BOFDA分布式光纤监测技术及其在桩基测试中的应用

BOFDA distributed fiber optic sensing technique and its application in pile testing

布里渊光频域分析技术(Brillouin Optical Frequency Domain Analysis,BOFDA)是近年来在国际上研发成功的一种分布式光纤传感技术,该技术已经开始被广泛应用于结构体和工业设备等的温度和应变感测,而最新的分布式应变测试技术可达到20cm的空间分辨率和±2με的应变测试精度。文中首先介绍了BOFDA的工作原理以及技术验证,然后将该技术应用到钻孔灌注桩的桩身应变测量中,得到了桩身轴力及侧摩阻力的变化规律,并与钢筋应力计测得的桩身轴力数据做了对比,结果表明,BOFDA测试结果准确,可作为一种新型的桩基测试技术加以推广。

The Brillouin Optical Frequency Domain Analysis（ BOFDA） is a novel distributed optical fiber sensing technique successfully developed aboard. It has been widely applied to detect the temperature and strain of structures and industrial equipment. The latest BOFDA distributed strain measuring technique can realize the test results with 20 cm spatial resolution and ± 2με strain measuring precision. The basic principle and experimental results of BOFDA are described,and its strain measuring method has been firstly applied to the drilled pile load test. The changing rules of axial force and side friction are revealed,and the comparison with the data acquired by the steel stress gauges for the piles is done,and it is shown that the BOFDA is a very potential technique for the pile test.