PHC钢管组合桩竖向荷载传递机理研究

文章编号：16721683（2016）01013607

Investigation of vertical load transfer mechanism for PHCsteel composite pile

HU Junwen1，ZOU Yuguang2，TANG Lei1，WANG Haijun1，GUAN Fuhai1

（1.Nanjing Hydraulic Research Institute，Nanjing 210024，China；

2.Harbor Construction Project of Zhenjiang，Zhenjiang 212004，China）

Abstract：PHCsteel composite pile，with corrosion resistance and good penetration properties，has been popularized in highpile wharf.However，there are always some difference of their diameter，modulus of elasticity and density between PHC pipe pile in the upper part and steel pipe pile in the lower part，and the load transfer of composite pile was significantly different in its upper and lower part.The traditional method can not be applied directly to calculate the vertical bearing capacity，thus the load transfer mechanisms were not investigated.Therefore，the design of composite pile lacked mechanism basis.Based on geological conditions of the Yangtze River region of Zhenjiang Yangzhong，and considering softening of soil，the contact characteristics of pilesoil and great settlement deformation，simulation test of vertical static loading of PHCsteel composite pile was conducted by using FLAC3D software，then the effect of “depth of joint”，“area of joint” on ultimate bearing capacity and the axial force and pile lateral friction resistance were analyzed.The results indicated that the PHCsteel composite pile which driven in Yangtze River region of Zhenjiang Yangzhong is endbearing friction pile；the area and depth of joint affects the ultimate bearing capacity and settlement value of unstable pile；the greater attenuation of axial force occurs in the joint；the pile lateral friction resistance changes intricately with increasing depth；the ultimate pile lateral friction resistance occurs in the joint.

Key words：PHC steel composite pile；FLAC3D；vertical static loading test；depth of joint；area of joint；axial force；pile lateral friction resistance

PHC钢管组合桩是由上部预应力高强度混凝土管桩（简称PHC管桩）与下部开口钢管桩组合拼接而成，其构成见图1，该桩型具有抗腐蚀、优良的贯入性能以及较低的后期维护费用等优点。

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