Pit bearing capacity effect on status of soil plug during pile driving in ocean engineering |
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| Authors: | Shu-wang Yan Qun-hua Zhou Run Liu Wei Dong |
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| Institution: | (1) Insitute for Geotechnics and Construction Management, Hamburg University of Technology, Harburger Schlossstrasse 20, Hamburg, Germany |
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| Abstract: | Foundation piles of the offshore oil platforms in the Bohai Bay are usually longer than 100 m with a diameter larger than
2 m. Driving such long and large-sized piles into the ground is a difficult task. It needs a comprehensive consider ation
of the pile dimensions, soil properties and the hammer energy. Thoughtful drivability analysis has to be performed in the
design stage. It has been shown that judging whether the soil column inside the pile is fully plugged, which makes the pile
behave as close-ended, strongly influences the accuracy of drivability analysis. Engineering practice repeatedly indicates
that the current methods widely used for soil plug judgment often give incorrect results, leading the designers to make a
wrong decision. It has been found that this problem is caused by the ignorance of the bearing capacity provided by the soil
surrounding the pile. Based on the Terzaghi’s bearing capacity calculation method for deep foundation, a new approach for
judging soil plug status is put forward, in which the surcharge effect has been considered and the dynamic effect coefficient
is included. This approach has been applied to some practical engineering projects successfully, which may give more reasonable
results than the currently used method does. |
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| Keywords: | ocean platform pile pit bearing capacity plug status static equilibrium driveability |
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