基于BOTDA的深基坑桩锚支护结构变形监测

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。

Deformation Monitoring of Pile and Anchor Supporting Structure of Deep Foundation Pit Using BOTDA

BOTDA distributed optic fiber monitoring technology was used to monitor the deformation of pile and an-chor supporting structure of deep foundation pit.Through long-term strain monitoring of H-steel and pre-stressed an-chor of the supporting structure during the excavation process,the deflection distribution of H-steel and stress distri-bution 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 de-formation 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.