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RISS 인기검색어
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- 저자 : 유승경(Seoung-Kyoung You) (검색결과 5 건)
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강성도에 주목한 표층처리공법으로 개량된 초연약지반의 지지력 산정방법
함태규(Tae-Gew Ham),조삼덕(Sam-Deok Cho),양기석,유승경(Seoung-Kyoung You) 한국토목섬유학회 2010 한국토목섬유학회 학술발표회 Vol.2010 No.11
This study, as basic research which was intended to develope the surface reinforcement method using reinforcement material which is applicable to very soft ground in Korea, was aimed at proposing the design parameter for the surface ground improvement method. To that end, a wide width tensile test using geotextile, geogrid and steel bar (substitute for bamboo) and 49 kinds of the laboratory model tests were conducted. And the result the study suggested β<SUB>s</SUB>, the stiffness coefficient to evaluate the stiffness effect of reinforcement materials. Then, it was also found that the stiffness coefficient, β<SUB>s</SUB> as the testing constant would be appropriate as high as 1.0, 1.1 and 1.5 for geotextile, geogrid and steel bar, respectively. And It was evaluated that the stiffness effect affecting reinforcement improvement effect would be reduced as the thickness of embeded depth increases and that RFe, the stiffness effect reduction coefficient would have positive correlation with H/B. Finally, it was confirmed that the bearing capacity gained from the method to calculate bearing capacity, which was suggested in the study, would almost correctly estimate the capacity, demonstrating the appropriateness of the proposed bearing capacity calculation method.
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연약지반 표층보강재의 인장강도와 복토두께의 지지력개선효과에 관한 실험적 연구
함태규(Tae-Gew Ham),조삼덕(Sam-Deok Cho),양기석,유승경(Seoung Kyoung You) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.4
Engineering characteristics (tensile strength, sand mat stiffness, abrasion resistance) of surface reinforcements were evaluated and indoor model test was conducted to examine the influence of the engineering characteristics of surface reinforcements on the bearing characteristics of very soft ground strengthened with surface reinforcements. According to the outdoor exposure test with geotextiles and geogrid for 30 days, the strengths of materials reduced by less than 3.0% compared with the original specimen. Such small deterioration rate is within the product deviation and experimental error tolerance, therefore, judged to be negligible in the estimation of the strength reduction coefficient. According to the pull-out test results, the abrasion resistances between sand/geotextile/clay and sand/geogrid/clay were c=0.03㎏/㎠, φ=26.5˚ and c=0.02㎏/㎠, φ=22.0˚, respectively, and that of the geotextile was larger than geogrid by 1.2 ~ 1.5 times. According to the calculation, the bearing capacity ratios of geotextile according to the sand mat were 6.10, 7.78, and 11.1, at the sand mat of 0, 5㎝, and 10㎝, respectively, showing good correlation between the sand mat thickness of the casing soil and bearing capacity.
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초연약지반의 지지력계수 N<SUB>c</SUB>에 관한 실험적 검토
함태규(Tae-Gew Ham),조삼덕(Sam-Deok Cho),양기석,유승경(Seoung-Kyoung You) 한국지반신소재학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.11
This study, as basic research which was intended to develope the surface reinforcement method using reinforcement material which is applicable to very soft ground in Korea, was aimed at proposing the design parameter for the surface ground improvement method. To that end, a wide width tensile test using geotextile, geogrid and steel bar (substitute for bamboo) and 25 kinds of the laboratory model tests with the end restraint conditions of the reinforcement that comprises the constrained and partially constrained (3 types) conditions were conducted. And the result indicated that the modulus of subgrade reaction or Nc value (5.3) apparently overestimated the bearing capacity of very soft ground such as dredged ground.
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함태규(Tae-Gew Ham),서세관(Se-Gwan Seo),조삼덕(Sam-Deok Cho),양기석,유승경(Seoung Kyoung You) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.11
This study, as basic research which was intended to develope the surface reinforcement method using reinforcement material which is applicable to very soft ground in Korea, was aimed at proposing the design parameter for the surface ground improvement method. To that end, a wide width tensile test using geotextile, geogrid and steel bar (substitute for bamboo) and 25 kinds of the laboratory model tests with the end restraint conditions of the reinforcement that comprises the constrained and partially constrained (3 types) conditions were conducted. And the result indicated that the modulus of subgrade reaction or N<SUB>c</SUB> value (5.3) apparently overestimated the bearing capacity of very soft ground such as dredged ground. and An angle of inclination, θ, between reinforcement and horizontal surface was distributed from 38˚ to 50˚ for geotextile, from 45˚ to 50˚ for geogrid and from 14˚ to 16˚ for steel bar. A radius of heaving, r, of clay ground by vertical weight at side was distributed from 0.6m to 0.7m for geotextile, from O.5m to 0.8m for geogrid, and from 2.4m to 3.0m for steel bar. In case of steel bar, r was 4 times that of geotextile. Moreover, as a result of model test by partially constraining the preload of 23.0㎏f using geotextile, the effect of bearing capacity(q₂) appeared to be the largest till the loading stress was 0.4tf/㎡ due to cohesion, while it reached 75% of the maximum bearing force after 0.4tf/㎡ due to increase in the effect of bearing capacity(q₂) caused by the tensile force of the reinforcement. Such results tended to have appeared constantly or very similarly with each other, irrespective of the type of reinforcement (geogrid, steel bar) and constraint conditions.
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실내모형실험을 통한 표면건조층이 표층처리된 초연약지반의 침하거동에 미치는 영향분석
함태규(Tae-Gew Ham),서세관(Se-Gwan Seo),조삼덕(Sam-Deok Cho),이승원(Seung-Won Lee),양기석,유승경(Seoung-Kyoung You) 한국토목섬유학회 2009 한국토목섬유학회 학술발표회 Vol.2009 No.4
In this study, eight times of indoor model experiments reproducing site conditions were performed to analyze the influence of dry surface layer(crust) in the settlement behavior of soft dredged ground strengthened with surface reinforcement material. According to the results of the experiments, the settlement reduced according to the increase of the value of stiffness normalized into tensile strength, showing that the settlement behavior of surface reinforced, soft ground heavily depends upon the stiffness, by a linear relation at -0.37 slope in log-log coordinates. For the geotextiles with relatively smaller stiffness, it was verified that dry surface layer contributes to the load distribution effect of reinforcement material changing the surface behaviors including the shift of the position of the maximum rising from the center and decrease in settlement.
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