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불연속체 해석을 이용한 Back-to-Back 보강토 옹벽의 파괴 메커니즘에 관한 연구
유충식(Yoo Chung-Sik),우승제(Woo Seung-Je),전훈민(Jeon Hun-Min),신부남(Shin Bu-Nam) 한국토목섬유학회 2011 한국지반신소재학회 논문집 Vol.10 No.2
본 논문에서는 Back-to-Back(BTB) 보강토 옹벽의 파괴메커니즘에 관한 연구내용을 다루었다. 이를 위해 모형실험과 불연속체 해석(Discrete Element Method, DEM)을 도입한 수치해석을 수행하였다. 먼저 축소모형실험에서는 일반적으로 시공되는 Back-to-Back 보강토 옹벽을 1/10로 축소하여 1-g 모델을 구축한 후 자중만으로 파괴에 도달하도록 하였으며 보강재의 길이변화에 따른 파괴 메커니즘을 고찰하였다. 아울러 모형실험 결과를 토대로 검증된 DEM 해석모델을 이용하여 다양한 시공조건에 대한 해석을 수행하여 BTB 옹벽의 폭 및 보강재 길이에 따른 파괴 메커니즘을 고찰하고 그 결과를 현재 적용되는 FHWA 설계기준과 비교하였다. This paper presents the results of an investigation on the failure mechanism of geosynthetic reinforced soil walls in back-to-back configuration using 1-g reduced-scale model tests as well as discrete element method-based numerical investigation. In the 1-g reduced scale model tests, 1/10 scale back-to-back walls were constructed so that the wall can be brought to failure by its own weight and the effect of reinforcement length on the failure mechanism was investigated. In addition, a validated discrete element method-based numerical model was used to further investigate the failure mechanism of back-to-back walls with different boundary conditions. The results were then compared with the failure mechanisms defined in the FHWA design guideline.
백투백 방식 부하시험장비에서의 토크 추정을 이용한 수명시험법 연구
김도식,성백주,이주홍,정동수 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.3
Purpose: Dynamometer and large-torque measurement sensors are required for the reliability testing of large mechanical and hydraulic drive power components. When torque meters cannot be used because of high torque, mounting problems, or high cost, it is necessary to estimate torque values. Methods: In order to solve the problems caused by high torque multiplication, test equipment is constituted by the back-to-back method and the pressure sensors are installed in the hydraulic motor and hydraulic pump in-line ports. The efficiency and torque were estimated using the hydraulic motor and gearbox modeling equations. Results: A comparison of the estimated output torque with the actual torque measured with the pressure sensors during the testing of a track drive system showed an error below 2% in the low-speed high-torque region. Conclusion: The proposed torque estimation method involving pressure sensors can be used in combination with a back-to-back-type hydraulic dynamometer for conducting life tests.
유충식,김선빈 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.12
This paper concerns the load carrying capacity of back-to-back reinforced soil wall for use in roadway and railway construction. Two test conditions, designed with due consideration of the FHWA design guideline, were first developed and a number of cases having different reinforcement lengths were tested under a surchage loading until failure. The results indicated that for cases in which two sides of reinforcements do not overlap, the wall behavior was similar to those of single wall. For cases in which the reinforcements overlap each other, on the other hand, the load carrying capacity of the wall significantly decreased when reinforced with reinforcement layers having lengths less than 50% of the wall height.