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基于BOTDR的布里渊应变监测技术已在岩土工程领域得到了初步的应用,但一系列的试验及工程应用表明,不同类型的光缆得到的测试结果呈现较大的差别性,原因就是光纤护套效应。以BOTDR的光纤应变监测技术为基础,并通过精准定位(温度刺激)、应变测量范围(漂移量)及温度测量等一系列试验,对新型应变光缆、套装光缆以及铠装光缆的工程性能进行了对比试验研究,得到了光纤护套效应对巷道监测结果的影响,甄别了适用于不同工程应用的光缆类型,并保证监测结果与实际变形及温差变化的一致性。这些研究工作初步解决了使用BOTDR技术进行巷道应变监测的光缆选型的问题,为基于BOTDR的应变监测技术的工程应用提供了理论基础。
The Brillouin strain monitoring technology based on BOTDR has been initially applied in the field of geotechnical engineering. However, a series of tests and engineering applications show that the test results obtained by different types of optical fiber cables show great differences due to fiber protection Set of effects. Based on BOTDR’s optical fiber strain monitoring technology, and through a series of tests such as precise positioning (temperature stimulation), strain measurement range (drift) and temperature measurement, the engineering performance of new strain cables, packaged optical cables and armored optical cables Compared with the experimental study, the influence of the fiber sheathing effect on the tunnel monitoring results was obtained. The types of optical fiber cables suitable for different engineering applications were identified and the consistency between the monitoring results and the actual deformation and temperature difference was ensured. These researches have solved the problem of cable selection based on BOTDR technology and have provided a theoretical basis for engineering application of BOTDR-based strain monitoring technology.