• Title/Summary/Keyword: 보강성토

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An Experimental Verification on the Efficiency of Geosynthetics on Crushed Stone Layer (쇄석배수층에 적용된 토목섬유의 효율성에 대한 실험적 검증)

  • Park, Min-Cheol;Im, Eun-Sang;Kim, Jae-Hong;Han, Heui-Soo
    • Journal of the Korean Geotechnical Society
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    • v.29 no.11
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    • pp.17-27
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    • 2013
  • This study is to prove the efficiency of geo-synthetics on the crushed stone layer by experiments. The strength of PET mat as reinforcing soft ground was verified through the loading experiments. Also, PP mat was used to protect the blockage of crushed stone layer by the filled soil, whose efficiency was examined according to loading and infiltration conditions. The crushed stones were penetrated into clay layer if the PET mat was removed, which was verified by loading experiments. In addition, the cohesioness of soil without PP mat made the blockage of stone layer easily, which reduced the infiltration capacity by about 98%.

The Stability of Bridge Abutment Reinforced by Pile-slab on Soft Ground Undergoing Lateral Flow (측방유동 연약지반상 파일슬래브로 보강된 교대의 안정)

  • Hong, Won-Pyo;Song, Young-Suk
    • Journal of the Korean Geotechnical Society
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    • v.22 no.8
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    • pp.13-24
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    • 2006
  • A site investigation has been performed for bridge abutments constructed on soft ground, which are deformed laterally by backfill. As the result from the evaluation of lateral movement in bridge abutment, the foundation piles were not considered as the passive pile at the design stage and the period for soft ground improvement was not proper. In order to prevent lateral movement of bridge abutment, the pile slab is proposed as a countermeasure. This method can effectively prevent the lateral flow of soft ground, since the overburden surcharge due to backfill on soft ground would be effectively delivered to bedrock through the piles in soft ground. The instrumentation system is designed and installed to investigate the behavior of bridge abutment on soft ground reinforced by pile slab. The instrumentation results show that pile slab effectively resists to the lateral movement of bridge abutment due to backfill. Also, the surcharge loads due to backfill are transmitted to the bedrock through piles. It confirms that the pile slab effectively resists to the lateral movement of bridge abutment due to backfill and the applied design method is reasonable.

Load Carrying Capacity and Failure Mechanism of Geogrid Reinforced Stone Columns : Reduced-Scale Model Tests (지오그리드 보강 Stone Column의 파괴메카니즘 및 지지력 특성 - 축소모형실험을 통한 고찰)

  • Lee, Dae-Young;Song, Ah-Ran;Yoo, Chung-Sik
    • Journal of the Korean Geotechnical Society
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    • v.22 no.10
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    • pp.121-129
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    • 2006
  • Stone column is one of the ground improvement systems which is being used for accelerating consolidation and increasing bearing capacity for settlement sensitive structures like load embankments, bridge abutments, oil storage tanks etc. The effects of this method are enhancement of ground bearing capacity, reduction of settlement, prevention of liquefaction and prevention of lateral ground movement. Recently, geosynthetic reinforced (encased) stone column approach has been developed to improve its load carrying capacity through increasing confinement effect. Although such a concept has successfully been applied in practice, fundamentals of the method have not been fully explored. This paper presents the results of an investigation on the bearing capacity and failure mechanism of geogrid-encased stone column by model tests. The results of the analyses indicated improved bearing capacity of the geogrid reinforced stone column method over the conventional strone column method with no encasing.

Dynamic Deformation Characteristics of Fiber Reinforced Soils with Various Gradation (여러 가지 입도분포를 갖는 섬유혼합토의 동적변형특성)

  • Mok, Young-Jin;Jung, Sung-Yong;Park, Chul-Soo
    • International Journal of Highway Engineering
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    • v.7 no.1 s.23
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    • pp.39-47
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    • 2005
  • Fiber reinforced soils have recently implemented to fills and base layers of highways and railroads, and deformation behaviors of reinforced soils in turn should be investigated. The paper evaluated deformation characteristics of fiber reinforced sands and their effectiveness of reinforcement using resonant column tests. The specimens were prepared by varying gradation and mixing polypropylene staple fibers of 0.3% fiber content. Maximum shear moduli of reinforced sands were increased by up to 30% with increasing uniformity coefficient. Shear moduli of well-graded reinforced sands were larger than those of poorly-graded ones regardless of confining pressure in the whole range of shearing strain and reinforcement was, in turn, more effective with higher uniformity coefficient.

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A Study on the Behavior of Soft Clay Foundation Reinforced with Soil Cement Piles by Centrifugal Model Tests (원심모형실험에 의한 시멘트 개량말뚝으로 보강된 연약점토지반의 거동에 관한 연구)

  • Lee, Cheo-Keun;Shin, Bang-Woong;Heo, Yol;Ahn, Sang-Ro
    • Geotechnical Engineering
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    • v.10 no.2
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    • pp.109-120
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    • 1994
  • One of problems being faced during construction of soil structures along the coastal regions is the stabilization of soft clay foundation, In this study, centrifugal model bests were conducted to investigate behavior effect of soft foundation reinforced by cement -soil piles for the stabilization of softs clay foundation during the embankment construction. This paper presents results of settlement and heaving behavior of reinforced and unreinforced foundation with time under the swaged loading for different best conditions. The test results have shown that the reductions of vertical settlement of the foundation and heaving of the ground surface adjacent to the embankment are greatly influenced by strength of improved pile, and moisture content, and especially the ratio of replacement area.

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Stability of Tunnel under Shallow Overburden and Poor Rock Conditions Using Numerical Simulations (수치해석적 방법을 통한 저토피 및 암질불량구간의 터널 안정성 검토)

  • Kim, Jungkuk;Kim, Heesu;Ban, Hoki;Kim, Donggyou
    • Journal of the Korean GEO-environmental Society
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    • v.22 no.11
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    • pp.39-47
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    • 2021
  • Tunneling is widely increased in rail-road construction due to the large portion of mountainous regions in Korea as well as the improving running performance of train. Tunneling under poor rock condition, shallow overburden, or existing fault zone has high risk for collapse. Therefore, this study presents the stability of tunnel under unfavorable geological conditions using finite element methods.

A Study on Interaction Behaviors of Soil-PET Mat installed on Dredged Soils (연약한 준설점토상 매립시 포설된 PET 매트와 지반거동에 관한 연구)

  • Lee Man-Soo;Jee Sung-Hyun;Yang Tae-Seon
    • Journal of the Korean Geotechnical Society
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    • v.22 no.3
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    • pp.13-21
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    • 2006
  • Geosynthetic damage has attracted a major attention since the introduction of geotextiles for civil engineering applications. In this study 3 pilot trial embankments were carried out to investigate the behaviours of reinforced embankments over soft cohesive soils and to find the optimum methodology of embankments over soft soils. As the seamed part of polyester mat (PET, tensile strength 15 ton) used in the first full-scale field test was ruptured under progressing rotational slope failure because of unexpectedly rapid construction of embankments, the excessive pore water pressures were measured. On the soil behavior where tension explosion of mat was continued, pore pressure larger than the one caused by embankment height was measured. Especially, at the depth of 5.0 m under the ground pore pressure increased over long term. It was discussed with respect to the height of embankment and heaving behavior of soft soils.

The Reinforcement Effect of Woven Geotextiles for Railway Roadbed High-Embankment on Soft Ground by the Limit Equilibrium Analysis (한계평형해석에 의한 연약지반 위의 철도노반 고성토를 위한 직포 보강 효과)

  • Kim, You-Seong;Choi, Jae-Seon
    • Journal of the Korean Geosynthetics Society
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    • v.9 no.4
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    • pp.27-37
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    • 2010
  • Woven geotextiles (polyester mats) reinforcement is generally used to improve traffic ability, bearing capacity, and slope stability for embankment construction on soft ground. Cases of two high-strength woven geotextiles reinforcement layers are introduced in the present paper, which has been successfully constructed for rail road embankment on soft ground. According to the case results based on the limit equilibrium analyses of slope stability, the two high-strength woven geotextiles reinforcement layers on the soft ground can substantially increase the stability of the embankment by about 25%, improve the safety factor from 0.91 to 1.14, and significantly reduce the embankment construction duration at least 2 months. Therefore, the application of high-strength woven geotextiles is found to be useful for in-situ cases having the lack of construction duration and stability, as a soft ground improvement.

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Development of a Computer Program to Analyze Stability of Slopes Reinforced by the Earth Retention System (활동억지시스템으로 보강된 사면의 안정해석 프로그램 개발)

  • Hong Won-Pyo;Song Young-Suk
    • The Journal of Engineering Geology
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    • v.16 no.1 s.47
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    • pp.45-58
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    • 2006
  • A new computer program SLOPILE(Ver 3.0) is developed to analyze stability of slopes containing an earth retention system composing of piles, nails and anchors. SLOPILE(Ver 3.0) can calculate the slope stability for both planar failure surfaces in infinite slopes and arc failure surfaces. In order to investigate a design adaptability of SLOPILE(Ver 3.0), analysis results of TALREN and SLOPE/W programs are compared with that of SLOPILE(Ver 3.0). SLOPILE(Ver 3.0) can calculate the slopes reinforced by earth retention system such as piles, nails and anchors. But, TALREN and SLOPE/W can not calculate the slope reinforced by piles. As a analysis result of the example case, SLOPILE(Ver 3.0) is accuracy and suitable program for the stability analysis of slopes reinforced by earth retention system. Therefore, SLOPILE(Ver 3.0) is the most suitable program to analyze the slope reinforced by the earth retention system.

Geotechnical treatment for the fault and shattered zones under core foundation of fill dam (단층 및 파쇄대가 분포하는 Fill Dam 기초의 보강대책)

  • 김연중;최명달
    • The Journal of Engineering Geology
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    • v.2 no.1
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    • pp.19-35
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    • 1992
  • aThe elastic properties of the fault zone (width; 3~12m), the shattered zone (width; over 40m) and the fresh rock zone distributed under the core foundation of fill dam in granitic gneiss have widely different range. The deformation moduli of the fresh rock zone, the fault zone and the shattered zone obtained from in situ rock tests - Plate Load Test and Bore Hole Deformation Test - show a range of $42,000~168,000kg/\textrm{cm}^2,{\;}963~2,204kg/\textrm{cm}^2{\;}and{\;}1,238~2,098kg/\textrm{cm}^2$, respectively. The differential settlements hetween the fault zone and the fresh rock zone are expected after the dam construction. Therefore, the displacement of foundation and concrete fill are evaluated using FEADAM 84 program of finite element analysis. The geometric distribution of discontinuifies obtained from the site mapping and drilling is considered in the finite element analysis. The analysis shows that the differential settlements between the fault zone and the fresh rock zone is about 6cm, while that of concrete fill is within 0.5cm.

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