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폐기물 매립지 차수재 HDPE 지오멤브레인 보호용 토목섬유가 꿰뚫림 저항 평가
이광열,장용채,정진교,주창환,전한용,Lee, Kwang-Yeol,Chang, Yong-Chai,Chung, Chin-Gyo,Joo, Chang-Whan,Jeon, Han-Yong 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3
This study is focused on the protection effects of geosynthetics installed on HDPE water barrier in waste landfill to resist against puncture loads. It was conducted by a model test with various types of puncture loads created by different shapes of tools. The puncture resistance of geosynthetics installed as a protective material on HDPE (High density polyethylene) water barrier is varied with the sizes of geosynthetics and types of puncture loads. Finally, it was found that the protection effect for all kinds of geosynthetics when a truncated cylindrical shape of puncture tool is used is lower than others. Also, geocomposite as is the most effective against puncture for all types of puncture loads.
소형직접전단시험에 의한 토목합성재료의 계면마찰특성 평가
전한용,정구,정진교,Jeon, Han-Yong,Jung, Gu,Chung, Chin-Gyo 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.1
In this study, the frictional properties between geotextiles and geomembranes were estimated for utilization in the design of waste landfill systems. The shear stress at three different types of shear rates and each normal stress were evaluated by direct shear test. All eight geomembrane/geotextile interfaces showed post-peak reductions in shear strength and similar stress-strain curve patterns regardless of the type of materials. These post-peak strength reductions were apparently the polishing effects on the geomembrane surface. The shear rate showed no significant effects on the shear strength in each geosynthetic interface regardless of the type of geotextiles. The shear strength between geosynthetics interfaces increased proportional to the increasing normal stress. The parameters influencing the interface frictional properties between geomembrane and geotextile were the fiber length and type and the fiber diameter. The filament type in nonwoven geotextile exhibited higher frictional forces than other geotextiles.
유한요소해석에 의한 지오그리드의 접점 및 인장거동 해석
안병욱,임대영,이광열,정진교,전한용,An, Byoung-Wook,Lim, Dae-Young,Lee, Kwang-Yeol,Chung, Chin-Gyo,Jeon, Han-Yong 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.4
In this study, junction strength, stress distribution of geogrids and wide-width tensile behaviors were interpreted by Visual FEA/Edu program as finite element analysis. Through comparison to test values, it is examined whether the validity of prediction values by Visual FEA/Edu program was reasonable or not. For stress distribution effect of cross machine direction ribs, warp knitted type showed better than woven type. Through contour image from the results of finite element analysis, the stress change in adjacent point around the ribs could be predicted. For analysis of tensile behaviors, prediction data of finite element analysis is dependent on the tensile test data and how to devide elements and consist the finite element network of geogrids.