塑料套管混凝土桩低应变瞬态波传播特性研究

Research on propagation characteristics of low-strain transient wave of plastic tube cast-in-place concrete pile

介绍了低应变反射波法检测桩身结构完整性的基本原理,并对塑料套管混凝土桩(TC桩)的桩身完整性进行了现场检测。通过有限元模拟实际工程中的各种情况,研究了TC桩低应变瞬态波传播特性以及激振设备的合理选择。根据有限元计算结果,对TC桩采用低应变的现场测试进行了改进,提出TC桩低应变检测时注意的问题及改进措施。

The basic principle of low-strain reflection wave method to detect the pile integrity was introduced. The field inspection of the integrity of plastic tube cast-in-place concrete pile( TC pile) was conducted. According to all practical engineering situations simulated by finite element method,the propagation characteristics of low-strain transient wave of TC pile and the rational selection of vibration equipments were studied. Based on the results of finite limit calculation,the low-strain field testing of TC pile was improved. The attentions and improvement measures were proposed when employing low-strain method to detect the integrity of TC pile.