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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.
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.
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.
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.
다짐재료의 이방성을 고려한 전단강도 추정방법에 관한 연구
함태규(Ham Tae-Gew) 대한토목학회 2008 대한토목학회논문집 C Vol.28 No.5
본 연구에서는 다짐 재료의 강도특성에 나타나는 이방성과 그 정도를 명확히 밝히기 위해 다짐 재료로 널리 사용되는 화강풍화토를 이용해 포화, 불포화 상태에서 삼축압축시험을 실시했다. 공시체는 다짐도 D<SUB>c</SUB>=90%가 되도록 다짐한 후 σ₁ 방향과 퇴적면이 이루는 각도로 정의되는 δ가 0°, 45°, 90°가 되도록 제작되었다. 실험결과, 불포화토의 전단강도에 미치는 흡입력(sue디on}의 기여율에는 δ의존성이 확인되지 않았고, 다짐재료의 전단강도에 나타나는 이방성은 포화시보다 불포화시에 현저히 나타나는 것으로 평가되었다. 또한 실험을 통해 도출된 결과를 이용해, σ₁방향과 퇴적면과 이루는 각도 δ가 서로 다른 불포화토의 전단강도를 간단히 추정할 수 있는 방법을 제안하였다. In order to investigate the strength anisotropy of compacted materials, a series of unsaturated and saturated-drained triaxial compression tests was performed. Three different orientation angles of the axial direction of samples with respect to the horizontal plane were investigated: δ=0, 45 and 90 degrees. As the results showed, the suction rate on the strength of the unsaturated specimen was not influenced by δ. And the effect of the angle δ on the strength was more pronounced on unsaturated specimen as compared to saturated specimen. Moreover, a new procedure was proposed to take into account the effect of the angle δ on the shear strength of unsaturated soils.