Study on the Influence of Expanding and Shrinking Diameter on Bearing Performance of Cast-in-place Pile
Taking a super high-rise building project in Guangdong as an example,the finite element model was established by PLAXIS soft-ware to analyze the influence of expanding and shrinking diameter on the settlement amount and pile stress.The results show that the load-set-tlement curve under each soil layer increases rapidly at first and then slowly.The ultimate vertical displacement of pile in silt soil layer is 0.046 87 mm,which is 4.3%lower than that of normal pile.The ultimate vertical displacement of the enlarged pile in silty clay layer is 0.042 43 mm,which is reduced by 12.6%compared with normal pile.Soil layer has little effect on the ultimate vertical displacement of re-duced pile.The ultimate vertical displacement of enlarged pile in silty clay layer is 0.043 26 mm,which is 9.8%lower than that in silt layer.The stress value of the expanding part of pile decreases;The stress value at the reduced diameter of pile increases significantly,so the reduced diameter of pile should be strengthened.
Pile foundationCast-in-place pileExpanding and reducing diameterFinite element analysisLoad-carrying performance
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