• 기술발표회
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• 통권2006호
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• pp.162-171
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• 2006

Segmental Grid Retaining Wall is one of the segmental grid retaining walls using headers and stretchers to establish the framework of the wall In this method, grids formed by the intersection of headers and stretchers are generally filled with the gravel to maintain the weight of the wall Therefore, the construction can be carried out with higher speed and much economically when compared with the concrete retaining wall Furthermore, it has high drain capacity, and environmentally friendly aspects also have been pointed out because the possibility of the planting at the front of the wall However, in the segmental grid retaining wall method, the relative movement between the individual headers and stretchers was generally recognized, and stress redistribution in the gravel filling was also observed when subjected to the external loading and self-weight of filling Therefore, it has been thought that the distribution of the earth pressure in the segmental grid retaining wall system differ from that of the concrete retaining wall In this study, the surcharge tests using the scaled model segmental grid retaining wall was carried out to observe the distribution of the earth pressure in the segmental grid retaining wall The earth pressure was measured in the six specified height of wall, and the distribution of the pressure was analyzed. Furthermore, the earth pressure by computation or by the test using the concrete retaining wall was also considered to make comparison

• 한국환경과학회지
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• 제16권9호
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• pp.1099-1102
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• 2007

This paper presents eco-friendly planting method to overcome the problems of existing concrete retaining wall and gabion retaining wall, respectively, based on the examination on existing concrete and gabion retaining wall. Prior to doing this, proper design method was provided through pull out test. Planting method using gabion metal net and L shape green net retaining wall were compared and analyzed. According to this study, it is confirmed that reduction of construction period and economical profit in construction can be achieved by both manufacturing at the factory and self procurement at the job site as well as the use of metal net, which is applied as a substitution of existing strengthening material. For the effect of planting method, the use of L shape green net retaining wall shows superiority to environment-friendly gabion retaining wall in its ability to rootage and germination of the grass. The L shape green net retaining wall had excellent performance in helping rootage of grass and prevention of soil leakage, and even if raining period, remarkable damage of planting mat does not occur when planting mat is applied.

• Earthquakes and Structures
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• 제14권2호
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• pp.179-186
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• 2018

We present the accurate investigation the seismic behavior of the gravity retaining wall built near rock face based on numerical method. The retaining wall is a useful structure in geotechnical engineering, where the earthquake is a common phenomenon; therefore, the evaluation of the behavior of the retaining wall during an earthquake is essential. However, in all previous studies, the backfill behind the wall was usually approximated by a homogeneous region, while in contrast, in practice, in many cases retaining walls are used to support the soil pressure in, inhomogeneous, mountainous area. This suggests an accurate investigation of the problem, i.e., numerical analysis. The numerical results will be compared with some of recently proposed analytical methods to show the accuracy of the proposed method. We show that increasing the volume of the rock face yields decreasing the permanent horizontal displacement of the gravity retaining wall built near rock face. Besides, we see that the permanent horizontal displacement of the gravity retaining wall with homogenous backfill is more than permanent horizontal displacement of the gravity retaining wall case of the built near rock face in different frequency contents.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.895-898
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• 2008

본 연구는 최근 국내의 옹벽 및 교대의 신기술 특허 등록 동향을 조사하여 파악하며, 이들 신기술특허를 적절히 실제 옹벽 및 교대 공사에 적용하려는데 목적을 두고 있다. 본 연구에서 조사된 신기술옹벽으로는 PS강봉에 프리스트레스를 도입한 단면력 저감형 조립식 PC옹벽공법, Coupler-Tension 조립식 옹벽, 도로용 블록식 보강토옹벽, 균등침하를 유도할 수 있는 블록식 보강토옹벽이 있으며, 신기술 교대로는 시트파일을 이용한 교대의 시공공법, 일체식 복합교대 교량, 반 일체식 교대교량의 시공방법, 보강토 교대구조를 기술하였다.

• 한국환경과학회지
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• 제11권11호
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• pp.1183-1187
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• 2002

Existing retaining walls are usually made from only one cast form and any damage must be promptly repaired. However, when a part of a retaining wall is repaired, a gap can be created between the repaired and existing parts, along with an unpleasing visual effect. As such, the whole structure is often reconstructed, rather than repairing one part, resulting in construction waste and possible contamination of the environment. Accordingly, the current study proposes a construction method for a retaining wall that uses separate blocks to downsize of quantity of construction waste. In addition, by changing the color or modifying the block cover a more environmentally friendly retaining wall construction method is achieved.

• Geomechanics and Engineering
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• 제33권2호
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• pp.195-202
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• 2023

In this study, the ground settlement in backside of retaining wall and the behavior of the retaining wall were analyzed according to the method of groundwater drawdown due to excavation by using two-dimensional(2D) finite element analysis. Numerical analysis was performed by applying 1) fixed groundwater level, 2) constant groundwater drawdown, and 3) transient groundwater drawdown. In addition, the behavior of the retaining wall according to the initial groundwater level, ground conditions, and surcharge pressure in backside of retaining wall was evaluated. Based on the numerical analysis results, it was confirmed that when the groundwater level is at 0.1H from the ground surface (H: Excavation soil height), the wall displacement and ground settlement are not affected by the method of groundwater drawdown, regardless of soil conditions (dense or loose) and surcharge pressure. On the other hand, when the groundwater level is at 0.5H from the ground surface, the method of groundwater drawdown was found to have a significant effect on wall displacement and ground settlement. In this case, the difference in ground settlement presents by up to 4 times depending on the method of groundwater drawdown, and the surcharge load could increase the ground settlement by up to 1.5 times.

• 한국지반공학회논문집
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• 제29권4호
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• pp.33-44
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• 2013

Mononobe-Okabe (M-O) 이론은 현재 국내외에서 가장 일반적으로 사용되는 지진 시 옹벽에 작용하는 동적토압 산정 방법이다. M-O방법은 강체거동(Rigid Behavior)을 갖는 중력식 옹벽의 사질토 뒤채움 지반에 대하여 제안된 방식이지만 현재 여러 지반 조건 및 캔틸레버 형태의 옹벽에도 널리 적용되고 있다. M-O 방법은 지진 시 발생하는 뒤채움 지반의 관성력만을 고려하기 때문에 벽체의 관성력이 동적 토압에 미치는 영향을 고려하지 못하는 단점이 있다. 본 논문에서는 M-O 방법을 포함하여 지진 시 옹벽에 작용하는 동적토압을 산정하는 기존에 제안된 방법들의 이론적 배경 및 현재까지의 연구동향을 분석하였으며, 이를 통하여 지진 시 토압산정의 중요한 요소인 동적토압의 분포 및 작용점에 대한 합리적인 재평가가 필요함을 도출하였다. 역 T형 옹벽을 대상으로 동적원심모형실험을 수행하여 지진 시 옹벽에 작용하는 동적 토압을 M-O 이론과 모형 모델 거동과의 비교를 통하여 차이점을 평가하였다. 실험 결과, 지진 시 옹벽의 실제 거동은 M-O 방법의 가정과 달리 벽체의 관성력과 동적토압 사이에 위상차가 발생함을 알 수 있었다. 또한 벽체에서 주동방향으로 최대 휨 모멘트 발생 시 계측된 토압은 정적토압보다 감소하는 결과를 보였으며 이는 벽체 관성력이 원인인 것으로 판단된다.

• 한국구조물진단유지관리공학회 논문집
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• 제7권1호
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• pp.207-215
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• 2003

Developed is a new environment-friendly concrete-block retaining wall system. The conventional analysis methods are not directly applicable because the proposed concrete-block wall system is made of by interlocking the blocks with shear keys. Therefore, the shear analysis as well as stability analysis have been conducted to secure the safety of block-wall system. Overall slope stability analysis was also performed. An appropriate strengthening method was developed to ensure the safety when the block-wall system is relatively high. The method of analysis for strengthening the concrete-block wall system was also proposed. The proposed environment-friendly concrete block retaining wall system shows reasonable safety and can be a good construction method for retaining walls and river bank walls.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 사면안정학술발표회
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• pp.3.1-11
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• 2003

Recently the problems related to the failure of the retaining wall structure has become great concern since the damage to the properties and human losses have occurred in the rainy season. However, a detail guideline on safety inspection and appropriate diagnosis on the retaining wall structure have not yet proposed and therefore, the inspection process and results are mainly dependant upon the engineers. The objective of this study is to propose objective and quantitative evaluation method for the condition based on the damage shapes and material types. In this purpose, composing materials of retaining wall are divided Into concrete, gabion, stone and reinforced earth, and then the evaluation items and method are suggested on the basis of the materials and structural characteristics of the retaining wall.

• Geomechanics and Engineering
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• 제3권4호
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• pp.255-266
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• 2011

Knowledge of seismic earth pressure against rigid retaining wall is very important. Mononobe-Okabe method is commonly used, which considers pseudo-static approach. In this paper, the pseudo-dynamic method is used to compute the distribution of seismic earth pressure on a rigid cantilever retaining wall supporting dry cohesionless backfill. Planar rupture surface is considered in the analysis. Effect of various parameters like wall friction angle, soil friction angle, shear wave velocity, primary wave velocity, horizontal and vertical seismic accelerations on seismic earth pressure have been studied. Results are presented in terms of tabular and graphical non-dimensional form.