管道悬空灾害的分布式光纤实时监测方法研究

Real-time Monitoring of the Free-span in Buried Pipelines Using Distributed Fiber Optic Sensors

管道悬空是较为常见的一种结构病害形式,随着悬空长度的不断增加将可能导致管道断裂,但是目前还缺乏管道悬空灾害的实时监测技术。根据管-土相互作用机理,提出了一种基于分布式光纤监测管道悬空状态的方法,并通过模型试验对方法的有效性进行验证。试验结果表明该方法能够实时监测管道任意位置的纵向应变,并且可以根据应变数据的分布特征准确识别管道悬空的发展变化情况。

Free-span commonly occurs in the buried pipelines because of the geotechnical hazards such as landslide, erosion and dune migration etc. The pipelines could be destroyed easily with the increase of the free-span length. The on-line monitoring techniques are still lacking for the free-spanning pipelines. According to the pipe-soil interaction mechanism, a distributed fiber optic sensor based method is proposed for real-timely monitoring the free-span in the pipelines. The experimental investigations were performed to validate the effectiveness of the presented method. The results indicate that the occurrence and developments of the free-span can be accurately identified by using of the distributed strain measurements.