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Abstract Static load test results and measured settlement of foundation show that the shaft compression accounts for a considerable part of the total settlement of a super-long pile under designed working load；and the super-long pile works as an end-bearing friction pile under the maximum load. Side friction resistance of the super-long pile shaft gradually occurs from the top to down of soil layer. The measured data also indicate that the ultimate relative displacement between pile and soil for fully mobilizing side friction resistance is found to be 14–18 mm in sandy silt and 17–19 mm in silty clay，respectively；and the shaft resistance softening is observed when the pile-soil relative displacement is larger than the threshold of slip displacement. Furthermore，the settlement of pile-group foundation increases with the increasing load. The whole building settles down simultaneously and the settlement is small when the load is small(below the 5th floor)；the settlement of the core tube is larger than that of the outer parts as the load reaches a certain value(above the 30th floor). At the completion of this building，the differential settlement is small and the whole building deformation is compatible. It can be noted that the settlement ratio of pile group effect reaches a maximum value，and then slowly decreases with the increasing load at the pile head.
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Received: 19 March 2010
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2011, Vol. 30 
