【摘要】 基于分布式光纤感测(DFOS)在大型工程结构监测方面的技术优势,将其应用于船闸水工结构的安全健康监测中,运用以布里渊光时域分析(BOTDA)和布拉格光纤光栅(FBG)应变感测技术对船闸闸首和闸室结构在施工中的应力、应变过程进行了监测;运用以光时域反射(OTDR)和拉曼散射光纤感测技术为原理的ROTDR系统对船闸闸首底板浇筑过程中混凝土水化热的释放进行了监测,并由此对应变监测结果进行了温度补偿。根据监测结果,综合分析了混凝土水化热释放过程和上部荷载双重作用下船闸闸首结构内部混凝土和钢筋的应力、应变过程,并验证了分布式光纤感测技术在船闸等大型水工结构施工安全监测中的可行性。更多还原

【Abstract】 Based on the technical advantages of the distributed fiber optic sensor( DFOS) in the aspect of structural monitoring of large-sized project,it is applied to the safety and health monitoring on the hydraulic structure of ship lock; in which the stressstrain process during the construction of both the head and the chamber of ship lock is monitored with the strain sensing techniques of Brillouin optical time domain analysis( BOTDA) and fiber Bragg grating( FBG),while the release of the concrete hydration heat during the concrete placement of the bottom slab of the lock head is monitored with Raman optical time domain reflectometer( ROTDR) that takes both the optical time domain reflectometer( OTDR) and the Raman scattering sensing technique as its working principle,and then a temperature compensation is thereout made for the strain monitoring result. In accordance with the monitoring result,the stress-strain process of the concrete and the reinforcement inside of the lock head structure under the double action of both the releasing process of the concrete hydration heat and the upper loading is comprehensively analyzed,furthermore,the feasibility of applying the distributed optical fiber sensing technology to the safety monitoring of the construction of the large-sized hydraulic structures,such as ship lock,etc. is demonstrated as well.更多还原