高应变测试法中弹限取值的研究及工程应用

Study and engineering application of quake in high-stain dynamic test

摘要:

为了掌握高应变动力测试单桩极限承载力中波形拟合法的应用,对波形拟合法中桩土模型参数弹限的取值进行研究.通过某地区现场动、静力试验,获得了桩侧土摩阻力和桩土相对位移数据,并对数据进行回归分析.结果表明,用双曲线拟合桩土间摩阻力与桩土间的相对位移关系是合适的,在此基础上,提出分层取弹限的方法,用此方法获得的弹限值应用在实际工程测试计算中,有效提高了高应变测试单桩极限承载力的精度.

Abstract:

In order to study application of waveform fitting method of high strain dynamic testing methods in testing vertical bearing capacity of single-egress analysising of the data of pile shaft resistance and corresponding pile-soil relative displacement.The analysis indicates that hyperbola can fit the relation of pile shaft resistance and the corresponding pile-soil relative displacement well.So a new method to gaining quake limit for stratified soil is designed.Applying the method to actual engineering,and achieved more reasonable results.