Visual Observation of the Pull-Out Failure Mode of Belled Type Pile in Sandy Soil and Its Evaluation
- Jung-goo Kang (Kyushu University) | Aramaki Shinji (Research and Development Kotobuki Sangyo) | Yasufuku Noriyuki (Kyushu University)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- FEM analysis, Half Model Test, Failure Mechanism, Sand Ground, Belled Type Pile
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- 11 since 2007
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Image analysis and numerical analysis were carried out to analyze the shape of the failure surface and the behavior of the ground due to uplift loading. Based on the result, the higher relative density provides higher uplift resistance and the highest uplift resistance force was confirmed under the condition of the pile tip inclination angle of 12 °. Moreover, behavior of the ground soil during the experiment can be monitored visually.
The pile foundation is a basic construction that is used to transfer a load of a structure to a ground soil or rock layer with good bearing capacity when a shallow foundation cannot be used due to insufficient bearing capacity against the load from the structure. Recently, due to the enlargement of the structure load, the utilization of small piles diameter is reaching the limit that causes the increasing of the penetration depth of pile. This condition can increase the environmental problems due to the pile driving process. In addition, special structures such as coastal structures, high chimneys and transmission towers, most of the loads are caused by the horizontal loads generated by wind loads, waves and earthquakes. As an alternative to solve this problem, previous researchers were studied about belled type pile method.
The belled type piles have similar characteristics to the ordinary piles. Therefore, it can be effectively used not only for compressive load but also for pull-out load, so it is widely used in the special structures. Previous researchers were studied about the pullout resistance characteristics of piles using experimental model tests, field tests and numerical analysis. Meyerhof (1959, 1968, 1973, 1976) suggested that the pullout resistance of the pile is occurred due to the frictional force between the pile and the soil, and proposed a formula for calculating the pullout resistance based on the limit friction theory. Das (1975, 1982) introduces the concept of limit depth of Meyerhof's theory and presents a laboratory through model experiments.
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