefore, the various connection systems between the wall facing and geogrid are developed for stability increasing of the reinforced earth wall. In this paper, the behavior of the reinforced earth wall using I-type connection system was analyzed with the results of field monitoring. It was confirmed that the horizontal displacement of the wall facing was 80mm and the maximum strain of geogrid was 0.93%. The reinforced earth wall using I-type connection system was being in a stable condition.
설계사례를 이용한 전면 벽체/보강재의 연결강도 평가방법에 관한 비교 연구
한중근(Han Jung-Geun),홍기권(Hong Ki-Kwon),신주옥(Shin Ju-Oek),조삼덕(Cho Sam-Deok),이광우(Lee Kwang-Wu) 한국토목섬유학회 2009 한국지반신소재학회 논문집 Vol.8 No.2
블록식 보강토옹벽의 설계 시 국부적 안정성 평가에 있어서 실험적 방법을 통한 전면블록과 보강재 사이의 연결강도에 대한 특성을 평가해야 한다. 그러나 NCMA 및 FHWA에서 제안하고 있는 연결강도 평가방법을 적용할 경우에는 다소 보수적인 평가결과 나타나게 된다. 따라서 본 연구에서는 전면블록과 지오그리드 보강재 사이의 연결강도 시험을 수행하였다. 또한 시험결과를 NCMA, FHWA 및 Soong & Koerner가 제안한 평가방법에 의해 블록식 보강토옹벽 설계사례에 적용하였다. 그 결과, Soong & Koerner에 의해 제안된 연결강도 시험으로부터 얻어진 극한연결강도를 허용연결강도로서 적용하여도 설계시 요구되는 안정성을 만족하는 것으로 나타났다. The connection strength between wall facing and geosynthetics should be evaluated by experimental method in the design of reinforced earth wall. However, the evaluation result of connection strength using the typical design method, FHWA(1996) and NCMA(1997), is excessively because of a safety factors. Therefore, this study is conducted in connection strength test between wall facing and geosynthetics, then the test result is applied to the design case by NCMA, FHWA and Soong & Koener(1997). The results confirmed that the evaluation method by Soong & Koener, which is used ultimate connection strength by connection strength test in allowable connection strength, is satisfied with stable in design.
한중근(Jung-Geun Han),홍기권(Ki-Kwon Hong),정동호(Dong-Ho Jung),김동찬(Dong-Chan Kim),이승현(Seoung-Hyon Lee),홍성철(Seong-Cheol Hong) 한국지반신소재학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.11
This paper describes results in stability evaluation for lateral movements of bridge abutment on soft ground. The potential for lateral movements of field cases are was great even though the strength increment ratio according to pre-loading and a pile construction are considered on soft ground. Therefore, the stability for lateral movements of bridge abutment can be satisfied when the ground improvement methods with a pile are applied based on consideration of soil condition. That is, the lateral movement of piles with composite ground should be analyzed.
Ⅰ형 연결장치를 이용한 전면블록/지오그리드 보강재의 연결강도 평가
한중근(Han Jung-Geun),홍기권(Hong Ki-Kwon),조삼덕(Cho Sam-Deok),이광우(Lee Kwang-Wu) 한국토목섬유학회 2009 한국지반신소재학회 논문집 Vol.8 No.3
최근 국내에서는 시공성 및 경제성이 우수하고, 수려한 경관을 연출할 수 있는 보강토옹벽의 적용이 급증하고 있는 추세이다. 일반적으로 블록식 보강토옹벽 시공시 전면블록과 보강재 사이의 연결은 블록에 미리 형성시킨 돌기(전단키형 방식) 또는 플라스틱 핀(핀형 방식)을 이용하여 보강재를 블록에 정착시키는 방식으로 이루어지고 있다. 그러나 이와 같은 연결방식은 시공중 보강재에 부분적인 손상의 원인이 되며, 이로 인해 보강토옹벽의 안정성에 문제를 야기시킬 수 있다. 따라서 본 연구에서는 기존 연결방식의 문제점을 해결하고자, 안정성을 보다 높이고 경제성은 기존 방식과 유사한 I형 연결장치를 이용한 전면블록/지오그리드 보강재의 연결방법을 개발하였으며, 현장 적용을 위하여 연결강도 특성을 평가하였다. The use of geogrid-reinforced earth wall technologies has progressed rapidly over the past 10 years in Korea because these technologies have advantages such as economical efficiency, graceful appearance, and easy construction. The geogrid used in the reinforced earth wall with concrete block facing can be subjected to damage among the upper and lower blocks and at the interface between the block and the geogrid. Therefore, when design of the geogrid-reinforced soil walls the required connection strength of the geogrid to the wall facing is an issue. In this study, new connection system between facing block and geogrid is developed to improve the damages of geogrid in the existing connection systems. The new connection devices are made of steel and have I-shape. This paper describes the test method and results of the laboratory testing for determination of connection strength in connection system using the I-type connection device.