Asphalt pavement deformation monitoring system based on OFDR and use method

Abstract

The invention discloses an asphalt pavement deformation monitoring system based on OFDR and a use method. The asphalt pavement deformation monitoring system based on the OFDR comprises a strain sensing optical fiber, a temperature compensating optical fiber, an optical fiber data collection and transmission system, an optical fiber data processing and analysis system and a monitoring result display system. By adopting an S-shaped distributed sensing optical fiber on the surface of a geogrid and embedding the geogrid in the middle of an asphalt pavement, optical fiber data are collected and transmitted in real time by using a data acquisition instrument; and information, such as strain and temperature change, of the asphalt pavement is obtained by using the optical fiber data processing system and displayed by using a monitoring result display system. Compared with the prior art, the asphalt pavement deformation monitoring system based on the OFDR has the advantages of high sensitivity,high spatial resolution, large measuring accuracy, high anti-interference capability; the strain of the asphalt pavement can be monitored in real time to obtain the deformation development rule of the asphalt pavement in an expressway.

Description

technical field [0001] The invention relates to the field of geotechnical engineering monitoring, in particular to an OFDR (Optical Frequency Domain Reflectometer)-based asphalt pavement deformation monitoring system and usage method. Background technique [0002] With the rapid development of economy and society, municipal road construction is not only closely related to people's daily production and life, but also a construction project that benefits people's livelihood. Therefore, its quality has attracted the attention of all walks of life. The asphalt pavement itself has the advantages of wide and smooth road surface, convenient material collection, and simple process. At the same time, it also has certain defects, that is, it is prone to deformation, cracking, and rutting after being repeatedly rolled by vehicles for a long time. The deformation of asphalt pavement will not only affect driving comfort, but also directly affect traffic safety. How to realize the real-t...

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Problems solved by technology

[0003] At present, monitoring methods such as resistive strain gauges, crack width gauges, and laser detection are mainly used. These methods have the following shortcomings: (1) Most of them are point sensors, which can only collect limited data and are easy to miss. Effectively guarantee the effectiveness of monitoring, and cannot fully reflect the deformation characteristics of the monitored objects; (2) There is a lag in information feedback, which leads to errors in time, and the later data processing is not intelligent enough; (3) The layout of measuring points is cumbersome, and the survival rate of measuring points (4) The labor intensity is high, requiring the monitoring personnel to spend a lot of time to invest, and it is in a state of lack of automation; (5) The measurement accuracy of the instrument is low, and it is difficult to obtain subtle changes in the monitoring object

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