• Title/Summary/Keyword: Geosynthetic

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Confining Effect due to Geosynthetics Wrapping Compacted Soil Specimen (geosynthetics로 보강된 다짐토 공시체의 구속효과)

  • Kim, Eun-Ra;Iizuka, Atsushi;Kim, You-Seong;Park, Hong
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.348-355
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    • 2004
  • 본 연구에서는 geosynthetics로 보강된 다짐토의 보강 메카니즘을 파악하기 위한 목적으로 실내시험 및 수치계산 수행하였다. 본 연구에서 고려하는 보강 메카니즘은 전단에 의한 다짐토의 체적 팽창(부의 다일렌탄시)을 geosynthetics에 의해 구속 억제하는 과정에서 생성되는 효과로 생각한다. 먼저, 실내실험을 위한 구제직인 방법으로서, geosynthetics의 보강효과를 정량직으로 파악하기 위하여 사질토를 다짐하여 공시체를 만들어 그 주위에 geosynthetics를 설치하여 전체적으로 압축전단 시험을 실시하였다. 또한, 다짐토의 다짐도를 달리 하고 한 가지 종류만의 geosynthetics를 이용하여, 다짐토와 geosynthetics의 상호작용에 따른 압축력 변화, geosynthetics의 인장력 변화 및 공시체의 파괴 진행상황 등을 살펴보았다. 수치계산에서는 다짐토의 다일렌탄시 특성에 대하여 표현 가능한 탄소성 구성모델을 이용하였다. 또한, 탄소성 구성 모델에서의 항복 이전의 탄성영역의 거동을 묘사하기 위하여 Hashiguchi(1989)가 제안한 subloading surface의 개념을 도입하였고, 유한요소(FEM)해석을 통해 얻어진 결과들을 실내시험의 결과와 비교 분석하였으며, 그 결과 양자 양호한 결과를 얻었다.

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Geotechnical Characterization of Waste and Frictional Properties of Geosynthetics Interface (쓰레기의 공학적 특성과 토목섬유재간의 마찰 특성에 관한 연구)

  • 임학수;장연수;최정원
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.621-628
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    • 2003
  • To prevent the percolation of leachate through the bottom of waste landfills, the liner system of various layers, such as compacted clay, geomembrane, geonet, geotextiles, and geocomposite is designed. Since the friction angle between a geomembrane and other geosynthetics is usually lower than that of the soil alone, the interfaces between soil and geosynthetic or geosynthetic-geosynthetic may become a possible plane of weakness, which leads to potential instability of the system under load of waste at side slopes. In this study, large triaxial tests are carried out with samples of remoulded wastes and direct shear interface friction tests are carried out to understand the frictional properties of geosynthetic-geosynthetic interfaces, which are required for analyzing the safety of side-slope liner systems.

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Surface displacements due to tunneling in granular soils in presence and absence of geosynthetic layer under footings

  • Rebello, Nalini E.;Shivashankar, R.;Sastry, Vedala R.
    • Geomechanics and Engineering
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    • v.15 no.2
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    • pp.739-744
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    • 2018
  • This paper presents the results of numerical modeling studies on the effect of displacements of tunneling in granular soils. Presence of building loads is considered, to find displacement generated at the surface on tunnel. Effect of varying eccentricities of building is simulated, to find influence of building on vertical and horizontal displacement. Studies were carried out in two cases of with and without a geosynthetic layer installed at the bottom of the footing. Results of analysis revealed, the presence of geosynthetic layer under footing, with building placed on centre line, reduced the surface displacements compared to displacement generated without geosynthetic layer. Presence of geosynthetic layer under footing had a dominant effect in reducing displacements in high storey structures. However, when the building was shifted to greater eccentricities from centre line, presence of geosynthetic layer, led to insignificant reduction of displacements on the centre line at the surface.

A study on the mechanical properties of geosynthetic interface (토목섬유 접촉면의 역학적 특성에 관한 연구)

  • Nam, Yong;Kim, Gwang-Ho;Im, Jong-Chul;Ju, In-Gon;Kwon, Jeong-Geun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2009.09a
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    • pp.1540-1549
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    • 2009
  • Shear properties of geosynthetic/geosynthetic and geosynthetic/soil were evaluated from direct shear tests. The type of geosynthetic is Velcro which is effective for geosynthetic interface and make up for the weakness of sandbag. In this study, the cohesion and the angle of internal friction of each interface was estimated. The test results showed that the cohesion and the angle of internal friction of the geosynthetics depended on the amount of normal stress, the type of the geosynthetics used, and combinations of the geosynthetics and soils. Finally, by comparing the apparent cohesion and the friction angle of the geosynthetics, the applicability to design was identified.

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An investigation into the effects of lime-stabilization on soil-geosynthetic interface behavior

  • Khadije Mahmoodi;Nazanin Mahbubi Motlagh;Ahmad-Reza Mahboubi Ardakani
    • Geomechanics and Engineering
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    • v.38 no.3
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    • pp.231-247
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    • 2024
  • The use of lime stabilization and geosynthetic reinforcement is a common approach to improve the performance of fine-grained soils in geotechnical applications. However, the impact of this combination on the soil-geosynthetic interaction remains unclear. This study addresses this gap by evaluating the interface efficiency and soil-geosynthetic interaction parameters of lime-stabilized clay (2%, 4%, 6%, and 8% lime content) reinforced with geotextile or geogrid using direct shear tests at various curing times (1, 7, 14, and 28 days). Additionally, machine learning algorithms (Support Vector Machine and Artificial Neural Network) were employed to predict soil shear strength. Findings revealed that lime stabilization significantly increased soil shear strength and interaction parameters, particularly at the optimal lime content (4%). Notably, stabilization improved the performance of soil-geogrid interfaces but had an adverse effect on soil-geotextile interfaces. Furthermore, machine learning algorithms effectively predicted soil shear strength, with sensitivity analysis highlighting lime percentage and geosynthetic type as the most significant influencing factors.

Numerical Study on the Effects of Geosynthetic Reinforcement on the Pile-supported Embankment (수치해석을 통한 성토지지말뚝에 대한 토목섬유 보강 효과 분석)

  • Lee, Su-Hyung
    • Journal of the Korean Society for Railway
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    • v.12 no.2
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    • pp.276-284
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    • 2009
  • Recently pile-supported embankments have emerged as an optimum method when the rapid construction and strict deformation of structures are required on soft soils. Especially geosynthetic-reinforced and pile-supported (GRPS) embankments are used worldwide as they can provide economic and effective solutions. However the load transfer mechanism in GRPS embankments is very complex, and not yet fully understood. Particularly the purpose and effect of geosynthetic inclusion are ambiguous and considered as an auxiliary measure assisting the arching effect of piles. Numerical parametric study using 3D finite element method has been conducted to investigate the effect of geosynthetic reinforcement on the load transfer mechanism of GRPS embankments. Numerical results suggested that as more stiffer geosynthetic is included, arching effect decreases considerably and the load concentration to the piles mostly caused by tension effect of geosynthetic. This finding is contradictory to the common understanding that geosynthetic inclusion only enhance the efficiency of load transfer. Consequently the design parameters determined from the numerical analyses are compared with those of three existing design methods. The problems of the existing methods are discussed.

Soil-structure interaction analysis of beams resting on multilayered geosynthetic-reinforced soil

  • Deb, Kousik
    • Interaction and multiscale mechanics
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    • v.5 no.4
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    • pp.369-383
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    • 2012
  • In this paper, soil-structure interaction analysis has been presented for beams resting on multilayered geosynthetic-reinforced granular fill-soft soil system. The soft soil and geosynthetic reinforcements are idealized as nonlinear springs and elastic membranes, respectively. The governing differential equations are solved by finite difference technique and the results are presented in non-dimensional form. It is observed from the study that use of geosynthetic reinforcement is not very effective for maximum settlement reduction in case of very rigid beam. Similarly the reinforcements are not effective for shear force reduction if the granular fill has very high shear modulus value. However, multilayered reinforced system is very effective for bending moment and differential settlement reduction.

Influence of inclusion of geosynthetic layer on response of combined footings on stone column reinforced earth beds

  • Maheshwari, Priti;Khatri, Shubha
    • Geomechanics and Engineering
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    • v.4 no.4
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    • pp.263-279
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    • 2012
  • The present paper deals with the analysis of combined footings resting on geosynthetic reinforced granular fill overlying stone column improved poor soil. An attempt has been made to study the influence of inclusion of geosynthetic layer on the deflection of the footing. The footing has been idealized as a beam having finite flexural rigidity. Granular fill layer has been represented by Pasternak shear layer and stone columns and poor soil have been represented by nonlinear Winkler springs. Nonlinear behavior of granular fill layer, stone columns and the poor soil has been considered by means of hyperbolic stress strain relationships. Governing differential equations for the soil-foundation system have been derived and solution has been obtained employing finite difference scheme by means of iterative Gauss Elimination method. Results of a detailed parametric study have been presented, for a footing supporting typically five columns, in non-dimensional form in respect of deflection with and without geosynthetic inclusion. Geosynthetic layer has been found to significantly reduce the deflection of the footing which has been quantified by means of parametric study.

Evaluations of a Seismic Performance of Geosynthetic-Reinforced Embankment Supporting Piles for a Ultra Soft Ground (침하 억제를 위하여 초연약지반에 설치된 섬유보강 성토지지말뚝의 내진성능 평가)

  • Lee, Il-Wha;Kang, Tae-Ho;Lee, Su-Hyung;Lee, Sung-Jin;Bang, Eui-Seok
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.918-927
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    • 2008
  • The problems associated with constructing high-speed concrete track embankments over soft compressible soil has lead to the development and/or extensive use of many of the ground improvement techniques used today. Drains, surcharge loading, and geosynthetic reinforcement, have all been used to solve the settlement and embankment stability issues associated with construction on soft soils. Geosynthetic-reinforced embankment supporting piles method consist of vertical columns that are designed to transfer the load of the embankment through the soft compressible soil layer to a firm foundation and one or more layers of geosynthetic reinforcement placed between the top of the columns and the bottom of the embankment. In the paper, the evaluations of a seismic performance of geosynthetic-reinforced embankment piles for a ultra soft ground during earthquake were studied. the equivalent linear analysis was performed by SHAKE for soft ground. A seismic performance analysis of Piles was performed by GROUP PILE and PLAXIS for geosynthetic-reinforced embankment piles. Guidelines is required for pile displacement during earthquake. Conclusions of the studies come up with a idea for soil stiffness, conditions of pile cap, pile length and span.

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Assessment of Geosynthetic Soilbag Method to Restore the Roadbed of Railway (철도노반 복구를 위한 토목섬유 Soilbag 공법의 적용성 평가)

  • Hwang, Seon-Keun;Koh, Tae-Hoon;Park, Sung-Hyun
    • Journal of the Korean Society of Hazard Mitigation
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    • v.4 no.1 s.12
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    • pp.65-75
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    • 2004
  • Roadbed failure due to the natural disaster may bring out social and economic damage such as the loss of life and property, the consumption of time and cost for recovery, and the delay of logistics in railway In this study, the method using geosynthetic soilbag was applied to rehabilitation of the railway roadbed which was failed by disaster. The full scale tests with the simulated train loading were performed in order to evaluate the static and dynamic performance at the railway roadbed using geosynthetic soilbag. The results of these tests were compared with unreinforced and reinforced cases with geosynthetic soilbag, respectively The data gathered by various measurement devices from these full scale tests would be useful to evaluate and understand the roadbed with geosynthetic soilbag. In conclusion, geosynthetic soilbag was evaluated as a permanent restoration method to reinforce the roadbed of railway.