智能电力排管结构变形感知方法与应用

电力排管作为浅埋地下结构,其分布广,遍布于城市每条街道,易受到工程施工的影响,而传统监测技术难以实时捕捉到结构变形破坏过程,需要实现结构自感知。光纤传感技术是一种能够做到实时、长期、分布式、新型监测方法,其在智能结构自感知领域应用潜力广阔。通过一组模型实验,并对变形监测数据进行研究,得到电力排管的受力变形特性;分析光纤传感器所得的水平向应变与电力排管沉降变形之间的关系,提出了光纤沿电力排管结构埋设并首尾相接形成监测闭合环路的安装方法,并在现场试验中进行验证。实验结果证明了基于布里渊频域分析(BOFDA)的分布式光纤传感技术运用在电力排管变形监测中的准确性、可靠性和优越性。研究成果可用于运营期电力排管结构安全状态的分布式监测,实现结构变形自感知,为智能地下结构的应用打下良好基础。

Deformation Sensing Method and Application of Intelligent Duckbank Structure

Duct bank is a widely distributed and shallow buried underground structure. It can easily be affected by engineering construction and self-sensing duct bank is needed because traditional monitoring technique is not sufficient to catch the deformation and failure process of structure constantly. Distributed fiber optic sensing offers a number of advantages on intelligent structure including distributed monitoring, long distance, real-time monitoring, long-term stability, etc. The stress characteristics of the duct bank were got by a laboratory experiment and analysis of monitoring data. A distributed remote monitoring method based on Brillouin optical frequency domain analysis (BOFDA) technology for duct bank was expounded by analyzing the relationship between structure settlement and horizontal strain data measured by Optical fiber sensors and testified by a field test. The results show that the BOFDA distributed optical fiber sensing technology has obvious accuracy, reliability and advantages in terms of deformation self-sensing of operations duct bank and lays foundations for smart underground structure.