OO상수도 밸브실은 하부 PILE 미설치로 인하여 부등침하가 발생하였으며, 이로 인해 벽체 이격, 상부슬래브 균열, 배 관 접속부 파손 등이 발생하였다. 부등침하로 인한 밸브실 및 배관의 안전성 확보여부를 구조해석을 통해 확인하고 보 수·보강 공법을 제시하고자 한다.

According to this research, the buoyancy force safety review of the buried water pipeline is carried out to determine the safety. In addition, it suggests ways to use as basic data for establishing future maintenance strategy.

Many of the reservoir is surrounded by mountains, and many reservoirs slope are not receiving proper maintenance. The slopes of adjacent to the reservoir is the blind spot of the administration. Landslides in the reservoir had caused the destruction of the structure from wave and overtopping. In addition, this has a severe impact on the stability of the downstream portion. In this study, an infinite slope stability analysis utilizing the on-site investigation and SINMAP be performed for vulnerability analysis of the landslide of adjacent to the reservoir.

According to recent meterological disasters, social awareness for safety of infrastructure is heightened by increasing natural disasters such as Fukushima accident, landslide of Umyeon mountain. Also scale of landslide is increased in Korea but safety review of dam is insufficient. In this study, we reviewed data(reservoir capacity, type of dam, danger map of korea forest service, satellite pictures, geologic map, etc.) and conducted site investigation whose the area is the most dangerous. Based on the results, we choose the most dangerous dam and analysis site close examination, slope stability analysis, scale of debris flow, etc. As a result, we will conduct measures establish on reinforcement and final evaluation of landslide's hazard.

According to recent meterological disasters, social awareness for safety of infrastructure is heightened by increasing natural disasters such as Fukushima accident, landslide of Umyeon mountain. Also scale of landslide is increased in Korea but safety review of dam is insufficient. In this study, we reviewed data(reservoir capacity, type of dam, danger map of korea forest service, satellite pictures, geologic map, etc.) and conducted site investigation whose the area is the most dangerous. Based on the results, we choose the most dangerous dam and analysis site close examination, slope stability analysis, scale of debris flow, etc. As a result, we will conduct measures establish on reinforcement and final evaluation of landslide's hazard.

The riprap zone of rock-fill dam is consists of shale, mudstone. This riprap is treated with engineered materials tends stable. The angle of bedding planes lead is split along the thin shale properties. Depending on weather conditions, such as exposure to soil physical and chemical properties have to be unstable. The subsidence and the slope-sliding due to weathering of the riprap occurs. The influence of weathering was analyzed by visual surveys and quantitative material properties

This study was performed to decide weight of an objective evaluation factors so optimized for small reservoirs and reservoirs that operators may survey their status and identify relevant risk factors in a timely way. In this study, evaluation factors were determined based on the expert panel results followed by the brain storming process. The selected evaluation factors were implemented on the formulation of hierarchy and analytic hierarchy process (AHP) technique were used to determine weight factors based on the expert survey results. It is expected that the use of the proposed weight will contribute to the more systematic and efficient safety management of small reservoirs to prevent their failures.

The local displacement in the downstream of the embankment dam has been observed since the 2nd precise inspection was investigated. It appears that this displacement is caused by the differential settlement on the different properties of the zone during the construction. Therefore, using the advanced inspection method of the 3D scanning determines whether to proceed with the displacement. In this study, reviewing a field application and analyzing results of the 3D scanning method are drowned a conclusion for improvement in the inspection and maintenance method on the Rock-fill type embankment dam.

In this paper, it is estimated the causes of wooden crib wall through detailed diagnosis and analysis of a crib wall construction site. As a results, it is occurred the damage in the members of about 6% in a total locations and the 65.7% of the damaged header are concentrated in the lower part of crib wall. Therefore, it is analyzed causes of wooden crib wall depending on the setup position and the kinds of members. It is considered basically the members of various forms of distortion and the grain affecting.

The purpose of this paper is to improve the method for rear cavity inspection of cut-off wall at concrete faced rock-fill dam. To do this, we suggested that using impact echo wave, analysis of embeded instruments data, and numerical method to considering the expecting crack open failure behavior. We hope that improved methods were assist maintenance of concrete cut-off wall at concrete faced rock-fill dam.

The purpose of this paper is to introduce the stability assessment method for treated wood retaining wall (Timbacrib Wall) which is made from the embalming processed timber. Timbacrib Wall is conducted a variety of investigation ; examination, boring examination, electrical specific resistance test. etc and stability analysis of stress and strength. According to the survey results, Timbacrib wall is suggested appropriate reinforcement with Micro-Pile and Anchors.