ABSTRACT

Accurate monitoring of concrete pavement support condition is critical for pavement maintenance. This paper proposed a novel support condition monitoring method using distributed optical fiber sensing (DOFS) technology. The DOFS-based method can precisely monitor the support condition on a larger scale. Single-mode optical fiber with a particular rubber encapsulation was applied as a compression sensor, measuring the interfacial compression status between the concrete pavement slab and the pavement base through a compression-to-strain transfer mechanism. Finite element analysis (FEA) and laboratory experiments were conducted to compression-to-strain transfer mechanism. It was revealed that the average compression-to-strain transfer efficiency reached over 1900 μϵ/mm. The design parameters of the compression sensor were also provided based on the FEA and experiment results. A quasi-distributed sensing system was developed to capture the two-dimensional support condition by connecting the sensors in a particular path. The sensing system's effectiveness was demonstrated by conducting full-scale tests and using the pressure-sensitive film (PSF) as a comparison. The test results showed a great deal of applicability for support condition monitoring under concrete pavement.

摘要

准确监测混凝土路面支撑状况对于路面维护至关重要。本文提出了一种利用分布式光纤传感（DOFS）技术的新型支撑状态监测方法。基于自由度的方法可以在更大范围内精确监测支撑条件。采用特殊橡胶封装的单模光纤作为压缩传感器，通过压缩-应变传递机制测量混凝土路面板与路面基层之间的界面压缩状态。对压缩应变传递机制进行了有限元分析 (FEA) 和实验室实验。结果表明，压缩到应变的平均传递效率达到了 1900  μϵ以上/毫米。基于有限元分析和实验结果，还提供了压缩传感器的设计参数。开发了一种准分布式传感系统，通过将传感器连接在特定路径中来捕获二维支撑条件。通过进行全面测试并使用压敏薄膜 (PSF) 作为比较，证明了传感系统的有效性。试验结果表明，混凝土路面下的支护状态监测具有很大的适用性。