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채움재의 입자크기에 의한 지오그리드의 내시공성 감소계수 해석
김원춘,전한용,Jin, Yuan-Chun,Jeon, Han-Yong 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.4
Three types of geogrid were installed with differently sized filling particles. Residual tensile strength decreased only slightly when small particles were used. Larger particles greater affected the PET filaments, sharply reducing residual tensile strength. Particle size distributions affected the grids' average installation damage factors, while irregularly distributed large particles determined the actual installation damage. Installation damage reduction factors were calculated through analysis of the filling materials' particles; the results were compared with those from lab index testing.
실내 시공 시 손상 시험에 의한 지오그리드 전단거동 해석
김원춘,김수경,김초롱,강세구,장용채,이상덕,전한용,Jin, Yuan-Chun,Kim, Su-Kyung,Kim, Cho-Rong,Kang, Se-Gu,Chang, Yong-Chai,Lee, Sang-Duk,Jeon, Han-Yong 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3
Geogrids and geotextiles' shear behaviors were evaluated after installation damage testing. Frictional coefficients of resistance to direct sliding ($f_{ds}$) were estimated by theoretical shear analysis. The shear strength of the damaged geogrid decreased under a high normal stress of 150 kPa; that of the geotextile decreased with increasing normal stress. fds values were found to be lowered by installation damage, through comparison of $f_{ds}$ values calculated by direct theoretical shear analysis before and after installation damage.
Yuan-Chun Jin(김원춘),Sang-Hoon Park(박상훈),Ji-Yeon Han(한지연),A-Ram Lee(이아람),Yong-Jun Lee(이용준),Han-Yong Jeon(전한용) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
Tensile properties of geogrid are affected by the creep, installation damage, chemicals etc. So, the long-term design strength of the geogrid reinforcement is reduced by these reduction factors. GRI-GG4 presented that total reduction factor is simply multiply of each factors. But in fact these reduction factors are complexly affected to long-term properties. And one factor can affect to another factor. In this paper combination effect of installation damage, creep resistance, chemical resistance was tested and found that the total reduction factor is lower than that of the calculated factor.
Effect of Particle Size for Filling Material on Reduction Factors by Installation Damage of Geogrids
김원춘(Yuan-Chun Jin),정유진(You-Jin Jeong),박주희(Ju-Hee Park),유중조(Jungjo Yuu),전한용(Han-Yong Jeon) 한국토목섬유학회 2010 한국토목섬유학회 학술발표회 Vol.2010 No.11
In this paper, 3 types of geogrids were installed in different size of particles. Residual tensile strength slightly decreased in small size of particles. When the particles were big enough to start to affect to the PET filaments, residual tensile strength sharply decreased as particle size increased. Size distributions decide average of installation damage factor and irregularly of large particles distribution decides real installation damage factor. This study calculated installation damage reduction factor through analysis of filling material particles and the results of this method are analyzed and compared with those of the lab index test.
Interpretation of Seam Property by Geosynthetics Bonding Method
전한용(Han-Yong Jeon),김원춘(Yuan-Chun Jin),이용준(Yong-Joon Lee),최용석(Yong-Suk Choi),백운일(Un-il Baek) 한국지반신소재학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.11
8 Geotextiles(; 4 woven and 4 nonwoven types), 4 geogrids and 2 geocomposites of [nonwoven/fibers/nonwoven] structure were used to compare the seam properties. Tensile strength retentions of these geosynthetics were evaluated as the degree of damage by chemical degradation. Woven geotextiles showed the higher seam strength in the order (SSd-1 < SSd-2) > (SSa-1 < SSa-2) > geospacer without regard to the design strength. For nonwoven geotextiles, the order of seam strength is geospacer > (SSa-1 < SSa-2). Geogrids showed the higher seam strength in the order of band > geospacers but reduction factors were increased in the order of band > geospacer without regard to the geogrid’s compositions. Finally, geocomposites showed the higher seam strength in the order of geospacer > (SSa-1 < SSa-2).