分布式光纤传感技术在桩基测试中的应用

Research on the Testing of Piles Based on Distributed Optical Fiber Monitoring Sensing Technique

布里渊光时域反射计(BOTDR)是近年来国际上研发成功的一项新型的分布式光电传感技术,该技术已开始广泛地应用于结构体的温度、应变、应力测试。本文介绍了将这一技术应用于PHC管桩和钻孔灌注桩试桩中桩身轴力分布、侧摩阻力分布及桩端阻力等测试的两个实例。实践表明:基于BOTDR光纤传感技术的桩基分布式测试技术是十分可行和有效的,它与传统的钢筋计、应变片等点式测试技术相比,具有分布式、抗干扰、长距离、耐久性强和协调性好等优点,其应用前景十分广阔。

The Brilliouin optical time domain reflectometer （BOTDR） is a newly developed measurement and monitoring technique, which utilizes Brilliouin spectroscopy and optical time domain reflectometer to measure strain and temperature generated in optical fibers and distributed in the longitudinal direction. In this thesis, two examples of certain the distribution of strain, axial force and side frictional resistance along piles the PHC and bored testing piles breed on BOTDR are displayed. The achievements demonstrate that the BOTDR is a feasible and powerful technique for the strain measurement and health diagnosis of the testing pile.