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하중지지 구조물로서의 보강토 옹벽 - 장기거동 측면에서의 고찰
유충식(Chungsik Yoo),김선빈(Sunbin Kim) 한국토목섬유학회 2007 한국지반신소재학회 학술발표회 Vol.2007 No.11
It is well known that components of reinforced earth structures may exhibit long term deformation which may violate the serviceability requirements set by owners. Such a concern arises from the fact that reinforcement exhibit the time-dependent long term deformation. As the use of the reinforced earth technology in public sections, thorough understanding on the long term residual deformation behavior of reinforced earth structures is essential. The creep of backfill has not yet been fully explored. This paper presents the results of finite element modeling on the reinforced earth structures used in transportation infrastructures. Fundaments of creep modeling are examined. The creep modelling technique is then implemented in plane strain finite element models.
도심지 지하굴착 및 터널시공 예비설계를 위한 인공신경망 개발에 관한 연구
유충식(Chungsik Yoo),양재원(Jaewon Yang) 한국지반신소재학회 2020 한국지반신소재학회 논문집 Vol.19 No.1
본 본문에서는 도심지 지하굴착 및 터널현장의 예비설계 및 지반침하를 예측이 가능한 인공신경망 개발에 대한 내용을 다루었다. 인공신경망의 개발을 위해 먼저 다양한 도심지 터널 및 지하굴착 현장 계측자료를 수집하여 데이터베이스를 구축하고 이를 인공신경망 학습에 필용한 학습데이터를 구축하는데 활용하였다. 개발된 인공신경망은 학습에 활용되지 않은 검증 데이터 세트를 및 현장계측자료를 활용하여 결정계수(R²), 평균제곱근오차(Root Mean Square Error; RMSE), 절대평균오차(Mean Absolute Error; MAE) 등 통계적 파라메타를 근거로 하여 신뢰도를 검증하였다. 개발된 인공신경망은 도심지 굴착현장의 예비 설계 및 이에 따른 주변침하를 예측하는데 효율적으로 활용될 수 있는 것으로 평가되었다. In this paper development artificial neural networks (ANN) for preliminary design and prediction of urban tunnelling and deep excavation-induced ground settlement was presented. In order to form training and validation data sets for the ANN development, field design and measured data were collected for various tunnelling and deep-excavation sites. The field data were then used as a database for the ANN training. The developed ANN was validated against a testing set and the unused field data in terms of statistical parameters such as R², RMSE, and MAE. The practical use of ANN was demonstrated by applying the developed ANN to hypothetical conditions. It was shown that the developed ANN can be effectively used as a tool for preliminary excavation design and ground settlement prediction for urban excavation problems.
축소모형실험을 이용한 Drilling Fluid의 공벽 붕괴 방지 성능 평가
유충식(ChungSik Yoo),최정혁(JungHyuk Choi),한윤수(Yun-Soo Han) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.11
A series of reduced model tests were performed to investigate the performance of drilling fluid with different mix designs for use in bore hole collapse prevention. The model tests were carried out considering field procedures with various drilling fluids with different mix designs. It is shown that the addition of polymer to the bentonite based drilling fluid improves the performance of the drilling fluid for preventing the borehole collapse. Practical implications of the findings from this study are discussed in great detail.
축소 모형실험을 이용한 동결-융해 반복작용이 옹벽 구조물의 거동에 미치는 영향
유충식(Chungsik Yoo),장동욱(Dong-Wook Jang) 한국지반신소재학회 2014 한국지반신소재학회 논문집 Vol.13 No.3
본 논문에서는 계절적 환경변화로 인한 동결-융해 반복과정에 노출되는 옹벽구조물의 거동에 관한 축소 모형실험 연구 내용을 다루었다. 이를 위해 먼저 동결-융해 과정을 모사할 수 있는 모형 옹벽 실험 장치를 구현하고 실제 계절별 온도 변화 과정을 모사하였으며 다양한 흙의 함수비 및 뒤채움흙의 종류 등을 따른 영향 변화를 고찰을 위한 모형실험을 수행하였다. 실험 결과 계절별 온도변화에 따른 동결-융해 반복 과정은 옹벽의 변위를 증가시키고 토압을 증가시키는 것으로 검토되었다. 아울러 동결-융해 반복 사이클의 영향은 흙의 초기 함수비가 클수록 그리고 세립분을 많이 포함할수록 증가되는 것으로 검토되었다. 본 논문에서는 도출된 연구결과가 실무적 차원에서 지니는 의미에 대한 내용을 기술하였다. This paper presents the results of a reduced-scale physical model investigation into the behavior of retaining walls subject to cycles of freezing and thawing due to seasonal temperature change. Reduced-scale model walls equipped with a temperature control chamber that can simulate freezing and thawing conditions were first constructed and a series of tests were conducted with due consideration of different initial water contents of backfill soil and soil types. The results indicate that cycles of freezing and thawing process increase wall deformation as well as earth pressure acting on the wall. Also revealed was that the effect of the freezing and thawing cycles becomes more pronounced for cases with a larger initial water content and for soils with a larger fine content. Practical implications of the findings from this study are discussed in great detail.
유충식(Chungsik Yoo) 한국지반신소재학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.11
This paper presents the two field walls that demonstrate the effect of rainfall on the performance of soil-reinforced retaining wall. A field test wall constructed in Geotechnical Experimental Site at Sungkyunkwan University has been monitored for more than 8 months to study the long-term behavior of soil-reinforced retaining wall. The measured data showed a good correlation between rainfall and wall movement after wall completion. Implications of the findings are discussed.
Effect of Rainfall on Geosynthetic Reinforced Segmental Retaining wall : A Numerical Investigation
유충식(Chungsik Yoo),김선빈(Sun-Bin Kim),송아란(Ah-Ran Song) 한국토목섬유학회 2006 한국토목섬유학회 학술발표회 Vol.2006 No.4
This paper presents the results of a numerical investigation on a soil reinforced segmental retaining wall that collapsed after the completion of wall construction. A comprehensive stress-pore pressure coupled finite element analysis was additionally conducted with due consideration of both positive and negative pore pressures in saturated and unsaturated zones. The investigation revealed among other things that the inappropriate design and the low quality backfill were mainly responsible for the wall failure although the primary triggering factor was the rainfall infiltration. The results of the stress-pore pressure coupled finite element analysis provided sound evidences as to the wall performance over the rainfall period, supporting the field observation. Practical implications of the findings from this study are also discussed in view of reinforced wall design.
연약지반에 시공되는 지오그리드 감쌈 스톤컬럼의 하중지지 특성(pp.183-192)
유충식(Chungsik Yoo),김선빈(Sun-Bin Kim) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.11
This paper presents the results of numerical investigation on support mechanism of geogrid-encased stone columns for use in soft ground. A number of cases were analyzed using a axial- and 3D stress-pore pressure coupled model that can effectively model construction sequence and drainage as well as reinforcing effects of geogrid-encased stone columns. The results indicated that the geogrid encasement tends to significantly improve the load carrying of a stone column. Also revealed was that such a confinement effect depends on encasement length and stiffness of geogrid. It is also shown that there exist critical encasement length and stiffness of geogrid for a given condition.