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안광국(Ahn Kwang-Kuk),김재일(Kim Jae-Il),이처근(Lee Cheo-Keun),정태익(Chung Tae-Ick) 대한토목학회 2007 대한토목학회논문집 C Vol.27 No.2
기존의 블록식 보강토옹벽의 경우 블록과 보강재 사이의 연결을 커넥터 등으로 고정시키는 형식으로 보강재와 블록이 일체로 거동하므로 블록 전면부에 응력집중으로 블록균열이나 보강재의 파단파괴가 발생할 수 있다. 본 연구에서는 보강재의 침하를 허용하는 연결시스템을 적용한 침하형 보강토 옹벽의 거동을 평가하기 위하여 원심모형실험을 수행하였다. 실험결과는 연결부의 침하를 허용하지 않는 일반형 보강토옹벽에 대한 결과와 비교 분석하였다. 실험결과, 침하형 보강토옹벽은 80g의 중력수준에서 완전한 파괴상태에 도달하였으며, 일반형 보강토 옹벽은 69g의 중력수준에서 파괴가 발생하여 침하형 보강토 옹벽의 안정성이 우수한 것으로 나타났다. 또한, 침하형 보강토옹벽의 경우, 69g에서 전면판으로부터 0.15H지점에서 발생한 보강재의 인장력은 일반형 옹벽의 1/6~1/2 정도로 평가되었다. The conventional reinforced earth retaining wall has the connector system to fix the reinforcement and block. However, this system may cause the crack of block and the rupture of reinforcement due to the stress concentration near the face of reinforced earth retaining wall. In this study, the new connector system, which is able to allow the settlement of reinforcement, was applied to analyze the effect of connector system of reinforced earth retaining wall. The centrifugal tests for both the conventional reinforced earth retaining wall and reinforced earth retaining wall driving the settlement of reinforcement were performed to compare the results. As a result, reinforced earth retaining wall driving the settlement of reinforcement reached to the failure at 80g-level. In contrast, the conventional reinforced earth retaining wall was collapsed at 69g-level. It means that reinforced earth retaining wall driving the settlement of reinforcement has the stronger stability than the conventional reinforced earth retaining wall. Also, the tensile force on reinforced earth retaining wall driving the settlement of reinforcement was less at the point of 0.15H about 1/6~1/2 than that of the conventional reinforced earth retaining wall.
鄭元采,鄭泰益,申周植 충북대학교 엽연초연구소 1980 煙草硏究 Vol.7 No.-
This study was conducted to study the effects of meteorological elements on the yield and quality of flue-cured tobacco. Data for this study was collected in Cheongju, Chungju and Taejeon districts during the period from 1967 to 1979. 1.There was positive correlation between yield and air temperature from maximum growth stage to harvesting time. And there was positive correlation also between quality and air temperature at maximum growth stage, but not significant relationship at the other growing stage. 2.The re were negative correlation between yield and precipitation at harvesting time and between quality and topping time, respectively. 3.There were positive correlations between yield and quality and percentage of possible sunshine at and after topping time. 4.Early and long range weather forecast will be efficiently employed for tobacco cultivation. It is considered that the study on the early and long range weather forecast and on the hastening and/or delaying the planting and maturing of tobacco plants ought to be studied together.