双速度法检测基桩完整性试验研究

基桩低应变测试法被广泛应用于测试桥梁基桩、打入桩和抗滑桩等的完整性。但是，桩顶非自由的情况测试就非常困难。此时可采用双速度法检测，此方法也适于测试已有建筑物下的基桩及基桩与上部结构相连且桩长未知的情况。通过16根有承台和无承台模型桩的单速度和双速度测试，取得766组数据进行分析，得出此方法完全可以应用于工程基桩检测中，对基桩完整性检测具有现实意义。

Experimental Study on Integrity Inspection of Foundation Pile by Double Speed Test

The low strain test method of foundation pile is applied to check the integrity of bridge foundation pile, driven pile and anti-sliding pile extensively, but the check is difficult to be carried out in case of restrained pile top. Then the double speed test could be used, which could be also applied in case of the foundation pile of existing building, the foundation pile being connected to upper structure, and the pile length unknown. Through single and double speed tests for 16 model piles with and without cap, 766 groups of data are obtained for analysis. As a result, it is proved that the method could be absolutely applied in engineering foundation pile inspection and has realistic meaning about the related integrity check.