• Title, Summary, Keyword: 블록식 보강토 옹벽

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A Case Study of Hybrid Reinforced Geo-Structure using Reinforced Concrete Block and Slope (콘크리트 블록식 보강토 옹벽과 보강사면을 복합으로 이용한 보강토의 설계 및 시공사례 연구)

  • Kim, Young-Nam;Chae, Young-Su;Lee, Kang-Il
    • Journal of the Korean Geosynthetics Society
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    • v.4 no.4
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    • pp.47-56
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    • 2005
  • With the need of efficient site use retaining walls have frequently used. Of them dry cast modular block wall(MBW), in which geogrid and concrete block are used is getting popular because of its simplicity and economical efficiency of construction. However, since this method is based on the theory of earth pressure, sands with good quality should be used. In contrast, reinforced soil slope(RSS) that the slope is less than $70^{\circ}$ can use wider range of soil than MBW. A hybrid reinforced geo-structure might be a good alternative in view of overcoming difficulty obtaining soils with good quality as well as maximizing the efficiency of site use. This method is composed of reinforced block wall and reinforced soil slope. In this method, reinforced block wall is constructed up to a certain height vertically at ground boundary first. Reinforced soil slope is then constructed on the block wall subsequently. This paper introduces several technical points that should be taken into account in design and construction.

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Seismic Response of Soil-Reinforced Segmental Retaining Walls by Finite Element Analysis (유한요소해석에 의한 블록식 보강토 옹벽의 지진시 응답특성)

  • 유충식
    • Journal of the Korean Geotechnical Society
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    • v.17 no.4
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    • pp.15-25
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    • 2001
  • 본 고에서는 블록식 보강토 옹벽의 지진시 거동에 관한 유한요소해석 결과를 다루었다. 보강토 옹벽의 지진시 변위거동을 검토한 결과 벽체저부를 지점으로 하는 캔틸레버형태의 변위 거동을 보였으며 따라서 옹벽 상단부에서의 보강재 인장력 증가가 현저하게 나타나 벽체전반에 걸친 분포양상은 균등한 경향을 보였다. 한편, 지진하중으로 인한 증분유발인장력에 관하여 검토한 결과 기존의 보강토 옹벽 내진설계기준과 비교하여 정성.정량적인 측면에서 상당한 차이를 보였으며 내진설계기준이 전반적으로 과소평가 하는 것으로 나타났다. 아울러서, 내진설계측면에서 변위억제 방안에 관한 매개변수 연구결과 임의 조건에 있어서 최대의 보강효과를 나타내는 보강재 임계 강성과 포설길이가 존재하며 최적의 보강효과를 얻기 위해서는 이에 대한 종합적인 검토가 요구되는 것으로 나타났다. 본 고에서는 연구결과를 종합적으로 고찰하여 실무 적용관점에서의 주안점을 언급하였다.

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Measured Behavior of Full-Scale Soil-Reinforced Segmental Retaining Wall (계단식 형태의 블록식 보강토 옹벽의 거동특성)

  • Yoo, Chung-Sik;Jung, Hyuk-Sang
    • Journal of the Korean Geosynthetics Society
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    • v.2 no.1
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    • pp.15-25
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    • 2003
  • This paper presents the results of instrumentation of a two-level of soil-reinforced segmental retaining wall. Instrumentation items include the lateral wall displacements and the geogrid strains at several locations. The instrumentation is still long carried in order to examine long-term behavior. The result indicate that the upper wall has a significant effect on the behavior of the lower wall doubling the wall moved. The wall also exhibits significant post-construction movements that had ceased several months after the wall completed. The implication of the findings from this study was discussed in great detail.

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Behavior of a Geosynthetic Reinforced Two-tier Segmental Retaining Wall on a Yielding Foundation (압축성이 큰 지반 위에 시공되는 계단형 블록식 보강토 옹벽의 거동)

  • Yoo Chung-Sik;Jeon Han-Yong
    • Journal of the Korean Geotechnical Society
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    • v.21 no.7
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    • pp.21-29
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    • 2005
  • This paper presents the results of a numerical investigation on the behavior of a geosynthetic reinforced two-tier segmental retaining wall (GR-SRW) on a yielding foundation. A hypothetical 10 m high two tier GR-SRW to be constructed on an incompetent foundation containing a layer of relative soft soil deposit was considered. A verified finite-element procedure was employed to get insights into the effect of foundation yielding on the wall behavior including the wall deformation and the reinforcement load. It is shown that the effect of foundation yielding is to increase the wall deformation as well as the reinforcement load, thus influencing both the internal as well as the external stability of the wall. Practical implications of the findings obtained from this study are highlighted in this paper.

New Patent Technology for Retaining Wall and Bridge Abutment (옹벽 및 교대 신기술 특허)

  • Kim, Kyeong-Ho;Choi, Jung-Ho;An, Jung-Seng;Kim, Nak-Gyeom
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.895-898
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    • 2008
  • This research paper intends to investigate and review the new technology of patent registration trend for the most recent domestic retaining wall and bridge abutment, and to apply the technology appropriately to the actual retaining wall and bridge abutment construction. Investigated new technological patents for retaining wall include pre-fabricated PC retaining wall construction method that reduces section force with prestressed PS steel bars, pre-fabricated Coupler-Tension retaining wall, clay reinforced retaining wall block for road, earth reinforced retaining wall block that induces uniform settlement, and etc. Investigated new technologies for abutment are abutment construction method that uses sheet pile, monolithic bridge with complex abutments, construction method for abutment bridge, earth reinforced abutment structure and etc.

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Effect of Foundation Stiffness on Behavior of Soil-reinforced Segmental Retaining Walls (기초지반의 강성이 보강토 옹벽의 거동에 미치는 영향)

  • 유충식;김주석
    • Journal of the Korean Geotechnical Society
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    • v.18 no.4
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    • pp.7-19
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    • 2002
  • This paper presents the results of an investigation on the effect of foundation stiffness on the performance of soil-reinforced segmental retaining walls (SRWalls). Laboratory model tests were performed using a reduced-scale physical model to capture the fundamentals of the manner in which the foundation stiffness affects the behavior of SRWalls. A series of finite-element analyses were additionally performed on a prototype wall in order to supplement the findings from the model tests and to examine full-scale behavior of SRWalls encountered in the field. The results of the present investigation indicate that lateral wall displacements significantly increase with the decrease of the foundation stiffness. Also revealed is that the increase in wall displacements is likely to be caused by the rigid body movement of the reinforced soil mass with negligible internal deformation within the reinforced soil mass. The findings from this study support the current design approaches, in which the problem concerning the foundation condition are treated in the frame work of the external stability rather than the internal stability. The implications of the findings from this study to current design approaches are discussed in detail.

Behavior of Soil-reinforced Retaining Walls in Tiered Arrangement (계단식 보강토 옹벽의 거동 특성)

  • Yoo, Choong-Sik;Kim, Joo-Suk
    • Journal of the Korean Geotechnical Society
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    • v.18 no.3
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    • pp.61-72
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    • 2002
  • This paper presents the results of investigation on the behavior of soil-reinforced segmental retaining walls in tiered arrangement using the finite element method of analysis. 2D finite element analyses were performed on tiered walls with two levels of offset distance. Cases with equivalent surcharge as suggested by the NCMA design guideline were additionally analyzed in an attempt to confirm the appropriateness of the equivalent surcharge model adopted by NCMA. Deformation characteristics of a tiered wall with small offset distance suggest a compound mode of failure and support current design approaches requiring a global slope stability analysis for design. Also revealed is that the interaction between the upper and lower walls significantly affects not only the performance of the lower wall but also the upper wall, suggesting that the upper walls should also be designed with due consideration of the interaction.

A Study on the Characteristics of Behavior of Block-type Reinforced Earth Retaining Wall Considering Failure Surface (파괴면을 고려한 블록식 보강토 옹벽의 거동 특성 연구)

  • Yoon, Won-Sub;Park, Jun-Kyu;Chae, Young-Su
    • Journal of the Korean Geosynthetics Society
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    • v.15 no.3
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    • pp.13-26
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    • 2016
  • In this study, more economical than conventional reinforced soil retaining walls, we compared the behavior characteristic about the safety block type numerically for reinforced retaining wall. In this study, reinforced soil retaining wall, first, was integrated a wall putting shear key on the blocks. Second, construction reinforcement focused on the theoretical failure surface was satisfied with the stability of a retaining wall reinforced by a shear plane. when analyzing, element of using reinforcement was carried out a numerical analysis for the cable element and the strip element, and they were analyzed under the conditions according to the stiffener length, distance, with or without shear key. Analysis for the integration of the front wall was reinforced soil retaining walls by installing a larger displacement shear key confinement effect, if reinforced construction and reinforcement with 1 interval and 2 interval, the failure surface was bigger displacement constraints. Generating a deformation amount was smaller than the generation amount of deformation accrued during construction of AASHTO so that it was stable.

Behavior Characteristics of Railway Roadbed Retained by Geosynthetic Reinforced Segmental Wall Under Train Load (열차 하중 작용 시 블록식 보강토 옹벽으로 지지된 철도 노반의 거동)

  • Lee, Seong Hyeok;Choi, Chan Yong;Lee, Jin Wook
    • Journal of the Korean Society for Railway
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    • v.15 no.5
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    • pp.467-475
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    • 2012
  • Static and dynamic train load tests were conducted to evaluate the train load transfer mechanism in the roadbed which was retained by two types (fully and partially) of segmental retaining walls reinforced by geogrid. The test roadbed was 2.6m high, 5m wide, and 6m long. A combination of earth pressure gages, displacement transducers, and strain gages were placed in specific locations to measure the responses. Test results showed that the wall displacement pattern as well as the earth pressure for the fully reinforced retaining wall was different from those for the partially reinforced retaining wall. In the dynamic train load test, the strain in the upper part of the wall tended to decrease, and both the residual deformation and the rate of the deformation were significantly lower than those in the current design standard.

A Study on Stability and Economic feasibility according to Height on the MSE Wall with Pacing Panel (고속도로 도로부에 시공된 패널식 보강토 옹벽의 높이별 안전율과 경제성 검토)

  • Park, Min-Cheol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.5
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    • pp.54-63
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    • 2018
  • In this study, the stability and economic feasibility of a MSE (Mechanically stability earth) wall with a pre-cast concrete pacing panel was investigated for a standard section of highway. Based on the design criteria, the MSE walls of the panel type were designed considering the load conditions of the highway, such as the dead load of the concrete pavement, traffic load, and impact load of the barrier. The length of the ribbed metal strip was arranged at 0.9H according to the height of the MSE walls. Because the length of the reinforcement was set to 0.9H according to the height of the MSE wall, the external stability governed by the shape of the reinforced soil was not affected by the height increase. The factor of safety (FOS) for the bearing capacity was decreased drastically due to the increase in self-weight according to the height of the MSE wall. As a result of examining the internal stability according to the cohesive gravity method, the FOS of pullout was increased and the FOS of fracture was decreased. As the height of the MSEW wall increases, the horizontal earth pressure acting as an active force and the vertical earth pressure acting as a resistance force are increased together, so that the FOS of the pullout is increased. Because the long-term allowable tensile force of the ribbed metal strip is constant, the FOS of the fracture is decreased by only an increase in the horizontal earth pressure according to the height. The panel type MSE wall was more economical than the block type at all heights. Compared to the concrete retaining wall, it has excellent economic efficiency at a height of 5.0 m or more.