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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。
The BOTDA (Brillouin Optical Time Domain Analysis) distributed optical fiber monitoring technology is applied to the deformation monitoring of pile-anchor supporting structure in deep excavation. During excavation of the foundation pit, long-term monitoring of the profile steel and prestressed anchor cable of the supporting structure of pile and anchor is carried out. The deflection distribution of the profile steel and the stress distribution diagram of the prestressed anchor cable are obtained. Based on this analysis of the deformation of the steel and anchor cable deformation state, provide a reliable reference for foundation pit construction. The engineering practice shows that the distributed optical fiber sensing technology based on BOTDA has the advantages of continuity detection and is suitable for the deformation monitoring of the foundation pit supporting structure.