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연약지반 보강을 위한 저유동성 몰탈 개량체의 응력분담비에 관한 연구
박언상(Eonsang Park),김병일(Byungil Kim),박승도(Seungdo Park) 한국지반환경공학회 2020 한국지반환경공학회논문집 Vol.21 No.9
본 연구에서는 저유동성 몰탈 주입공법의 개량체에 관한 응력분담비를 복합지반법, 지반아칭이론, 소성각법 및 2차원과 3차원 수치해석, 3차원 모형실험을 통해 평가하였다. 복합지반법으로 계산된 응력분담비는 89.3, 3차원 지반아칭이론을 적용할 경우 3.75~59.0, 3차원 소성각법의 경우 82.8로 이론별 응력분담비의 차이가 나타났다. 2차원 수치해석 결과 응력분담비는 63.0~77.0으로 개량율이 증가할수록 증가하는 것으로 나타났고, 3차원 수치해석 결과 50.0~56.0으로 2차원 해석 결과 대비 작게 예측되었다. 대형 삼축압축셀을 이용한 특수 모형 실험의 경우 하중단계별 응력분담비는 53.0~60.0으로 나타났고, 실험으로 평가한 응력분담비는 2차원과 3차원 수치해석적 예측치 내에서 측정되었다. 본 연구에서는 저유동성 몰탈 주입 공법의 개량체에 대하여 해석 및 실험값을 바탕으로 개량율에 따른 응력분담비에 대한 예측식을 제안하였다. In this study, the stress concentration ratio for the improved material of the low slump mortar grouting was evaluated through the composite ground method, the ground arching theory, the plastic angle method, the 2D and 3D numerical analysis and the 3D model experiment. The stress concentration ratio calculated by the composite ground method was 89.3, 3.75~59.0 when the three-dimensional ground arching theory was applied, and 82.8 for the three-dimensional plastic angle method. As a result of the 2D numerical analysis, the stress concentration ratio was 63.0~77.0, which was found to increase as the improvement ratio increased. The results of 3D numerical analysis were predicted to be 50.0~56.0 smaller than the results of 2D analysis. In the case of a special model experiment using a large triaxial compression cell, the stress concentration ratio for each load step was 53.0~60.0, and the stress concentration ratio evaluated by the experiment was measured within 2D and 3D numerical analysis predictions. In this study, a predictive equation for the stress concentration ratio according to the improvement ratio is proposed based on the analysis and experimental values for the improved ratio of the low slump mortar grouting.
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송해박(Hailbak Song),유정철(JengcheoI Yoo),이종화(Jooghwa Lee),유재석(Jaisuk Yoo),박경석(Kyungseok Park),황준하(Joonha Hwang),박승도(Seungdo Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
A simulation study was carried to analyze the vehicle fuel consumption on component basis. Experiments was also carried out to identify the simulation results, under FTP-75 Hot Phase driving conditions and arbitrary driving conditions. A good quantitative agreement was obtained.<br/> Based on the simulation, fuel energy was used in pumping loss(3.7%), electric power generation(O.7%), engine friction(l2.7%), engine inertia(O.7%), torque converter loss(4.6%), drivetrain friction(O.6%), road-load(9.2%). and vehicle inertia(I3.4%) under FTP-75 Hot Phase driving conditions.<br/> Using simulation program, the effects of capacity factor and idle speed on fuel consumption were estimated. A increment of capacity factor of torque converter resulted in fuel consumption improvement under FTP-75 Hot Phase driving conditions. Effect of a decrement of idle speed on fuel consumption was negligible under the identical driving conditions.
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