• 제목/요약/키워드: Reinforced embankment

검색결과 102건 처리시간 0.022초

보강제체사면의 침투거동평가 (Evaluation of The Seepage Behavior for Reinforced Embankment)

  • 신방웅;안병철
    • 한국안전학회지
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    • 제15권1호
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    • pp.146-152
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    • 2000
  • To estimate the behavior of reinforced and unreinforced embankment constructed on a impermeable foundation ground, a laboratory model test was performed for two types of soils and water level increasing velocity of a flood period. The experiment models were constructed with slopes of water level is 1.25cm/min, 2.5cm/min each. From model test results, as the slope of reinforced and unreinforced embankment was the slower, the more seepage line rised. In the unreinforced embankment, the rising velocity of water level was the faster, the larger the embankment failure was. And the reinforced embankment with geotextile was the more safe than the unreinforced embankment for seepage force.

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Geotextile로 보강된 제체의 거동 (Behavior of a Geotextile Reinforced Embankment)

  • 신방웅;배우석;이종규;안병철
    • 한국지반환경공학회 논문집
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    • 제2권2호
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    • pp.51-58
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    • 2001
  • 본 연구에서는 보강제체와 무보강제체의 침투거동을 평가하기 위하여 실내모형실험을 실시하였다. 제체침투시험은 사면경사가 1:1.5, 1:2.0이고 수위상승속도가 1.25cm/min, 2.5cm/min, 수위는 15cm, 25cm, 35cm인 조건에서 실시하였다. 모형실험결과 보강재를 사용한 제체의 경우 지하수의 흐름과 상승 때문에 어느 정도의 침하와 수평방향변위가 발생하였으나, 무보강제체에서 나타난 커다란 활동파괴는 발생되지 않았다. 그리고 수위상승속도 변화에 따른 제체의 침투거동분석결과 Geotextile로 보강된 제체가 무보강제체보다 최종침하량이 감소하는 것으로 나타나 Geotextile을 설치한 제체가 비교적 물의 침투력에 대해 안정한 것으로 나타났다.

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A large-scale test of reinforced soil railway embankment with soilbag facing under dynamic loading

  • Liu, Huabei;Yang, Guangqing;Wang, He;Xiong, Baolin
    • Geomechanics and Engineering
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    • 제12권4호
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    • pp.579-593
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    • 2017
  • Geosynthetic reinforced soil retaining walls can be employed as railway embankments to carry large static and dynamic train loads, but very few studies can be found in the literature that investigate their dynamic behavior under simulated wheel loading. A large-scale dynamic test on a reinforced soil railway embankment was therefore carried out. The model embankment was 1.65 meter high and designed to have a soilbag facing. It was reinforced with HDPE geogrid layers at a vertical spacing of 0.3 m and a length of 2 m. The dynamic test consisted of 1.2 million cycles of harmonic dynamic loading with three different load levels and four different exciting frequencies. Before the dynamic loading test, a static test was also carried out to understand the general behavior of the embankment behavior. The study indicated the importance of loading frequency on the dynamic response of reinforced soil railway embankment. It also showed that toe resistance played a significant role in the dynamic behavior of the embankment. Some limitations of the test were also discussed.

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

  • 이일화;강태호;이수형;이성진;방의석
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 추계학술대회 논문집
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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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Numerical investigation of the effect of impact on the rockfall protective embankment reinforced with geogrid

  • Mohammad Reza Abroshan;Majid Noorian-Bidgoli
    • Geomechanics and Engineering
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    • 제33권4호
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    • pp.353-367
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    • 2023
  • The construction of a protective embankment is a suitable strategy to stop and control high-energy rock blocks' impacts during the rockfall phenomenon. In this paper, based on the discrete element numerical method, by modeling an existing embankment reinforced with geogrid, its stability status under the impact of a rock block with two types of low and high kinetic energy, namely 2402 and 4180 kJ, respectively, has been investigated. The modeling results show that the use of geogrid has caused the displacement in the front and back of the embankment to decrease by more than 30%. In this case, the reinforced embankment has stopped the rock block earlier. The displacements obtained from the DEM modeling are compared with the displacements measured from an actual practical experiment to evaluate the results' validity. Comparison between the results shows that the displacement values are close together, while the maximum percentage error in previous studies by an analytical method and the finite element method was 76.4% and 36.6%, respectively. Therefore, the obtained results indicate the discrete numerical method's high ability compared to other numerical and analytical methods to simulate and design the geogrid-reinforced soil embankment under natural disasters such as rockfall with a minor error.

성토지지말뚝공법 중 섬유보강재의 인장력 검토에 관한 연구 (A Study on the tension of Geogid on Pile-supported Construction Method)

  • 문인호;박종관;이일화
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 추계학술대회 논문집
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    • pp.905-917
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    • 2008
  • Road or Railway construction over soft ground is needed to be considered on secondary consolidation which will be caused differential settlement, lack of transport serviceability, higher maintenance cost. Especially for the railway construction in the second phase of Gyung-Bu or Ho-Nam high speed railway, concrete slab track has been adapted as a safe and cost effective geotechnical solution. In this case controlling the total settlement under the tolerance is essential. And pile supported geogrid reinforced construction method is suggested as a solution for the problem of the traditional method on soft soil treatments. Pile supported geogrid reinforced construction method consists of piles that are designed to transfer the load of the embankment through the compressible soil layer to a firm foundation. The load from the embankment must be effectively transferred to the piles to prevent punching of the piles through the embankment fill creating differential settlement at the surface of the embankment. The arrangement of the piles can create soil arching to carry the load of embankment to the piles. In order to minimize the number of piles geogrid reinforced pile supported construction method is being used on a regular basis. This method consists of one or more layers of geogrid reinforcement placed between the top of the piles and the bottom of the embankment. This paper presents several methods of pile supported geogrid reinforced construction and calculation results from the several methods and comparison of them.

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콘크리트 슬래브 궤도 흙쌓기 구간의 강화노반 두께에 관한 연구 (A Research on the Reinforced Roadbed Thickness of Concrete Slab Track on Embankment Section)

  • 신승진;신민호;박종관;이일화
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2007년도 추계학술대회 논문집
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    • pp.1242-1247
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    • 2007
  • An active application of concrete track is being expected for the future constructions of Korea railroad. For the successful construction and design in embankment section, the roadbed behavior should be reasonably estimated using the proper analysis method. In this research, behaviors of reinforced roadbed constructed with the determined stiffness and thickness at embankment section were estimated through various design parameters and numerical analysis. A three dimensional finite element method was employed to determine the proper reinforced roadbed thickness at embankment section. The displacement and vertical stress caused by train loading were estimated and compared with the field test results. The bearing characteristics of concrete track roadbed were presented. Moreover, the method to determine thickness of reinforced roadbed was proposed.

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한계평형법에 의한 연약지반 보강성토의 안정해석 (Stability Analysis of the Reinforced Embankment on Soft Foundations using the Limit Equilibrium Method)

  • 고남영;고홍석
    • 한국농공학회지
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    • 제37권5호
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    • pp.101-110
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    • 1995
  • The use of geotextile as reinforced materials in Soil structures has become widespread throughout the world. Geotextile reinforcement has been used in retaining walls, slope of embankment and especially soft foundation, etc. In the past, however, its design and construction have been performed empirically. In this study, to investigate of the effect of geotextiles reinforced slope of the embankment on a very soft foundation, a limit equilibrium analysis program calculating the safety factor of embankment on very soft foundation was developed. The study was focussed on such factors as type of geotextile, tensile strength, amount of reinforcement, and inclination of embankment. And the 4imit equilibrium analysis program was written on the basis of Low's slope stability theory with some modification. The following conclusions were drawn from this study. (1) The orientation of reinforcement can be assumed either horizontal or tangential to the slip circle. The factor of safety with tangential reinforcement is larger than that with the horizontal reinforcement. (2) In general, the factor of safety increases, as the slope reduces. However, it is preferable to use geotextiles with higher tensile strength rather than to reduce the slope of the embankment, because it is difficult to adjust the slope as desired. (3) The factor of safety obtained by numerical computation is affected only by the tensile strength, but not by the type of the geotextile.

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지오텍스타일로 보강된 농업용 저수지 제체의 붕괴거동 (Behavior of Failure of Agricultural Reservoirs Embankment Reinforced by Geotextile under Overtopping Condition)

  • 이달원;노재진
    • 한국농공학회논문집
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    • 제56권2호
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    • pp.59-64
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    • 2014
  • In this study, the large scale test was performed to investigate the behavior of failure for the embankment and spillway transitional zone by overtopping. The pore water pressure, earth pressure, settlement and failure pattern of covering embankment with geotextile were compared and analyzed. The pore water pressure showed a small change in the spillway transition zone and core, indicating that the geotextile efficiently reinforced the embankment. The earth pressure decreased the infiltration of the pore water only in inclined cores type to secure local stability. The behavior of failure started from the bottom and gradually progressed upwards. After the intermediate overtopping period (100 min), width and depth of the seepage erosion were very small due to the effect of geotextile which delayed failure. Therefore, the reinforced method by geotxtile was a very effective method to respond to the emergency due to overtopping.

Acceleration amplification characteristics of embankment reinforced with rubble mound

  • Jung-Won Yun;Jin-Tae Han;Jae-Kwang Ahn
    • Geomechanics and Engineering
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    • 제36권2호
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    • pp.157-166
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    • 2024
  • Generally, the rubble mound installed on the slope embankment of the open-type wharf is designed based on the impact of wave force, with no consideration for the impact of seismic force. Therefore, in this study, dynamic centrifuge model test results were analyzed to examine the acceleration amplification of embankment reinforced with rubble mound under seismic conditions. The experimental results show that when rubble mounds were installed on the ground surface of the embankment, acceleration response of embankment decreased by approximately 22%, and imbalance in ground settlement decreased significantly from eight to two times. Furthermore, based on the experimental results, one-dimensional site response (1DSR) analyses were conducted. The analysis results indicated that reinforcing the embankment with rubble mound can decrease the peak ground acceleration (PGA) and short period response (below 0.6 seconds) of the ground surface by approximately 28%. However, no significant impact on the long period response (above 0.6 seconds) was observed. Additionally, in ground with lower relative density, a significant decrease in response and wide range of reduced periods were observed. Considering that the reduced short period range corresponds to the critical periods in the design response spectrum, reinforcing the loose ground with rubble mound can effectively decrease the acceleration response of the ground surface.