A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Pullout Behaviors for Battered Large Diameter Reaction Piles during Static Pile Load Tests for Large Diameter Piles
Pullout behavior of large-diameter steel pipe production piles (Diameter = 2,500 mm, Length = 38∼40 m), which were designed as compression piles but used as reaction (uplift) piles during a static compression load test of a pile (Diameter = 1,000 mm, Length = 40 m), were investigated. Steel pipe piles were driven 20 m into a marine deposit and weathered soil layer and then socketed by drilling 10m into underlying weathered and soft rock layers, following which the drilled sockets and pipe were filled with reinforced concrete. The steel pipe and concrete in the steel pipe zone and concrete and rebars in the socketed zone were heavily instrumented to measure strains in each zone. The pullout deformations of the reaction pile heads were measured with LVDTs. Over the course of the study, a maximum uplift deformation of 7 mm was measured in the heads of the reaction piles when loaded to 10 MN, and 1mm of residual uplift deflection was measured. In the reaction piles, about 83 % and about 12 % of the applied pullout load was transferred in the weathered rock layer and in the soft rock layer, respectively. Also, under an uplift force of 10 MN, developed shearing resistances in the weathered rock layer and soft rock layer were as large as 125.3 kPa and 61.8 kPa, respectively. Thus, the weathered rock layer, located above the less weathered soft rock, can be utilized as a resisting layer, in which substantial frictional force can be mobilized.
Pullout Behaviors for Battered Large Diameter Reaction Piles during Static Pile Load Tests for Large Diameter Piles
Pullout behavior of large-diameter steel pipe production piles (Diameter = 2,500 mm, Length = 38∼40 m), which were designed as compression piles but used as reaction (uplift) piles during a static compression load test of a pile (Diameter = 1,000 mm, Length = 40 m), were investigated. Steel pipe piles were driven 20 m into a marine deposit and weathered soil layer and then socketed by drilling 10m into underlying weathered and soft rock layers, following which the drilled sockets and pipe were filled with reinforced concrete. The steel pipe and concrete in the steel pipe zone and concrete and rebars in the socketed zone were heavily instrumented to measure strains in each zone. The pullout deformations of the reaction pile heads were measured with LVDTs. Over the course of the study, a maximum uplift deformation of 7 mm was measured in the heads of the reaction piles when loaded to 10 MN, and 1mm of residual uplift deflection was measured. In the reaction piles, about 83 % and about 12 % of the applied pullout load was transferred in the weathered rock layer and in the soft rock layer, respectively. Also, under an uplift force of 10 MN, developed shearing resistances in the weathered rock layer and soft rock layer were as large as 125.3 kPa and 61.8 kPa, respectively. Thus, the weathered rock layer, located above the less weathered soft rock, can be utilized as a resisting layer, in which substantial frictional force can be mobilized.
Pullout Behaviors for Battered Large Diameter Reaction Piles during Static Pile Load Tests for Large Diameter Piles
Choi, Yongkyu (author) / O'Neill, Michael W. (author) / Nam, Moon S. (author) / Chung, Changkyu (author) / Kim, Sangil (author)
International Deep Foundations Congress 2002 ; 2002 ; Orlando, Florida, United States
Deep Foundations 2002 ; 793-806
2002-02-01
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2002
Pile load tests of large diameter battered steel pipe piles constructed on the offshore area
| British Library Conference Proceedings | 2002
Toe Bearing Behaviors of Large Diameter Piles Estimated by Loading Tests of Small Diameter Piles
| British Library Online Contents | 1999
| Engineering Index Backfile | 1954
| TIBKAT | 1990