An Observation Method Based on Embedded Optical Fiber Subgrade Subsidence Observation Device

Abstract

The invention discloses an embedded optical fiber roadbed settlement observing apparatus, and an observation method thereof. The apparatus comprises fiber grating pressure sensing devices, fiber grating temperature sensing devices, a fiber grating demodulator, a terminal receiving device, a PVC tube, a nylon conduit and a PE protection tube. According to the observation method, the fiber grating pressure sensing devices and the nylon conduit are embedded in soil in advance, and thus, the apparatus overcomes the defect that traditional settlement observation instruments interfere in construction due to burying of the instruments in filling soil for a construction area. During construction and post-construction settlement monitoring of a roadbed, the settlement of one point in the roadbed is converted into changes in the reflection wavelengths of fiber gratings of the fiber grating pressure sensing devices along with soil settlement, so settlement observation means are improved; and the apparatus has the characteristics of simple measurement method, high measurement accuracy, capacity of measuring upheaval displacement and high efficiency.

Description

technical field [0001] The invention relates to an embedded optical fiber roadbed settlement observation device and an observation method, in particular to an embedded optical fiber roadbed settlement observation device and an observation method suitable for roadbed settlement monitoring, and belongs to the technical field of roadbed settlement monitoring. Background technique [0002] Modern transportation construction has particularly strict requirements on subgrade settlement. Not only does it require embankment stability, but it also has different requirements for post-construction settlement, uneven settlement, and road surface smoothness. too high issue. At present, due to the characteristics of high water content, high compressibility, poor permeability, large void ratio, low strength and high sensitivity of soft soil, there are still many problems in the construction of high-grade highways on soft soil foundations: first, the settlement of soft soil foundations and ...

AI Technical Summary

Problems solved by technology

[0002] Modern transportation construction has particularly strict requirements on subgrade settlement. Not only does it require embankment stability, but it also has different requirements for post-construction settlement, uneven settlement, and road surface smoothness. too high

At present, due to the characteristics of high water content, high compressibility, poor permeability, large void ratio, low strength and high sensitivity of soft soil, there are still many problems in the construction of high-grade highways on soft soil foundations: first, the settlement of soft soil foundations and the problem of excessive differential settlement; secondly, the stability problem in the process of roadbed filling

Although the existing settlement instrument has the characteristics of simple measurement method, high level of automatic measurement and high measurement accuracy, there are still complex systems, difficulties in on-site embedding, high cost, and the selection of reference points (fixed points) More difficult and other disadvantages

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