宁波PTA项目试打PHC桩初打高应变动力监测研究

Supervision Study on PHC Piling of PTA Project in Ningbo Using PDA Method

宁波拟建的PTA(精对苯二甲酸)项目要求在场地有代表性的区域进行预应力高强混凝土管桩(PHC桩)试沉桩。为获取PHC桩在不同贯入深度时的承载力及桩身应力分布规律,并确定各种桩型的最佳入土深度,选择合适的打桩设备,拟定停锤标准,分析管桩的闭塞效应,在试沉桩过程中对部分指定的桩进行PDA高应变动力试验监测。

Pile - sinking testing of Pre - stress High - strength Concrete pile （or PHC） should be finished during the PTA project in Ningbo. In order to obtain the bearing capacity in different depth and stress distribution rule of PHC pile, Supervision study on some selected PHC piles have been discussed during pile- sinking construction. And also, a lots of useful parameters have been achieved by PDA high strain dynamic test supervision, such as the best soil depth of different pile types, selecting appropriate piling equipment, confirming stop - hammer standard, analyzing block effect, etc.