静压PHC管桩沉桩及静载现场试验测试方法探讨

Discussion on the method of field test for the pile driving and static load of jacked PHC pipe pile

对有关学者在静压PHC管桩沉桩和静载过程现场试验测试方法进行了归纳,对沉桩和静载过程桩身轴力、土压力及孔隙水压力现场试验测试分别进行了阐述,并提出了新的桩身轴力测试方法,论述了测试桩土界面土压力和孔隙水压力的必要性,总结了静压PHC管桩沉桩和静载过程桩身轴力、桩周土压力和孔隙水压力的近似结论,指出了精确测试桩身轴力、桩土界面土压力及孔隙水压力的难度,桩身径向压力影响下的真实桩身残余应力变化规律,修正有限元界面摩擦模型及参数均有待研究,提出了在足尺PHC管桩和模型管桩上安装多种测试元件的观点,并分别进行现场试验测试和室内桩土界面剪切试验.

The work of method of field test for the pile driving and static load of jacked PHC pipe pile is concluded.The field test of pile shaft force,earth pressure and pore water pressure for pile driving and static load are presented respectively.This paper puts forward a new test method of pile shaft force and the necessity of test on earth pressure.Pore water pressure of interface between pile and soil is discussed.The general approximation of the pile shaft force,earth pressure and pore water pressure of pile lateral for pile driving and static load are summarized.The difficulty of exact testing on pile shaft force,earth pressure and pore water pressure of interface between pile and soil is stated.Further study is needed in the change law of effect of radial pressureof pile on real residual stresses in pile and correction of finite element friction model and parameters.The view of installation of various testing element on full-scale PHC pipe pile and model pipe pile is presented,and field test and model shear test on interface between pile and soil is made.