• Title, Summary, Keyword: 지오그리드

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Site Monitoring of the Retaining Wall Reinforced by Geogrids with Block Type Facings (지오그리드 보강토 옹벽의 계측평가)

  • Kim, Jin-Man;Lee, Dae-Young;Ma, Sang-Joon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.1
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    • pp.106-114
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    • 2006
  • Uses of geosynthetics as a reinforcing material for earth structures have ever increased due to their excellent economy. fine external appearance. and easy construction. In the current practice of geosynthetics. however, the lacks of the standardized method of evaluating the soil/geosynthetics friction properties and the inconsistency of conventional design methods develop confusion to the civil engineers. The purpose of site monitoring of the retaining wall reinforced by geogrids was to evaluate the applicability of existing design methods to, and performance of. CHAMSTONE wall system. Full scale field performance during and after construction was monitored by incorporating instrumentation including strain gauges on the geogrid and soil pressure cells. The difference of the reinforcing effects of geosynthetics embedded in the soil will be also investigated by comparing of the line and curve types of retaining wall reinforced by geogrids with block type facings.

Ultimate Bearing Capacity of Strip Foundation on Geogrid -Reinforced Clayey Soil

  • Shin, Eun-Chul;Choi, Chan-Yong
    • Geotechnical Engineering
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    • v.13 no.3
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    • pp.77-86
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    • 1997
  • Laboratory model test results for the ultimate bearing capacity of a surface strip foundation supported by a near-saturated clayey soil reinforced with layers of geogrid have been presented. The optimum values for the width of the reinforcement layers, the depth of reinforcement, and the location of the first layer of geogrid for mobilization of maximum bearing capacity have been determined. Based on the model test results, an empirical procedure to estimate the ultimate bearing capacity has been developed.

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Stability Analysis of Road Embankment Reinforced by Geogrid (지오그리드로 보강된 도로제방 사면의 안정성 해석)

  • Lee, Han-Min;Yoo, Han-Kyu;Suh, Young-Chan;Park, Un-Sang
    • Journal of the Korean Geoenvironmental Society
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    • v.2 no.4
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    • pp.39-50
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    • 2001
  • In this study, in order to investigate the effects of reinforcement length and vertical spacing on the factor of safety, the road embankment reinforced by geogrid was analyzed using RSS(Reinforced Slope Stability) program based on limit equilibrium analysis. The result by computer analysis showed that the factor of safety for reinforced slope increased with increasing length of reinforcement and with decreasing vertical spacing of reinforcement up to certain limit. Also, numerical analysis by FLAC was performed on reinforced slope to evaluate the horizontal displacement, horizontal stress, and distribution of tensile forces of reinforcements in the cases of several reinforcement length. The results of analysis showed that the critical failure mode was toe failure or slope failure and the effect by the additional reinforcement length on the slope stability was negligible under stabilized condition.

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A Study on the Deformation Behavior of Nonwoven Geotextiles Reinforced Soil Walls Based on Literature Reviews (문헌조사에 근거한 부직포 보강토옹벽의 거동에 관한 연구)

  • Won, Myoung-Soo;Kim, Tae-Wan;Roh, Jae-Kune;Kim, Hyoung-Wan
    • Journal of the Korean Geosynthetics Society
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    • v.9 no.1
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    • pp.21-30
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    • 2010
  • To understand the deformation behavior of nonwoven geotextiles(NWGT) reinforced soil wall, analyses of load-elongation properties, soil-reinforcement interface friction, laboratory model tests, and field cases throughout literature reviews are being studied in this paper. According to the analyses results, the stiffness and tensile strength of NWGT is increased in proportion to confinement pressures, and the interface shear strength at soil-NWGT appeared to be stronger than soil-geogrid interface. The deformation at the beginning of loading on NWGT reinforced soil wall is larger than geogrid reinforced soil wall, but the wall deformation with NWGT is smaller than the wall of geogrid after passing some loading point in laboratory model tests. Case analysis results have shown that the facing of NWGT reinforced soil wall should be rigid enough to be used as a permanent wall, and NWGT and in-situ poor soil can be used for reinforcement and backfill respectively if the wall is constructed as pre-reinforced soil body and with post-facing that has a full-height rigid concrete.

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Finite Element Modeling of Geogrid-encased Stone Columns in Soft Clay (지오그리드 보강 쇄석 말뚝 공법의 유한요소해석 모델링)

  • Yoo, Chung-Sik;Song, Ah-Ran;Lee, Dae-Young;Kim, Sun-Bin;Park, Si-Sam
    • Journal of the Korean Geosynthetics Society
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    • v.6 no.1
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    • pp.17-25
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    • 2007
  • This study presents a modeling approach for geogrid-encased stone column(GESC) method which is widely used in Europe as an alternative to conventional pile foundations. Several benefits of using the stone column method include sound performance, low cost, expediency of construction, and liquefaction resistance, among others. Recently, geosynthetic-encased stone column approach has been developed to improve load carrying capacity through increasing confinement effect. The aim of this research is to establish a systematic approach for modeling of GESC and to form a database for the fundamentals of GESC. This paper presents details of 3D modeling of GESC together with the general behavior of GESC.

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Time-dependent Deformation Charateristics of Geogrid Using Wide Width Tensile Test (광폭인장시험을 통한 지오그리드의 시간의존적 변형 거동 고찰)

  • Yoo, Chung-Sik;Jeon, Han-Yong;Kim, Sun-Bin
    • Journal of the Korean Geotechnical Society
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    • v.24 no.1
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    • pp.71-80
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    • 2008
  • This paper presents the reusults of wide width tensile tests under sustained and cyclic loads with vairous loading rate on geogrids. A seires of modified wide width tensile tests were conducted to investigate the effect of tensile strain rate on the deformation behavior of the geogrids. In addition, residual deformation characteristics of a geogrid under sustained or cyclic tests were also investigated. The results indicated that the residual deformation of a geogrid is strongly related to the viscous behavior of the geogrid, and the residual deformation can be well described by a hyperbolic curve. Also revealed was that residual deformation of a geogrid when subject to sustained or cyclic load should be described with the framework of viscous behavior.

Load Carrying Capacity of Geosynthetic Reinforced Railway Subgrade Under Cyclic Load (토목섬유 보강재로 보강된 철도 노반의 반복하중 하중지지력 연구)

  • Hong, SeungRok;Cho, Yungyu;Choi, JungHyuk;Jeong, Yongjun;Yoo, ChungSik
    • Journal of the Korean Geosynthetics Society
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    • v.12 no.4
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    • pp.109-121
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    • 2013
  • This paper studied the characteristics of bearing capacity of railway reinforced with geosynthetic against repetitive loading of train. The railway that was based on the porous pavement substructure ground and reinforced with geosynthetic was copied. In order to analyze load carrying capacity of geosynthetic, we have had 3cases experiments - in the first case, the ground was non reinforced, second case was reinforced geocell and last case was reinforced geogrid - and all of them were reduced-scale laboratory tests. The results of the analyses indicated that the bearing capacity of the reinforced geogrid increases much more than the reinforced geocell. Residual deformation of the initial cyclic load was larger than the secondary cyclic loads.

An experimental study on the improvement of tunnel drainage system using a geogrid composite (지오그리드 복합 배수재를 이용한 터널 배수성능 개선에 관한 실험적 연구)

  • Lee, Jun S.;Choi, Il-yoon;Lim, Jihoon;Yoon, Suk Chul
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.18 no.1
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    • pp.31-40
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    • 2016
  • A new testing equipment is designed to investigate the characteristics of the drainage fabric which is used in the tunnel drain system. The equipment is possible to model the loading as well as boundary conditions of the shotcrete precisely and it follows the general guideline of ASTM D4716 so that the interface between shotcrete and concrete lining retains the real situation in the tunnel site. Using the real loading conditions and surface irregularities, the flow rate and its capacity of the regular fabric has been estimated. A composite drainage fabric having geogrid inside was also used to investigate the flow rate and its efficiency. The advantages of the composite fabric compared with the regular one have been demonstrated using the experimental data and brief outline of the future work is finally proposed.