• Title/Summary/Keyword: embankment on soft ground

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Correlation between Lateral and Vertical Deformation of Soft Ground under Embankment (제방성토에 따른 연약지반의 측방변위와 연직변위의 상관관계 분석)

  • 정하익;진현식;김경호
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.357-364
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    • 2000
  • This paper starts with reviewing general patterns of deformation of the soft ground with by embankment. Correlation between lateral and vertical deformation of soft ground under embankment are analyzed and discussed by comparing the performance of the Yangsan test embankment on treated soft ground with vertical drains.

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A Study on Lateral Movement of Improved Soft Ground under Embankment (성토하부 개량된 연약지반의 측방이동에 관한 연구)

  • Hong, Won-Pyo;Han, Jung-Geun;Park, Jae-Seok;Kim, Young-Hwan
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.1094-1101
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    • 2005
  • The stability of embankment on the soft ground has included problems on stabilities of embanked body and soft soil, which related with vertical displacement and lateral movement of the soft ground especially. The judge methods for the potentialities of lateral movement have been used in order to stabilization assessment during and after construction of the embankment. In this study, the judge methods on the improved soft ground suggested, which compared with exist judge methods on lateral movement. It is due to recent trend using embanked structures on the soft ground most of improved.

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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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A Study on the Stability of Embankment on Soft Ground through Measure Control (계측관리를 통한 연약지반상 성토의 안정성에 대한 연구)

  • Park, Seong-Jae;Jo, Gyeong-Tae;Jeong, Gyeong-Hwan
    • Proceedings of the Korean Geotechical Society Conference
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    • 1995.06b
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    • pp.15-34
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    • 1995
  • The deformations of ground due to the embankment on the soft clay affect the stability of embankment. This study compares the result of Korea's measured values with foreign's results. And it examines the irregularity of the soil behavior depending on the characteristics of the ground, and the results can be used as the base data for studying the complex factors on the soft ground. Meanwhile, several problems of applying the conventional methods to the domestic field are also discussed. The purpose of the study is to aid the regulations concerning the safety of the embankment on the soft clay, Especially, consideration of depth of the soft ground, embankment height and stress history, etc. should be added to existing factors of correlation between the lateral displacement and the vertical displacement.

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Interpretation of Soft Ground Deformation under Embankment using the Electrical Resistivity Survey (전기비저항탐사를 이용한 성토하부 연약지반의 변형 해석)

  • Kim, Jae-Hong;Hong, Won-Pyo;Kim, Gyoo-Bum
    • The Journal of Engineering Geology
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    • v.21 no.2
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    • pp.117-124
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    • 2011
  • Soil deformations such as settlement, heaving and lateral flow have frequently happened on marine reclaimed soft grounds due to embankment filling or banking. The electrical resistivity survey was applied to investigate on ground surface such soil deformation without disturbance of ground. A test embankment was performed to assess soil deformation in marine reclaimed soft grounds, where was located at Sihwa area in western coast of Korean peninsula. The soft ground was composed of clayey sediments. After embankment filling, the boundary of soil deformation affected by the filling could be investigated with application of the electrical resistivity survey. The result of electric resistivity survey shows that the extent of deformation is about 5 m laterally to the southern direction of embankment and about 5~6 m vertically in depth, which is about 1-1.2 times of embankment height. This shows that the electric resistivity survey can be applied to interpret the ground deformation in a soft ground region.

The reviews and Proposals for field instrumentation and management in embankment construction on soft ground (연약지반상의 현장계측관리 실태와 개선방향 고찰(도로를 중심으로))

  • 정종홍;김홍종;김성환
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03c
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    • pp.70-77
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    • 2000
  • Field instrumentation has been important part of construction management in embankment on soft ground. Most of all, well organized plan, instrumentation, maintenance, analysis and feed-back to the construction procedure are the key to the successful construction. In this paper, We review problems of field instrumentation has been performed at road construction on soft ground. And then, several proposals to improve field instrumentation and management are suggested

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Experimental Study on Lateral Flow Behavior of Soft Ground due to Embankment (성토로 인한 연약지반의 측방유동 거동에 관한 실내모형실험)

  • You, Seung-Kyong;Kim, Jae-Hong
    • Journal of the Korean Geosynthetics Society
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    • v.10 no.1
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    • pp.43-51
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    • 2011
  • Pile-supported embankment is one of the reinforcing methods to minimize damage due to the severe subsidence and lateral flow when soft clay ground is supported with embankment. pile-supported embankment mainly penetrates soft ground into the bearing stratum in order to support surcharge load which minimizes the subsidence and lateral flow due to the surcharge load. The aim of this research is to review quantitatively reinforcing effect of pile-supported embankment which is installed in soft clay ground. From the model test, it reproduced the ground movement with regard to the non-reinforced and reinforcing embankment-pile and also analyzed stabilizing effects of lateral flow due to the pile-supported embankment. With regard to the case of installing pile-supported embankment, its were analyzed stabilizing effects of lateral flow in cases of quick-load and slow-load to make different surcharge load.

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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Model Tests on Deformation Behavior of Soft Ground Under Embankment (성토하부 연약지반의 변형거동에 관한 모형실험)

  • Lee, Kwang-Wu;Cho, Sam-Deok;Hong, Won-Pyo
    • Journal of the Korean Geotechnical Society
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    • v.25 no.5
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    • pp.17-28
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    • 2009
  • When embankments are constructed on soft clay deposit, unsymmetrical surcharges due to embankments may generate the excessive vertical settlement and lateral deformation of soft clay foundation. The excessive deformations in soft grounds cause not only stability problem of the embankment itself but also that of the adjacent structures. The objectives of this research are to study the deformational behavior of soft ground due to the embankment load with different loading and soil conditions. Five model tests are carried out with different test conditions. From the results of the model tests, it is concluded that the lateral displacement induced by the embankment load occurs in the range of two times of the embankment width from a toe. In addition, the relationship between loading rate, v, and the vertical settlement of the soft ground, ${\Delta}s$, and the lateral displacement at the toe of embankment, ${\Delta}y_m$, is investigated based on the model test results.

An analytical Study on the Influence length of SCP Method (측방이동 대책공법(SCP)의 영향범위 산정에 관한 해석적 연구)

  • Lee, Young-Keun;Park, Chun-Sik;Kim, Jong-Hwan
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09b
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    • pp.152-160
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    • 2010
  • In this study, cohesion of soft ground, soft ground depth and embankment height varying conditions, such as the impact of each condition after the calculation of the range, SCP was performed to evaluate the applicability of the method. Reinforcing effects of scope, and permit lateral movement of SCP 2D and 3D analysis of the program were calculated by the displacement ratio, the result follows. The height and depth of soft soil embankment with increasing and decreasing the cohesion tends to be affected were long range, SCP method applied by the finite element analysis Cu = 1.0tf/$m^2$, embankment height is 3.0m depth of soft soil can be applied in a less than 5.0m, and Cu = 3.0tf/$m^2$, embankment height, the soft soil depth is 3.0m 12.0m, Cu = 3.0tf/$m^2$, embankment height is 5.0m less than 7.0m depth of soft soil can be applied in was. And Cu = 5.0tf/$m^2$, embankment height is 3.0m below 15.0m depth rouge anti Floor, Cu = 3.0tf/$m^2$, embankment height of 5.0m 12.0m depth below the soft soil, Cu = 5.0tf/$m^2$, If the depth of soft soil embankment height of 7.0m and below 5.0m was applicable.

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