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PHC—钢管组合桩是由PHC管桩和钢管桩拼接而成,下部钢管桩参与极限承载力设计,同时具备两种桩基的优点,在水利水运工程中得到越来越多的应用;但是PHC—钢管组合桩的轴向极限承载力的计算依据尚未得到系统研究。以PHC—钢管组合桩轴向静载实验为例,选用FLAC3D有限差分软件,通过建立接触面模拟桩土之间的接触关系,模拟分析了全程静载试验沉降过程,得到了PHC—钢管组合桩竖向位移场分布、试验桩极限承载力、试验桩桩身微应变。由此,讨论了PHC—钢管组合桩在在静载试验中的力学规律,为PHC—钢管组合桩极限承载力设计提供分析依据。
PHC-steel pipe composite piles are made by stitching PHC pipe piles and steel pipe piles. The lower steel pipe piles are involved in the design of ultimate bearing capacity, and have the advantages of two kinds of pile foundations. They are more and more used in water conservancy and hydropower projects. However, the calculation basis of the ultimate bearing capacity of PHC-steel pipe composite piles has not been systematically studied. Taking the axial static load experiment of PHC-steel pipe composite piles as an example, the finite element software FLAC3D was used to simulate and analyze the settlement process of the whole static load test by establishing the contact relationship between the contact surface and pile-soil. The PHC- Vertical displacement field distribution, ultimate bearing capacity of test pile, micro-strain of test pile. Therefore, the mechanical rules of PHC-steel-pipe composite piles in static load test are discussed, which provides the basis for the design of ultimate bearing capacity of PHC-steel pipe composite piles.