연직배수공법이 적용된 연약지반 상에 도로성토로 인한 측방유동의 특성 = Characteristics of Lateral Flow due to Embankments for Road Construction on Soft Grounds Using Vertical Drain Methods

다국어 초록 (Multilingual Abstract)

Field monitoring data for embankments in thirteen road construction sites at coastal area of the Korean Peninsula were analyzed to investigate the characteristics of lateral flow in soft grounds, in which vertical drain methods were applied. First of all, the effect of the embankment scale on the lateral flow was investigated. The thicker soft soils and the lager relative embankment scale produced the more horizontal displacements in soft grounds. Especially, if thick soft grounds were placed, the relative embankment scale, which was given by the ratio of thickness of soft ground to the bottom width of embankments, became larger and in turn large horizontal displacement was produced. And also the higher filling velocity of embankments induced the more horizontal displacements in soft grounds. The other major factors effected on the lateral flow in soft ground were the thickness and undrained shear strength of soft grounds,the soil modulus and the stability number. The more maximum horizontal displacement was induced by the less undrained shear strength and soil modulus of soft grounds. Also the more stability number produced the more maximum horizontal displacement. When the shear deformation was not developed, the stability number was less than 3.0 and the safety factor of bearing was more than 1.7. However, if the stability number was more than 5.14 and the safety factor of bearing was less than 1.0, the unstable shear failure was developed in soft ground. 50mm can be recommended as a criterion of the allowable maximum horizontal displacement to prevent the shear deformation in soft ground, while 100mm can be recommended as a criterion of the allowable maximum horizontal displacement to prevent the shear failure in soft ground.

참고문헌 (Reference)

1 김재홍, "측방유동 영향을 받는 해안매립 연약지반속 지하매설관에 관한 연구" 중앙대학교 대학원 2011

2 홍원표, "연약지반의 측방유동으로 인하여 매설관에 작용하는 측방토압" 한국지반환경공학회 11 (11): 27-38, 2010

3 이광우, "연약지반 측방유동 억지를 위한 토목섬유 보강 성토지지말뚝시스템의 설계법" 중앙대학교 대학원 2006

4 홍원표, "수동말뚝" 이진문화사 1994

5 김정훈, "도로 성토로 인한 연약지반의 측방유동에 관한 연구" 제주대학교 대학원 2012

6 Tavenas, F., "The behaviour of embankments on soft clay foundation" 17 : 236-260, 1980

7 Hong, W. P., "Lateral soil movement induced by unsymmetrical surcharges on soft grounds in Korea" 135-154, 2005

8 Tavenas, F., "Lateral displacements in clay foundations under embankments" 16 : 532-550, 1979

9 Oteo, C. S., "Horizontally Loaded Piles Deformation Influence" 101-106, 1977

10 Tschebotarioff, G. P., "Foundations, retaining and earth structures" Mc Graw-Hill Kogakusha, Ltd. 400-410, 1973

11 Hong, W. P., "Evaluation of lateral movement of piled bridge abutment undergoing lateral soil movement in soft ground" 27 : 177-189, 2009

12 Leroueil, S., "Embankments on soft clays" Ellis Horwood 360-, 1990

13 Peck, R. B., "Deep Excavation and Tunneling in Soft Ground" 225-290, 1969

14 Marche, R., "Contrôle de la stabilité des remblais par la mesure des déplacements horizontaux" 11 (11): 182-201, 1974