将BOTDA(Brillouin Optical Time Domain Analysis)分布式光纤监测技术应用于深基坑桩锚支护结构的变形监测中。在基坑开挖的过程中，对桩锚支护结构的型钢和预应力锚索进行长期监测，得到了型钢的挠度分布图以及预应力锚索的应力分布图。基于此，分析型钢和锚索受力变形状态，为基坑施工提供可靠参考依据。工程实践表明，基于BOTDA的分布式光纤传感技术具有连续性检测的优点，适合应用于基坑支护结构的变形监测。

BOTDA distributed optic fiber monitoring technology was used to monitor the deformation of pile and anchor supporting structure of deep foundation pit.Through long-term strain monitoring of H-steel and pre-stressed anchor of the supporting structure during the excavation process,the deflection distribution of H-steel and stress distribution of pre-stressed anchor were obtained.On this basis,the stress and deformation state of H-steel and pre-stressed anchor was analyzed,providing reliable reference for pit construction.Engineering practice shows that deformation monitoring for foundation pit's supporting structure using distributed optical fiber sensing technology based on BOTDA is feasible and has the advantage of continuous monitoring.