应用频率-初速法测试推算单桩承载力须解决的几个关键问题

Key Problems to Be Solved for Determining Pile Capacity by Frequency-Initial Velocity Method

本文对当前频率 -初速法应用中存在的一些问题阐述了作者的看法并着重探讨桩振初速度V0的计算方法、W0 的正确单位、如何使桩 -土体系明显震动、怎样从激振曲线中突出及分离出桩振曲线 ,从而获得正确的桩振频率f0 和首波峰 -峰值Ad、动静对比系数 βv

Some problems existed in the use of frequency initial velocity method are described herein, which mainly deals with the calculation of initial velocity V 0, the correct unit of drop hammer W 0 , the method of making pile vibrate conspicuously, disengaging the pile vibration curve from the composite ones and the selection of dynamic static comparative factor.