动力参数（频率－初速）法无损检测承压桩中的几个问题

SEVERAL QUESTIONS IN NONDESTRUCTIVE TESTING BEARING PRESSURE PILE BY POWER PARAMETER (FREQUENCY-INITIAL VELOCITY)METHOD

动力参数（频率－初速）法无损检测承压桩，当能正确使用时，其测试结果与静载试桩的误差有可能保持在５％以内。本文从测试仪器的选用、桩头处理粘贴的钢板、激振能量的选择、穿心锤的构造、调整系数Ｋｖ的确定等方面，说明了如何正确使用该法。

To nondestructively test bearing pressure pile sing dynamic parameter(frequency-initial velocity)method generaly the error of the testing results compared with the static load testing pile can keep less than 5%if operating properly.The paper explains how to use the methed correctly in view of the selection of testing imstrument,the plate steel of sticking management of pile head,the selection of hammar vibrate energy, the structure of piecing hammer,and adjustment coefficient Kv etc.