基于BOTDA的桩体水平位移分布式光纤监测技术

随着城市的发展,城市轨道交通建设成为城市发展中具有重要意义的工程项目。然而由于该项目本身具有高风险性,一旦发生破坏,将产生难以承担的后果,因此如何防止此类事故的发生是目前亟须解决的问题。利用布里渊散射光时域分析（BOTDA）技术,以厦门轨道交通3号线3标段为工程依托,对开挖地铁基坑的围护桩变形进行监测。针对桩体位移,利用材料力学推导水平位移计算公式,并与监测结果进行对比,以验证所提布设方案在基坑监测中的可靠性。

Distributed Optical Fiber Monitoring Technology for Pile Horizontal Displacement Based on BOTDA

With the development of the city, urban rail transit construction has become an important engineering project in urban development. However, because of the high risk of the project itself, once the damage occurs, it will have unbearable consequences.Therefore how to prevent the occurrence of such accidents become an urgent problem . Based on the 3bid section of Xiamen rail transit line 3, the deformation of retaining piles in subway foundation pit excavation is monitored by using Brillouin scattering optical time domain analysis (BOTDA). According to the pile displacement, the calculation formula of horizontal displacement is derived by using material mechanics, and compared with the monitoring results to verify the reliability of the proposed layout scheme in the foundation pit monitoring.