Research on horizontal displacement monitoring of deep soil based on a distributed optical fibre sensor
Research on horizontal displacement monitoring of deep soil based on a distributed optical fibre sensor
复制标题
基于分布式光纤传感器的深层土体水平位移监测研究
DOI：
10.1080/09500340.2017.1382594
复制
发表时间：
2018-01-01
影响因子：
1.3
通讯作者：
Ma, Yuan
中科院分区：
文献类型：
--
作者：
Huang, Xiaodi;Wang, Yuan;Ma, Yuan
摘要传统的深层土体水平位移测量方法通常采用测斜仪分段测量，然后人工产生阅读，测量时间长，且往往含有误差，另外测斜仪的抗干扰性和长期稳定性较差。本文介绍了一种基于分布式光纤的水平位移监测技术。通过理论模型描述了应变与挠度的关系，并通过埋设在测斜管表面的电缆测量测斜管的应变分布，从而利用差分算法计算出测斜管的挠度，并将其视为深层土体的水平位移。基于分布式光纤传感器的深层土体水平位移监测技术，克服了传统测斜仪技术的不足，实现了自动化实时监测，并允许分布式测量。试验结果与预期的工程情况相似，并将由应变计算的挠度与测斜仪进行了比较。结果表明，分布式光纤传感器与测斜仪的相对误差小于8.0%，验证了分布式光纤监测土体水平位移的可行性以及理论模型和差分算法的合理性。在基坑工程和边坡工程中应用分布式光纤监测深层土体的水平位移，可以更准确地评价施工期工程的安全性。
Abstract The traditional measurement method for the horizontal displacement of deep soil usually uses an inclinometer for piecewise measurement and then generates an artificial reading, which takes a long time and often contains errors; in addition, the anti-jamming and long-term stability of the inclinometer is poor. In this paper, a technique for monitoring horizontal displacement based on distributed optical fibres is introduced. The relationship between the strain and the deflection was described by a theoretical model, and the strain distribution of the inclinometer tube was measured by the cables laid on its surface so that the deflection of the inclinometer tube could be calculated by the difference algorithm and regarded as the horizontal displacement of deep soil. The horizontal displacement monitoring technology of deep soil based on distributed optical fibre sensors developed in this paper not only overcame the shortcomings of traditional inclinometer technology to realize automatic real-time monitoring but also allowed for distributed measurement. The experiment was similar to the expected engineering situations, and the deflection calculated from the strain was compared with an inclinometer. The results demonstrated that the relative error between the distributed optical fibre sensors and the inclinometer was less than 8.0%, and the results also verified both the feasibility of using distributed optical fibre to monitor the horizontal displacement of soil as well as the rationality of the theoretical model and difference algorithm. The application of distributed optical fibre in monitoring the horizontal displacement of deep soil in the engineering of foundation pits and slopes can more accurately evaluate the safety of engineering during construction.