• Title/Summary/Keyword: 섬유보강토

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Friction Features of Geosynthetics Through the Pullout Test (인발실험을 통한 토목섬유의 마찰특성 평가)

  • Shin, Eun-Chul;Yun, Sock-Ho
    • Journal of the Korean Geosynthetics Society
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    • v.2 no.1
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    • pp.3-13
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    • 2003
  • Recently, construction of the reinforced earth structures, which adopts reinforcing materials of geosynthetic, is rapidly increasing due to its good economic advantages, beautiful appearance, and convenient construction. Nonetheless, the most important factor of interpretation and design of the reinforced earth structures, which is assessment ways of friction features between earth and geosynthetic, has not been standardized yet. It has great difference of interpretation and design methods which suggested to the design engineer. This study is to present the way how to assess more reasonably friction features between geogrid and weathered granite soil through the pullout test. Based on a large-scale pullout test of geogrid, the maximum shear stress, interface fricton angle, and friction efficiency are presented with consideration of various test condition.

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Wall Retaining Geosynthetic의 크리이프 특성평가

  • 전한용;김정효;조성호;차동환
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.10a
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    • pp.348-351
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    • 1998
  • 토목 및 건설용으로 사용되는 토목섬유 중 지오그리드는 경사와 위사 방향으로 10~100mm 크기의 aperture가 형성된 격자 구조를 갖는 것을 지칭하며 1980년대에 개발되어 토목공사에 적용되어 왔으며, 강도가 요구되는 방향으로 높은 인장강도를 지님으로써 도로의 기초 지반과 포장층의 보강, 제방과 사면의 보강 및 보강토 옹벽공사용 둥에 사용되고 있다. (중략)

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A Study on the Collapse Reason by Slope Stability Analysis Considering Construction Stages (시공단계를 고려한 비탈면의 안정성 검토를 통한 비탈면 활동원인 연구)

  • Byun, Yoseph;Jang, Hyeonkil;Jung, Kyoungsik;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.8
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    • pp.25-31
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    • 2011
  • In recent rainy seasons, severe rain storms have caused frequent reinforced retaining wall collapses and slope sliding which have lead to casualties. In this paper, investigating cases of reinforced retaining wall failure, the causes of cracks in reinforced retaining wall and slope sliding have been examined, and a finite element analysis considering the construction phase has been done to analyze the cause and characteristics of slope sliding. As a result, reinforced retaining wall displacement has increased due to heavy rain storms and the increase size has been shown to be large. From these results, it has been analyzed that pile driving can have an effect on the collapse of reinforced retaining walls.

Evaluation of Lateral Deformation and Vertical Stress of Geosynthetics Reinforced Walls by the Scale Model Test (축소모형실험을 통한 토목섬유 보강토옹벽의 수평변위 및 수직응력 평가)

  • Cho, Sam-Deok;Lee, Kwang-Wu;You, Seung-Kyong
    • Journal of the Korean Geosynthetics Society
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    • v.16 no.4
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    • pp.119-127
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    • 2017
  • This paper presents a study of reinforced earth model wall reinforced by geosynthetics subjected to vertical surcharge. 7 types of reinforced earth model wall were constructed in the model box($100cm{\times}140cm{\times}100cm$) to assess the deformation and stress behavior of model walls according to different tensile strength and laying number of reinforcement and surcharge pressures. 3 types of geosynthetics that have different tensile strength were used as reinforcement. The test was carried out by changing the number of reinforcement to 5, 7, 9, and surcharge pressure to 50, 100, 150, 200, 250 kPa. The model test found that the maximum lateral displacements occurred at the 0.7 H (H : Wall height) position from the bottom of the model wall and vertical stress was low in the smaller surcharge pressure and the larger tensile strength of reinforcement.

Long-Term Behavior of Geogrid Reinforced Soil Abutment - A Numerical Investigation (지오그리드 보강토 교대의 장기거동에 관한 수치해석 연구)

  • Yoo, Chung-Sik;Jeon, Han-Yong
    • Journal of the Korean Geotechnical Society
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    • v.27 no.1
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    • pp.65-76
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    • 2011
  • This paper presents the results of a numerical investigation on the long-term behavior of geosynthetic reinforced soil abutment. The investigation was carried out aiming at identifying the governing mechanisms of the long-term deformation of geosynthetic-reinforced soil abutment subjected to sustained loads during service life. A numerical modeling strategy was first established using the Singh-Mitchell creep model and the power law model, respectively, for the backfill and the geosyntehtic reinforcement. A parametric study on the creep properties of the backfill and the geosynthetic reinforcement was then conducted. The results indicated that a geosynthetic reinforced soil structure backfilled with marginal soil may exhibit substantial long-term deformation due to the creep effects caused by both the backfill soil and the geosynthetic reinforcement, the magnitude of which depends largely on the creep properties. This paper highlights the importance of considering the creep effect on load supporting geosynthetic reinforced soil structures when the long-term serviceability requirement is of prime importance.

Pre-stress Effect of Geosynthetics-reinforced Soil Structure (토목섬유로 보강된 구조물의 프리스트레스효과)

  • Kim Eun-Ra;Kang Ho-Keun
    • Journal of the Korean Geotechnical Society
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    • v.21 no.6
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    • pp.53-65
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    • 2005
  • This paper presented a mechanism of the soil structure reinforced by geosynthetics, in which the reinforcing mechanism is treated as the effect arising from the reinforcement process to prevent the dilative deformation of soil under shearing. A full-scale in-situ model test was carried out by introducing the prestress method to enhance the geosynthetic-reinforcement, and the prestress effect through the FEM is also examined. The elasto-plastic model and the initial parameters needed in the FEM are presented. Moreover, the theoretical prediction is compared with the experimental results, which were obtained by a full-scale in-situ model test.

Evaluation on Stability of Reinforced Earth Wall using Geosynthetic Strip with Rounded Band Anchor (띠형 섬유보강재가 적용된 블록식 보강토옹벽의 안정성 평가)

  • Lee, Kwang-Wu;Cho, Sam-Deok;Han, Jung-Geun;Hong, Ki-Kwon
    • Journal of the Korean Geosynthetics Society
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    • v.11 no.3
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    • pp.43-51
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    • 2012
  • This paper describes the stability evaluation of reinforced earth wall using geosynthetic strip based on field test. The wall facing, which is applied in field, is able to present excellent scenery, and the reinforcement has improvement effect of pullout resistance based on rounded band anchor. The measurement is conducted according to construction elapsed time of structure for earth pressure, horizontal displacement of wall facing and reinforcement strain in field test. The evaluation results show that the measured earth pressure is less than theoretical earth pressure due to dispersion effect of earth pressure by geosynthetic strip. The horizontal displacement of wall facing is also satisfied a empirical criteria. The measured strain of reinforcement had nearly no effect on stability of the reinforced earth wall. Therefore, the geosynthetic strip with rounded band anchor can be applied in the reinforced earth wall, and the reinforced earth wall with geosynthetic strip can be commonly used in field because it has a structural stability.

Unconfined Compressive Strength Characteristics of Eco-Friendly Stabilizers and Carbon Fiber Reinforced Soil (친환경고화재와 탄소섬유 보강토의 일축압축강도 특성)

  • Sewook Oh;Sunghwan Yang;Hongseok Kim
    • Journal of the Korean GEO-environmental Society
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    • v.25 no.8
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    • pp.13-19
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    • 2024
  • In this study, to reinforce the surface layer of weathered soil slopes where erosion and collapse of surface layer occur, compression strength tests were conducted by mixing carbon fiber and eco-friendly stabilizer (E.S.B.) To determine the optimal mixing ratio of E.S.B. and carbon fiber, E.S.B. was set at conditions of 10%, 20%, and 30%, and carbon fiber at 0.3%, 0.6%, 0.9%, and 1.2%. Additionally, to analyze the changes in compressive strength according to dry density and curing period, 85% and 95% of the maximum dry unit weight were applied, and curing periods were set to 3 days, 7 days, and 28 days. The standard strength for surface layer reinforcement of slopes is proposed as 4 MPa at 7 days and 6 MPa at 28 days according to ACI 230.1R-09 (2009). The compression test results showed that the unconfined compressive strength of E.S.B. reinforced soil met the standard strength at an E.S.B. mixing ratio of 10% or more for 95% compaction. Moreover, when carbon fiber was mixed with E.S.B. reinforced soil, a ductile fracture pattern was observed after the yield point due to compressive strength, indicating that the mixture could compensate for post-yield failure. It was analyzed that the maximum strength is exhibited at a carbon fiber mixing ratio of 0.6%. The unconfined compressive strength of carbon fiber reinforced soil increases by approximately 54-70% compared to the condition without carbon fiber.

Case Study on Global Slope Failure Case of Segmental Retaining Wall (블록식보강토옹벽의 전면 사면붕괴 사례연구)

  • Han, Jung-Geun;Cho, Sam-Deok;Jeong, Sang-Seom;Lee, Kwang-Wo;Hong, Ki-Kwon
    • Journal of the Korean Geosynthetics Society
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    • v.4 no.2
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    • pp.47-56
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    • 2005
  • Recently, geosynthetic reinforced earth walls are gradually replacing conventional concrete retaining walls for reasons of economy, expediency of construction, and aesthetics. A number of reinforced soil walls having more than 10m heights have been constructed to make more effective development in the country. However, mistakes in design and construction of reinforced earth walls have resulted in many troubles such as failure of reinforced earth walls, horizontal deformationor breakdown of facings, and so forth during or after construction. In this paper, a case study on global sliding failure of a geogrid-reinforced tiered wall is carried out to investigate the causes of the failure and suggest the proper countermeasures. From the subsurface investigation and field instrumentation, It is found that the cause of the global sliding failure was occurred by decreasing of bearing capacity of foundation ground induced by infiltration of rainwater.

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