• 한국지반신소재학회논문집
• /
• 제5권1호
• /
• pp.9-14
• /
• 2006

국내에서는 여러 가지 형상 및 친환경적인 보강토옹벽 구조물의 시공은 최근 많이 확대되고 있다. 전체구조물의 안정과 더불어 블록에 발생되는 균열은 대부분 원인으로 기초의 침하에 의한 경우가 많다. 본 연구에서는 기초지반의 부등침하와 관련하여 기초지지력의 설계시 평가법 및 시공시 평가법에 대하여 고찰하였다. 현장에서 실시되고 있는 실제 시공사례를 이용하여 보강토옹벽의 안정을 기초지지력을 만족하지 못하는 경우에 대한 대책방안을 제시하고 그 방안의 활용성을 제시하였다. 보강토옹벽의 기초부분은 전체사면의 잠재적 활동면의 범주내에 있게 되므로 기초지지력을 담당하는 지반은 지반의 활동저항력에 영향을 받게 된다. 따라서, 기초지지력을 부담하는 기초지반은 지지력에 대한 안정을 만족할 뿐 만 아니라 전체사면활동에 저항하는 억지능력에 대하여도 고려되어야 한다.

• 한국산학기술학회논문지
• /
• 제14권11호
• /
• pp.5923-5929
• /
• 2013

최근 국내에서도 구조물의 안정성을 향상시키고 수평토압의 크기를 줄여주는 선반식 옹벽에 대한 관심이 높아지고 있다. 이에 따라 모형시험 등 연구도 수행되기 시작했는데 기존 모형시험은 시험조건도 다양하지 않으며, 시험방법 등에서 개선해야 할 점이 있다. 이 연구에서는 개선된 모형시험 방법으로 여러 가지 다양한 조건에 대하여 모형시험을 수행하여 선반식 옹벽의 수평토압 감소효과를 확인하고자 하였다. 모형지반으로는 옹벽모형지반으로 일반적으로 많이 사용되는 주문진 모래를 이용하였으며, 1.2m의 모형옹벽을 15개 층으로 나누어 층마다 2개씩 총 30개의 로드셀을 사용하여 옹벽 높이별 수평토압을 측정하였다. 연구결과 선반식 옹벽은 캔틸레버식 옹벽에 비해 수평토압이 작게 발생하였으며, 선반 길이, 선반위치 등에 따라 수평토압의 크기가 영향을 받는 것으로 나타났다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2001년도 가을 학술발표회 논문집
• /
• pp.329-336
• /
• 2001

The numbers of geogrid-reinforced walls are widely used in Korea. This papers present the results of two failure case histories of geogrid-reinforced segmental retaining walls. The geological background of the construction sites, detailed construction sequences, and the amount of rainfall were examined. The failure of these reinforced walls are caused by the improper drainage system and foundation treatment, too sharpened curvature of corner work, and too high height of wall.

• 국제학술발표논문집
• /
• The 9th International Conference on Construction Engineering and Project Management
• /
• pp.1250-1251
• /
• 2022

Measuring management is an important part of preventing the collapse of retaining walls in advance by evaluating their stability with a variety of measuring instruments. The current work of measuring management requires considerable human and material resources since measurement companies need to install measuring instruments at various places on the retaining wall and visit the construction site to collect measurement data and evaluate the stability of the retaining wall. It was investigated that the applicability of the current work of measuring management is poor at small and medium-sized urban construction sites(excavation depth<10m) where measuring management is not essential. Therefore, the purpose of this study is to develop a laser sensor-based hardware to support the wall displacement measurements and their control software applicable to small and medium-sized urban construction sites. The 2D lidar sensor, which is more economical than a 3D laser scanner, is applied as element technology. Additionally, the hardware is mounted on the corner strut of the retaining wall, and it collects point cloud data of the retaining wall by rotating the 2D lidar sensor 360° through a servo motor. Point cloud data collected from the hardware can be transmitted through Wi-Fi to a displacement analysis device (notebook). The hardware control software is designed to control the 2D lidar sensor and servo motor in the displacement analysis device by remote access. The process of analyzing the displacement of a retaining wall using the developed hardware and software is as follows: the construction site manager uses the displacement analysis device to 1)collect the initial point cloud data, and after a certain period 2)comparative point cloud data is collected, and 3)the distance between the initial point and comparison point cloud data is calculated in order. As a result of performing an indoor experiment, the analyses show that a displacement of approximately 15 mm can be identified. In the future, the integrated system of the hardware designed here, and the displacement analysis software to be developed can be applied to small and medium-sized urban construction sites through several field experiments. Therefore, effective management of the displacement of the retaining wall is possible in comparison with the current measuring management work in terms of ease of installation, dismantlement, displacement measurement, and economic feasibility.

• 한국지반공학회지:지반
• /
• 제5권3호
• /
• pp.39-50
• /
• 1989

지진시 벽체의 관성력을 고려하여 소정의 미소변위를 허용하도록 설계된 옹벽의 신뢰도를 해석하는 방법을 연구하였다. FOSM 방법을 Richards and Elms의 model에 적용함으로써 책용적인 옹벽의 신뢰도해석이 가능하였다. 본 연구에서는 우선 지진시의 옹벽설계방법을 고찰하고, 그 다음에 신뢰도 해석방법의 개요를 FOSM을 중심으로 검토하였다. 마지막으로 실제 허용변랍를 인정하는 옹벽의 설계과정과 신뢰도 및 예민도 해석과정을 단계순으로 상세히 제시하여 실용에 편리하게 하였다.

• Structural Engineering and Mechanics
• /
• 제42권2호
• /
• pp.247-267
• /
• 2012

Calculating the displacements of retaining walls under seismic loads is a crucial part in optimum design of these structures and unfortunately the techniques based on active seismic pressure are not sufficient alone for an appropriate design of the wall. Using limit analysis concepts, the seismic displacements of retaining walls are studied in present research. In this regard, applying limit analysis method and upper bound theorem, a new procedure is proposed for calculating the yield acceleration, critical angle of failure wedge, and permanent displacements of retaining walls in seismic conditions for two failure mechanisms, namely sliding and sliding-rotational modes. Also, the effect of internal friction angle of soil, the friction angle between wall and soil, maximum acceleration of the earthquake and height of the wall all in the magnitude of seismic displacements has been investigated by the suggested method. Two sets of ground acceleration records related to near-field and far-field domains are employed in analyses and eventually the results obtained from the suggested method are compared with those from other techniques.

• 한국안전학회지
• /
• 제12권3호
• /
• pp.139-146
• /
• 1997

In this study, centrifugal model tests were performed to investigate the behavior of excavated earth retaining wall with the depth of excavation and different types of wall(aluminum, steel panel). Jumunjin standard sand was used for foundation soil. The raining method was adopted to form the required relative density of the model ground. The lateral earth pressure measured from tests were compared with estimated active earth pressure by Rankine's theory. The test results have shown that the earth pressure acting on the retaining wall and the rotation displacement of the wall are influenced by the depth of excavation and the type of wall. It was found from the test results that the deformation of the wall increases with the depth of excavation.

• 한국지반공학회지:지반
• /
• 제2권1호
• /
• pp.45-54
• /
• 1986

보강토잡벽에 대한 합리적인 설계 및 시공방법에 관한 경험적인 자료를 제홍하기 위하여 실내 모형실험이 실시되었다. 본 모형실험에서는 각 축조 단계에서의 보강재의 인장력 변화를 보강재상에 부착된 스트레인 게이지에 의하여 계측되었다. 또한 다이알게이지에 의하여 보강토파벽의 수평이동이 측정되었고, 도건의 붕괴형태가 조사되었다. 모형실험에서 측정된 값들은 보강토옹벽에 대한 기존 연구 결과와 비교.논의하였다. 본 모형실험의 중요한 결과는 보강재의 인장력이 벽면가까이에서 최대가 되어 비선형적으로 변화하며, 벽체에 연결된 보강재가 전류에 대한 안정성을 증가시킨다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
• /
• pp.167-170
• /
• 1999

Recently, it is often reported that many rivers are polluted with diverse swages etc. Concrete blocks for retaining wall and revetment is considered as one of the reasons that bring about water pollution, which is indicated by the grouops related to the conservation of environment. From the viewpoint of theoretical matters, although concrete blocks for retaining wall and revetment are know to have no relations to water pollution, it is required to measure the level of water pollution more accurately. Therefore, in this paper, analysis of water, which concrete blocks for retaining wall and revetment is put in for certain periods, are carried out in order to the level of water pollution.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2005년도 춘계 학술발표회 논문집
• /
• pp.1461-1467
• /
• 2005

In this study, a new earth retention system has been developed and introduced. This system is a self-supported earth retaining wall without struts. The new earth retention system consists of connected double H-pile and wale. This system provides a larger spacing of support, economical benefit, construction easiness, good performance and safety. This paper explains basic principles and mechanism of self-supported earth retaining wall. In order to investigate applicability and safety of this system, numerical analysis was performed. The finite differential method program, FLAC3D is used. The predicted performances of this system were presented and discussed.