• Title, Summary, Keyword: 지오그리드

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Experimental Study on the Reinforcement Effect of Geogrid in Soft Ground Improvement (연약지반 개량시 지오그리드 보강효과에 관한 실험적 연구)

  • Ham, Hyeon-Su;Lee, Sang Duk
    • Journal of the Korean Geosynthetics Society
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    • v.17 no.2
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    • pp.1-7
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    • 2018
  • The number of construction of roads and railroads in soft ground such as coastal areas and wetlands is getting increased. For this reason cases that soft ground improvement is applied are increasing. In general, many ground improvement methods consider only the working conditions at the time or only economy. But if the working condition and economy are taken into consideration together, the number of applicable construction method gets limited. In such a case, a ground improvement method using both the surface layer portion and the deep layer portion is applied. But the basic research on this is still insufficient in practice. Therefore, in this study the reinforcement effect of geogrid was investigated by carrying out the model test realizing the case in which soft surface ground improvement and depth improvement are simultaneously applied. And it was intened to understand the effect of the thickness of surface layer, the diameter and length of the improvement body on the reinforcement effect of geogrid. The result showed that the effect of the surface layer thickness is greater than the effect of the deep layer diameter. Moreover, when the surface layer is reinforced with a geogrid, the strength of the surface layer part is enhanced and this effect of a geogrid reinforcement caused the reduction of surface settlement.

A Study on the Application of Numerical Model to Predict Behaviour of EPS (EPS 거동 예측 모델의 적용성에 대한 연구)

  • Cheon, Byeong-Sik;Yu, Han-Gyu;Im, Hae-Sik
    • Geotechnical Engineering
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    • v.12 no.6
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    • pp.185-198
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    • 1996
  • EPS is increasingly used as a filling material in soft ground. The beneficial effects of the use of EPS derive from minimizing the stress increment, which, in turn, increases the bearing capacity and reduces the settlement. EPS can also be used as a backfill material for retaining walls and abutments to reduce the horizontal earth pressure. However, there is no rational application for the selection of the EPS fill which is essential to the selection of the filling configuration and the settlement calculation. In this paper, therefore, the nonlinear numerical model developed from the results of triaxial compression tests is applied to the construction of EPS and verified through the comparison between the prediction and in-situ measurements.

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Behavior Characteristics of Composite Reinforced Earth with Improved Soil Surface and Geogrid-reinforced Backfill (지반개량재 전면토체와 지오그리드 보강 배면토체로 형성된 복합보강토의 거동특성)

  • Bhang, In-Hwang;Kim, Tae-Heon;Kim, You-Seong;Kim, Jae-Hong
    • Journal of the Korean Geoenvironmental Society
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    • v.17 no.12
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    • pp.27-34
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    • 2016
  • Many steepened slopes have become increasingly advantageous because of the desire to increase land usage and decrease site development costs. The proven concept of tensile reinforcement allows construction of slopes with far steeper face angles than the soils natural angle. Steepened slope face reinforced with improved soil can increase land usage substantially while providing a natural appearance. The paper presents composite reinforced earth with improved soil surface and geogrid-reinforced backfill. For the stability of the steepened slope, the behavior of the composite reinforced earth are validated and verified by case study and numerical analysis. The case study has performed to investigate the deformation of reinforce soil slope for 14 months. Its horizontal behavior by general vertical load shows within the safe range (0.5% of structure height). As a result of numerical analysis and case study, the reinforcement effect of the steepened slope technique using improved soil is sufficient to be constructed as reinforced soil slope.

Bearing Capacity of Shallow Foundation on Geogrid-Reinforced Clay (지오그리드로 보강된 점성토사의 얕은 기초의 지지력)

  • Shin, Bang Woong;Das, Braja M.;Shin, Eun Chul;Chung, Kee Taek
    • Journal of The Korean Society of Civil Engineers
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    • v.14 no.6
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    • pp.1439-1444
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    • 1994
  • Laboratory model test results for the ultimate bearing capacity and allowable bearing capacity at various settlement levels conducted on a strip foundation supported by geogrid-reinforced clay soil have been presented. For mobilization of the maximum possible load-carrying capacity, the optimum width and depth of the reinforcement layers, and the location of the first layer of reinforcement with respect to the bottom of the foundation have been determined.

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Strength Evaluation of I-Type Connecting System on a Segmental Retaining Reinforced Wall Consideration the Backfill Settlement (배면침하 영향을 고려한 보강토 옹벽의 I형 연결시스템 강도 평가)

  • Moon, Hee-Jung;Han, Jung-Geun;Lee, Jong-Young;Cho, Sam-Deok;Lee, Kwang-Wu
    • Journal of the Korean Geosynthetics Society
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    • v.6 no.1
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    • pp.27-32
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    • 2007
  • This paper describes the applicability of geogrid with I-type coupling system, which permits vertical displacement on back fill ground of the reinforced retaining wall and also minimize the damage between block and geogrid. The improvement of coupling method allowed the reduction of approximately 700 mm in the existing geogrid, and as a result, the tensile strength at the coupling joint showed approximately 53% of the maximum tensile strength. It is expected from the laboratory investigations that the coupling strength of geogrid with the combination of in-situ supporting material should be predominant in the field condition.

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A Study on the Lateral Earthpressure at Behind Structure for Backfill by Sand (구조물 배면에 사질토 되메움시 유발되는 수평토압에 관한연구)

  • Lee, Sang-Duk;Kang, Se-Gu
    • Journal of the Korean Geosynthetics Society
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    • v.10 no.4
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    • pp.11-18
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    • 2011
  • In this study, the reinforcing effect of geogrids in the narrow backfill by sand was experimentally studied. In the model tests, the size of space and the slope of the cut off slope were varied out. The resultant and the distribution of lateral earth pressure were measured. Width of backfill space varied 10 cm, 20 cm, 30 cm at the lower wall level and angle of the cut off slope varied $90^{\circ}$, $75^{\circ}$, $60^{\circ}$. Geogrids were installed in the backfill. Measured results showed that the distribution of the lateral earth pressure due to the narrow backfill developed in a arching shape. And the earth pressure was reduced due to the reinforcement of the backfill by geogrid. geogrid helps reduction of lateral earth pressure.

Evaluation of Long-Term Performance of Composite Geotextiles for Reinforcement (보강용 복합 지오텍스타일의 장기성능 평가)

  • Jeon, Han-Yong;Ryu, Jung-Jae;Lee, Su-Nam;An, Yang-Nim;Cho, Bong-Gyun
    • Journal of the Korean Geosynthetics Society
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    • v.2 no.2
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    • pp.33-38
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    • 2003
  • Polyester woven geotextiles to be bonded with nonwovens were manufactured for reinforcement and the allowable strength of these were obtained by the results of creep tests. Long-term design strength were calculated in consideration with factors of safety for design and construction and the long-term behaviors of geogrids were compared to those of composite woven geotextiles to examine the reinforcement function. From the experimental results, it was confirmed that these woven composite geotextiles could have the sufficient performance as an alternative geosynthetics instead of geogrids and the further study will be continue to confirm the possibility of woven composite geotextiles as the excellent reinforcing material.

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