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- W2078129552 startingPage "239" @default.
- W2078129552 abstract "연직배수재가 설치된 연약지반 상에 도로성토를 실시할 경우 연약지반에 측방유동이 발생될 지 여부를 예측할 수 있는 방법이 제안되었다. 이 측방유동예측법을 조사하기위해 연직배수공법을 적용하여 지반개량공사가 실시된 연약지반 상에 도로성토가 시공된 우리나라 서해안과 남해안 지역 연약지반에서 계측관리가 실시된 13개 현장 200개 측점의 현장계측자료를 수집 분석하였다. 수평배수재를 설치한 연약지반에서 수평변위와 사면안전율과의 관계를 조사할 경우는 연약지반의 지표면수평변위량 보다는 지중최대수평변위량을 적용하는 것이 바람직하였다. 성토사면의 사면안전율이 1.4 이상이면 대부분의 연약지반 최대수평변위는 50mm 이하로 발생되었고 사면안전율이 1.2 이하이면 대부분의 최대수평변위는 100mm 이상으로 발생되었다. 최대수평변위량이 50mm 이하로 발생하면 전단변형이 발생하지 않았으므로 측방유동이 발생할 우려가 없는 안전한 현장으로 판단된다. 반면에 최대수평변위량이 100mm 이상으로 크게 발생하는 현장에서는 전단파괴가 발생할 가능성이 있다고 판단된다. 이런 현장에서는 즉각 대책을 강구한 후 성토를 계속함이 바람직하다고 판단된다. 또한 연직배수재를 설치한 연약지반에서 안정수가 3.0이하이고 지지안전율이 1.7 이상이면 안전한 성토시공이 가능하며 안정수가 4.3 이상이고 지지안전율이 1.2 이하이면 연약지반에 전단변형의 발생은 물론이고 전단파괴의 가능성까지도 예상된다. Some methods were proposed to predict lateral flow due to embankments for road constructions on soft grounds, in which vertical drains were placed. In order to investigate the prediction methods of lateral flow, 200 field monitoring data for embankments in thirteen road construction sites at western and southern coastal areas of the Korean Peninsula were analyzed. For analyzing the relationship between the safety factor of embankment slope and the horizontal displacement in soft grounds where horizontal drain mats were placed, it was reliable to apply the maximum horizontal displacement in soft ground instead of the horizontal displacement at ground surface. The maximum horizontal displacement was developed less than 50mm in fields where the safety factor of slope was more than 1.4, while the one was developed more than 100mm in fields where the safety factor of slope was less than 1.2. In safe fields where the maximum horizontal displacement were developed within 50mm, lateral flow would not happen since shear deformation was not appeared. On the other hand, shear failure would happen in the fields where the maximum horizontal displacement were developed more than 100mm. In such fields, embankments might be continued after some appropriate countermeasures should be prepared. Safe embankments can be performed on soft grounds, in which the stability number is less than 3.0 and the safety factor for bearing is more than 1.7. However, if the stability number is more than 4.3 and the safety factor for bearing is less than 1.2, shear deformation would begin and even shear failure would happen." @default.
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- W2078129552 date "2012-11-15" @default.
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- W2078129552 title "Prediction of Lateral Flow due to Embankments for Road Construction on Soft Grounds with Vertical Drains" @default.
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- W2078129552 doi "https://doi.org/10.12652/ksce.2012.32.6c.239" @default.
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