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단입자파쇄강도에 기초한 화강풍화토의 압축특성에 미치는 수분의 영향
함태규,김욱기,Ham, Tae-Gew,Kim, Uk-Gie 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.11
In order to investigate the influence of the water on compression characteristic of decomposed granite soils, a single particle crushing test and one-dimensional compression tests were carried out on three decomposed granite soils and Silica sand. The initial fracture strength for single particle reduced and variability of the strength increases due to weakening by existing water. Moreover, it was recognized that one-dimensional compression characteristic was related to the initial fracture strength characteristic, and the initial fracture strength also has the effect of weathering.
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.
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.
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.
보강재의 강성도를 고려한 연약지반 표층처리공법 지지력 산정방법에 관한 연구
함태규(Ham Tae-Gew),서세관(Seo Se-Gwan),조삼덕(Cho Sam-Deok),양기석(Yang Kee-Sok),유승경(You Seung-Kyong) 한국토목섬유학회 2009 한국지반신소재학회 논문집 Vol.8 No.2
본 연구는 국내의 초연약지반에 적용 가능한 표층보강재를 이용한 연약지반 표층처리공법을 정립시키기 위한 기초적 연구로서 표층처리공법 지지력 산정방법을 제안하는 것을 목적으로 하고 있다. 이를 위하여 직포, 지오그리드, 강봉(대나무 대채재료)을 이용한 보강재의 단부 구속조건을 완전구속, 부분구속(3종류)으로 한 21 종류의 실내모형실험을 수행하였다. 또한 실험결과를 이용해 보강재의 강성도가 지지력효과에 미치는 영향을 고려한 지지력 산정방법을 제안하였다. 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 21 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. Moreover, a new procedure was proposed to take into account the effect of the stiffness of Reinforce materials on bearing capacity theory of Surface Reinforcement Method for Soft Ground.
보강재의 구속조건에 따른 초연약지반의 지지력개선효과에 관한 연구
함태규(Ham Tae-Gew),조삼덕(Cho Sam-Deok),양기석(Yang Kee-Sok),유승경(Yoo Seung-Kyong) 한국토목섬유학회 2008 한국지반신소재학회 논문집 Vol.7 No.3
본 연구에서는 지지력개선효과에 미치는 보강재의 구속조건의 영향을 평가하기 위하여 보강재의 재료특성이 서로 다른 직포, 지오그리드, 강봉을 이용하여 보강재의 단부 구속조건을 달리한 실내모형실험을 수행하였다. 실내 모형실험 결과, 보강재의 강성도 증가에 따라 BCR값도 함께 증가되는 선형적인 관계가 확인되었고, 단부 구속응력이 T=85.6㎏까지는 단부 구속응력의 증가에 따른 보강재와 점토지반사이의 마찰력의 증가로 인해 BCR값이 증가되는 것으로 평가되었다. 또한 보강재가 수평면과 이루는 경사각 θ에 있어 직포는 38˚~50˚. 지오그리드A는 45˚~50˚, 강봉은 14˚~16˚인 것으로 평가되었고, 융기망의 반경 r(m)은 직포가 0.6m~0.7m, 지오그리드가 .5m~0.8m, 강봉이 2.4m~3.0m로 강성재료인 강봉은 비강성 재료인 직포의 약 4배에 해당하는 것으로 평가되었다. This study was carried out the model experiment in laboratory to evaluate the bearing capacity improvement of soft ground as altered constraint condition of reinforcements according to geotextile, georid, steel bar. As a results, the value of BCR was increased linearly as improvement of the stiffness of reinforcements, and the factor governed the increasement of BCR was the increasement of frictions between reinforcement and clay as far as the constrain conditions increased until T=85.6㎏. Moreover, 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 0.5m 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.
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.